Asked/Added Questions From NCERT: Science

-Answered by Rohit Rajput On 28 June 2021:06:01:43 PM

-Answered by Rohit Rajput On 28 June 2021:05:52:10 PM

-Answered by Rohit Rajput On 28 June 2021:05:50:20 PM

-Answered by Rohit Rajput On 28 June 2021:05:40:51 PM

-Answered by Rohit Rajput On 28 June 2021:05:35:42 PM

-Answered by Rohit Rajput On 28 June 2021:05:31:05 PM

(ii) परिधीय तंत्रिका तंत्र |

-Answered by Rohit Rajput On 28 June 2021:05:27:49 PM

-Answered by Rohit Rajput On 28 June 2021:05:26:12 PM

-Answered by Rohit Rajput On 28 June 2021:05:23:54 PM

-Answered by Rohit Rajput On 28 June 2021:05:19:28 PM

-Answered by Rohit Rajput On 24 June 2021:05:52:37 PM

-Answered by Rohit Rajput On 24 June 2021:05:49:22 PM

 (i) कोशिकाय (ii) द्रुमिका (iii) तंत्रिकाक्ष |

-Answered by Rohit Rajput On 24 June 2021:05:46:24 PM

-Answered by Rohit Rajput On 24 June 2021:05:39:21 PM

 तंत्रिका तंत्र के अतिरिक्त शरीर मे नियंत्रण और समन्वय हार्मोन या अतःस्त्रावी तंत्र द्वारा होता है |

-Answered by Rohit Rajput On 24 June 2021:05:33:49 PM

अमीबा गर्म जल मे सिकुड कर ताप के प्रति अनुक्रिया प्रदर्शित करता है | 

-Answered by Rohit Rajput On 24 June 2021:05:29:02 PM

-Answered by Rohit Rajput On 24 June 2021:05:26:18 PM

 धातुओ के संक्षारण के करण संक्षारित सतह के निचे धातु का शेष हिस्सा संक्षारित होने से बछ जाता है |

-Answered by Rohit Rajput On 23 June 2021:06:23:14 PM

 पौधों के पुराने भाग जड़ और तने बहुत कम दिशा बदलते है जबकि नए भाग अधिक दिशा बदलते है | 

-Answered by Rohit Rajput On 21 June 2021:06:09:30 PM

 शरीर के प्रतेक भाग से आने वाली तंत्रिकाएँ आकार मेरुरज्जु में मिलती है जहाँ प्रतिवर्ती चाप बनता है| किसी संवेदना के प्रति अनुक्रिया की सुचना बाद में मस्तिष्क को देदी जाती ही जहाँ उसक पुनः विश्लेषण होता है| 

-Answered by Rohit Rajput On 21 June 2021:06:01:04 PM

 अगरबत्ती की गंध का पाता अग्रमास्तिश्क द्वारा लगाया जाता है | यह गंध की संवेदना के लिए अलग संवेदी केंद्र होता है जहा सुचना प्राप्त होती है |इस प्रकार हमे अगरबत्ती की गंध का पाता चलता है | 

-Answered by Rohit Rajput On 21 June 2021:05:53:29 PM

 अनुमस्तिष्क |

-Answered by Rohit Rajput On 21 June 2021:05:49:03 PM

 अन्तर्ग्रथन पर विद्युत तरंगो के रूप मे आने वाला तंत्रिका आवेक कुछ रसायन का स्त्रावण को प्रेरित करता है |ये रासायन अन्तर्ग्रथन को पार करके अगली तंत्रिका कोशिका मे सामान प्रकार का तंत्रिका आवेक उत्पन्न करते है |   

-Answered by Rohit Rajput On 21 June 2021:05:33:43 PM

 प्रतिवर्ती क्रिया अवचेनत मस्तिष्क की अवस्था मे मेरुरज्जु द्वारा सम्पादित होती है ,जबकि टहलना प्रमस्तिष्क के नियंत्रण मे सोच समझ कर की गई क्रिया है | 

-Answered by Rohit Rajput On 21 June 2021:05:18:37 PM

-Answered by Rohit Rajput On 19 June 2021:06:15:32 PM

 लोहा , कॉपर , एलुमिनियम , आदि |

-Answered by Rohit Rajput On 19 June 2021:06:11:23 PM

 सोडियम , पोटेशियम , मैग्नेशियम 

-Answered by Rohit Rajput On 19 June 2021:06:08:04 PM

 सिल्वर सल्फाइड (काले रंग की ) की परत के निर्माण के करण चाँदी की वस्तुएँ कुछ समय बाद काली पढ़ जाती है|

-Answered by Rohit Rajput On 19 June 2021:06:00:10 PM

 धातु एवं अधातु |

-Answered by Rohit Rajput On 19 June 2021:05:57:06 PM

 114 

-Answered by Rohit Rajput On 19 June 2021:05:55:49 PM

-Answered by Raj Kumar On 14 April 2021:12:02:59 PM

एक ही तत्त्व के ऐसे परमाणु जिसकी द्रव्यमान संख्या भिन्न - भिन्न एवं परमाणु संख्या एक सामान हो , उन्हे समस्थानिक कहते है | 

-Answered by Raj Kumar On 14 April 2021:12:49:42 PM

 जिन तत्वों के बाह्यतम कक्षा एवं बाह्यतम कक्षा  से पहले वाली कक्षा से अपूर्ण रूप से भरी हो उसे संक्रमण धातु या तत्व कहते है |

-Answered by Raj Kumar On 14 April 2021:12:59:45 PM

 18 समूह और 7 आवृत 

-Answered by Shruti Srivastva On 13 April 2021:12:55:56 PM

18 समूह के सभी तत्त्व 

-Answered by Shruti Srivastva On 13 April 2021:12:56:40 PM

 यदि तत्वों को उनके बढ़ते हुए परमाणु द्रव्यमान के क्रम मे रखा जाए तो प्रत्येक आठवाँ तत्व एवं प्रथम तत्व के समानता पायी जाती है | इसे न्युलैडस का अष्टक का नियम कहते है | 

-Answered by Raj Kumar On 14 April 2021:01:04:42 PM

-Answered by Raj Kumar On 12 April 2021:05:06:27 PM

" तत्वों के भौतिक एवं रासायनिक गुण उनके परमाणु संख्या के आवर्त फलन होते है |" इसे आधुनिक आवर्त सारणी नियम कहते है |

-Answered by Raj Kumar On 14 April 2021:01:12:58 PM

 (1) पारा को छोड़कर अन्य सभी धातुएँ सामान्य ताप पर ठोस अवस्था मे होती है |

 (2) धातुओ कि अपनी  विशेष चमक होती है |

 (3) ये ताप एवं विधुत कि सुचालक होती है |

 (4) ये अघातवर्ध्य तथा तन्य होती है |   

-Answered by Raj Kumar On 10 April 2021:04:23:02 PM

 आवर्त सारणी मे धातुओ को बायीं तरफ तथा मध्य मे रखा जाता है जबकि अधातुओ को दायी तरफ रखा गया है |

-Answered by Raj Kumar On 10 April 2021:04:23:22 PM

 यह सोने की शुद्धता आंकने कि इकाई है | इस इकाई मे 100% शुद्ध सोने को 24 कैरट कहते है |

-Answered by Raj Kumar On 10 April 2021:02:40:48 PM

सल्फाइड अयस्क को वायु की उपस्तिथि मे अधिक ताप पर गर्म करने पर यह ऑक्साइड मे परिवर्तित हो जाता है | इस प्रक्रिया को भर्जन कहते है | 

-Answered by Raj Kumar On 10 April 2021:04:09:07 PM

 चोट करने पर एक विशेष ध्वनि उत्पन्न करना सोनरता या सोनोरस (ध्वानिक) कहलाता है 

-Answered by Raj Kumar On 10 April 2021:04:16:14 PM

-Answered by Raj Kumar On 10 April 2021:04:04:54 PM

 वे तत्त्व जो प्राकर्तिक भुपप्प्ती पर प्राकर्तिक रूप से पाए जाते है 

-Answered by Shruti Srivastva On 13 April 2021:12:57:40 PM

संक्षारण - जब कोई धातु अपने आसपास अम्ल , नमी आदि के संपर्क मे आती है तब यह संक्षारित  होती है और इस प्रक्रिया को संक्षारण कहते है | 

संक्षारण की रोकथाम के उपाये - 

(i) तेल लगाकर                        (ii) पेंट लगाकर 

(iii) गंधकीकरन द्वारा                  (iv)वार्निश के उपयोग द्वारा 

-Answered by Raj Kumar On 14 April 2021:01:18:04 PM

 वह अभिक्रिया जिसमे दो या दो से अधिक अभिकारक मिलकर एकल उत्पाद का निर्माण करते है उसे संयुक्त अभिक्रिया कहते है 

-Answered by Raj Kumar On 10 April 2021:01:43:07 PM

 वे पदार्थ जो रासायनिक अभिक्रिया मे भाग लेते है , अभिकारक कहलाते है |

-Answered by Raj Kumar On 10 April 2021:01:47:15 PM

2HNO₃ + Ca (OH)₂ → Ca(NO₃)₂ +2H₂O

इसमें अभिकारक और उत्पाद के ओर के सभी परमाणुओं की संख्या समान है अत: यह संतुलित रासायनिक समीकरण है | 

-Answered by Master Mind On 10 April 2021:02:09:09 PM

 जब किसी रासयनिक अभिक्रिया को संकेतो अथवा सूत्रों के माध्यम से व्यक्त किया जाता है तो इसे समीकरण या रासायनिक समीकरण कहते है  

-Answered by Raj Kumar On 10 April 2021:01:34:30 PM

कोई शब्द् समीकरण अभिकारकों  के उत्पादों में परिवर्तन को इस के मध्य एक तीर के निशान द्वारा दर्शाता है शब्द समीकरण कहते हैं

-Answered by Raj Kumar On 10 April 2021:01:04:28 PM

 यदि अभिक्रिया के बाद एवं पहले समीकरण के दोनों और का द्रव्यमान बराबर नहीं होता है तो ऐसा समीकरण कंकाली रासायनिक समीकरण कहलाता है 

-Answered by Raj Kumar On 10 April 2021:12:58:33 PM

ब्रहमांड मे पदार्थ का प्रत्येक कण प्रत्येक दुसरे कण को अपनी ओर आकर्षित करता है | इस सर्वव्यापी आकर्षण बल को गुरुत्वाकर्षण बल कहते है 

-Answered by Raj Kumar On 09 April 2021:05:20:06 PM

रायफल का द्रव्यमान M = 4 kg 

गोली का द्रव्यमान m = 50 g = 0.050 kg 

गोली का प्रारंभिक वेग u = 0 ms^-1 

गोली की अंतिम वेग v = 35 ms^-1 

राइफल का प्रारंभिक वेग U = 0 ms^-1  

राइफल का प्रतिक्षेपित वेग V = ? 

गोली छूटने के पहले का संवेग = MU + mu 

                                  = 4 × 0  + 0.050 × 0

                                  = 0 kg ms^-1 

गोली छूटने के बाद का संवेग = MV + mv 

                                = 4 × V + 0.050 × 35 

                                = 4V + 1.750  kg ms^-1 

संवेग संरक्षण के नियम से 

गोली छूटने के बाद का संवेग  = गोली छूटने के पहले का संवेग

4V + 1.750 = 0 

4V = - 1.750 

V = - 1.7504 = - 0.4375 ms^-1  

-Answered by Master Mind On 30 September 2020:03:59:53 AM

-Answered by Master Mind On 30 September 2020:02:20:34 AM

-Answered by Master Mind On 30 September 2020:02:19:12 AM

-Answered by Master Mind On 30 September 2020:02:15:50 AM

-Answered by Master Mind On 30 September 2020:02:14:12 AM

सोनार (SONAR) शब्द का पूरा नाम Sound Navigation And Ranging  है |

सोनार एक युक्ति है। जिसमें जल में स्थित पिंडों की दूरी, दिशा, तथा चाल मापने के लिए पराध्वनि तरंगों का उपयोग किया जाता है। यह एक यंत्र है जिसमें एक प्रेषित्र तथा एक संसूचक होता है और इसे नाव या जहाज में लगाया जाता है। 

सोनार तकनीक का उपयोग: 

सोनार की तकनीक का उपयोग समुद्र की गहराई ज्ञात करने तथा जल के अंदर स्थित चट्टानो, घाटियों, पनडुब्बियों, हिमशैल, डुबे हुए जहाज आदि की जानकारी प्राप्त  करने के लिए किया जाता है।

-Answered by Master Mind On 30 September 2020:02:12:17 AM

धत्विक घटकों को प्रायः बड़े-बड़े भवनों, पुलों, मशीनों तथा वैज्ञानिक उपकरणों को बनाने के लिए उपयोग में लाया जाता है। धातु के ब्लॉकों में विद्यमान दरार या छिद्र जो बाहर से दिखाई नहीं देते, भवन या पुल की संरचना की मशबूती को कम कर देते हैं। पराध्वनि तरंगें धातु के ब्लॉक से गुजारी जाती हैं और प्रेषित तरंगों का पता लगाने के लिए संसूचकों का उपयोग किया जाता है। यदि थोड़ा-सा भी दोष होता है, तो पराध्वनि तरंगें परावर्तित हो जाती हैं जो दोष की उपस्थिति को दर्शाती है | 

-Answered by Master Mind On 30 September 2020:02:10:20 AM

ध्वनि का दीवारों से बारंबार परावर्तन जिसके कारण ध्वनि-निर्बंध होता है, अनुरणन कहलाता है | 

अनुरणन के कारण ध्वनि साफ नहीं सुनाई देती है सुनने में बाधा उत्पन्न होता है | अनुरणन अवांछनीय है इसे कम करने की आवश्यकता होती है | 

इसे निम्नलिखित तरीके से कम किया जा सकता है | 

(i) इसे कम करने के लिए भवनों में पर्दे लटकाये जाते हैं, ताकि ध्वनि का अवशोषण हो सके |

(ii) कमरे या सभागारों में श्रोताओं की उपस्थिति बढ़ाने से, इससे भी ध्वनि का अवशोषण होता है |  

(iii) इसे कम करने के लिए संपीडित फाइबर  बोर्ड, खुरदरे प्लास्टर आदि लगाया जाता है |

(iv) सीटों के पदार्थ सही चुनाव भी ध्वनि अवशोषक के रूप में कार्य करते हैं | 

-Answered by Master Mind On 30 September 2020:02:07:51 AM

चमगादड़ गहन अंधकार में अपने भोजन को खोजने के लिए उड़ते समय पराध्वनि तरंगें उत्सर्जित करता है तथा परावर्तन के पश्चात् इनका संसूचन करता है। चमगादड़ द्वारा उत्पन्न उच्च तारत्व के पराध्वनि स्पंद अवरोधें या कीटों से परावर्तित होकर चमगादड़ के कानों तक पहुँचते हैं । इन परावर्तित स्पंदों की प्रकृति से चमगादड़ को पता चलता है कि अवरोध् या कीट कहाँ पर है और यह किस प्रकार का है पता लगा लेते है और आसानी से अपने शिकार तक पहुँच जाते हैं | 

-Answered by Master Mind On 30 September 2020:02:06:49 AM

प्रतिध्वनि का समय t = 5 sec 

पानी में ध्वनि की चाल v = ? 

d = v × t2 

v × t = 2d 

v = 2dt 

पानी में ध्वनि की चाल = 2 × 36255 = 1450 ms^-1

-Answered by Master Mind On 30 September 2020:02:04:30 AM

-Answered by nisha sheikh On 22 August 2020:09:52:04 AM

-Answered by nisha sheikh On 22 August 2020:09:54:16 AM

Matter, material substance that constitutes the observable universe and, together with energy, forms the basis of all objective phenomena.

-Answered by Shruti Srivastva On 23 September 2020:05:34:26 PM

-Answered by Shruti Srivastva On 23 September 2020:05:35:38 PM

-Answered by Shruti Srivastva On 23 September 2020:05:36:05 PM

-Answered by Shruti Srivastva On 23 September 2020:05:36:51 PM

-Answered by Shruti Srivastva On 23 September 2020:05:37:06 PM

-Answered by Shruti Srivastva On 23 September 2020:05:37:19 PM

-Answered by Shruti Srivastva On 23 September 2020:05:39:49 PM

-Answered by Shruti Srivastva On 23 September 2020:05:40:20 PM

-Answered by Shruti Srivastva On 23 September 2020:05:40:36 PM

-Answered by Shruti Srivastva On 27 August 2020:06:01:03 PM

-Answered by Shruti Srivastva On 27 August 2020:06:01:27 PM

-Answered by Shruti Srivastva On 23 September 2020:05:41:39 PM

 concrete.

-Answered by Shruti Srivastva On 23 September 2020:05:41:55 PM

 oil and water. 

-Answered by Shruti Srivastva On 23 September 2020:05:42:35 PM

-Answered by Shruti Srivastva On 23 September 2020:05:43:19 PM

 sugar solution

-Answered by Shruti Srivastva On 23 September 2020:05:43:37 PM

-Answered by Shruti Srivastva On 23 September 2020:05:44:05 PM

heterogeneous

-Answered by Shruti Srivastva On 23 September 2020:05:44:49 PM

 yes.

-Answered by Shruti Srivastva On 23 September 2020:05:45:24 PM

 no

-Answered by Shruti Srivastva On 23 September 2020:05:45:44 PM

homegenous

-Answered by Shruti Srivastva On 23 September 2020:05:45:54 PM

-Answered by Shruti Srivastva On 23 September 2020:05:46:07 PM

-Answered by Shruti Srivastva On 23 September 2020:05:46:26 PM

-Answered by Shruti Srivastva On 23 September 2020:05:46:43 PM

-Answered by Shruti Srivastva On 23 September 2020:05:47:01 PM

-Answered by Shruti Srivastva On 23 September 2020:05:47:13 PM

-Answered by Shruti Srivastva On 23 September 2020:05:47:36 PM

-Answered by Shruti Srivastva On 23 September 2020:05:47:48 PM

-Answered by Shruti Srivastva On 23 September 2020:05:48:13 PM

-Answered by Shruti Srivastva On 23 September 2020:05:48:53 PM

-Answered by Shruti Srivastva On 23 September 2020:05:49:08 PM

-Answered by Shruti Srivastva On 23 September 2020:05:49:34 PM

-Answered by Shruti Srivastva On 23 September 2020:05:49:54 PM

-Answered by Shruti Srivastva On 23 September 2020:05:50:35 PM

-Answered by Shruti Srivastva On 23 September 2020:05:50:48 PM

-Answered by Shruti Srivastva On 23 September 2020:05:51:08 PM

-Answered by Shruti Srivastva On 23 September 2020:05:51:19 PM

 Ophigolossum

-Answered by Shruti Srivastva On 03 June 2020:11:56:19 AM

 Mymercetia 

-Answered by Shruti Srivastva On 03 June 2020:11:55:14 AM

 Mymercetia 

-Answered by Shruti Srivastva On 03 June 2020:11:53:29 AM

 When cell is about to divide.

-Answered by Shruti Srivastva On 03 June 2020:11:45:28 AM

 Ribonucleic acid 

-Answered by Shruti Srivastva On 03 June 2020:11:42:45 AM

-Answered by Shruti Srivastva On 23 September 2020:05:51:52 PM

 46

-Answered by Shruti Srivastva On 03 June 2020:11:36:28 AM

 Tea plantation required annual rainfall

-Answered by Shruti Srivastva On 03 June 2020:11:50:12 AM

 Rate of diffusion is a characteristics of matter based on movement of the particles. In occurs in all state of matter but it fastest in case of gases, followed by liquid and slowest in solids.

-Answered by Nishant Verma On 01 June 2020:02:49:13 PM

-Answered by Shruti Srivastva On 24 August 2020:05:06:34 PM

 When a living plant cell loses water through osmosis to there is shrinkage or contraction of the contents of the cell away from the cell wall. This phenomenon is known as plasmolysis.

-Answered by Nishant Verma On 26 May 2020:09:49:06 AM

 The flexibility of the cell membrane also enables to cell to engulf in food and other materials from its external environment. Such process is known as Endocytosis. 

-Answered by Nishant Verma On 26 May 2020:09:42:52 AM

Robert Hooke. 

-Answered by Shruti Srivastva On 24 August 2020:05:07:02 PM

 Oxygen < Water < Sugar.

-Answered by Nishant Verma On 26 May 2020:09:29:11 AM

-Answered by Shruti Srivastva On 24 August 2020:05:07:44 PM

 A liquid has a larger surface in a saucer. than in a cup thus it vaporates faster and cool faster in a saucer than in a cup. 

-Answered by Nishant Verma On 26 May 2020:09:15:49 AM

-Answered by Shruti Srivastva On 24 August 2020:05:08:23 PM

 The temperature remain constant during the change of state because by increasing the pressure and reducing the temperature.

-Answered by Nishant Verma On 26 May 2020:09:21:52 AM

-Answered by Shruti Srivastva On 24 August 2020:05:09:14 PM

-Answered by Shruti Srivastva On 24 August 2020:05:09:58 PM

-Answered by Shruti Srivastva On 24 August 2020:05:10:20 PM

The major five divisions in kingdom plantea are:-

1. Thallophyta.          2. Bryophyta.    3.Pteridophyta.         4. Gynosperms.  5. Angiosperms.

(i) whether the plant body has well differentiated, distinct components.

(ii) Whether the differentiated plant body has special tissue for the transport of water and other substances.

(iii) The ability to bear seeds

(iv) Whether the seeds are enclosed within fruits.

-Answered by Nishant Verma On 25 May 2020:01:47:10 PM

 We choose that characters which depends on the first characterstics and determines the rest variety. 

-Answered by Nishant Verma On 25 May 2020:01:45:32 PM

(i)502It makes the study of different kinds of organisms much easier.

(ii)It helps us understanding the evolution of organisms.

(iii)It tells relation among the various classes of organisms.

(iv)It helps in a development of other life science.

-Answered by Nishant Verma On 25 May 2020:01:41:53 PM

-Answered by Shruti Srivastva On 24 August 2020:05:11:03 PM

-Answered by Shruti Srivastva On 24 August 2020:05:11:33 PM

-Answered by Shruti Srivastva On 24 August 2020:05:12:06 PM

(i)Growth of a plant. 

(ii)Rusting of iron.

(iii)Cooking of food.

(iv)Digestion of food.

(v)Burning of candle.

-Answered by Nishant Verma On 25 May 2020:12:49:33 PM

Element: Sodium, Silver, Tin and silicon.

Compounds: Calcium Carbonate, Methane and C0_2. 

Mixtures: Soil, Sugar, Coal, Air, Soap and blood.

-Answered by Nishant Verma On 25 May 2020:12:33:08 PM

-Answered by Shruti Srivastva On 24 August 2020:05:13:01 PM

Sea water, air and soda water. 

-Answered by Shruti Srivastva On 24 August 2020:05:13:36 PM

(i) Ice          

(ii) Iron.        

(iii) Hydrochloric acid.        

(iv) Calcium oxide.      

(v) Mercury.

-Answered by Nishant Verma On 25 May 2020:09:19:22 AM

 Take a sample of colourless liquid and put on stove if it starts boiling exactly at 100° C then it is pure water.

-Answered by Nishant Verma On 25 May 2020:09:17:31 AM

 Homogenoeus Mixture - Soda, water, air, vinegar, filterated tea.

Hetrogeneous Mixture - Wood, soil, air.

-Answered by Nishant Verma On 25 May 2020:09:14:40 AM

 (i) Melting of butter in a pan is a physical changes.

(ii) Rusting of almirah is a physical changes.

(iii) dissolving to common salt in water is a physical changes.

(iv) Passing of electric current, through water and the water breaking down into hydrogen and oxygen gases is a chemical change s.

-Answered by Nishant Verma On 25 May 2020:08:56:40 AM

 The Crystallisation method is used to purify. 

-Answered by Nishant Verma On 25 May 2020:08:55:41 AM

(a) Homogenoeus mixture 

 (i) The mixture with has uniform composition and it's composition cann't be itendified separately is known as Homogenoeus mixture.

(ii) For example - sugar in water, salt in sulphur, water in alcohol etc.

(b) Hetrogeneous mixture

 (i) The mixture which has non - uniform  composition can be identified separately is known as hetrogeneous mixtures.

(ii) For example - sand and salt, sugar and salt, water in oil and etc.

-Answered by Nishant Verma On 25 May 2020:08:44:07 AM

 A material that is composed of only one type of particles is called pure substance. All the constituent particles of a pure substances have same chemical nature.

-Answered by Nishant Verma On 25 May 2020:08:31:26 AM

 First, water is taken has a solvent in a saucer pan. This water solvent is allowed to boil. During heating milk and tea leaves are added to the solvent in solutes. They perform a solution. Then the solution is powered through a strainer. The insoluble part of the solution remains on the strainer of residue. Suger added to the filterate, which dissolves in the filterate. The resulting solution is the required tea.

-Answered by Nishant Verma On 24 May 2020:08:49:48 PM

-Answered by Shruti Srivastva On 24 August 2020:05:15:54 PM

 Chromatography.

-Answered by Nishant Verma On 24 May 2020:10:02:42 PM

 Filtration.

-Answered by Nishant Verma On 24 May 2020:10:03:19 PM

 Sublimation.

-Answered by Nishant Verma On 24 May 2020:10:03:53 PM

 Evaporation.

-Answered by Nishant Verma On 24 May 2020:10:04:32 PM

 Ice at 273 k has less energy than water although both are at the same temperature water possesses the additional latent heat of fusion. Hence, at 273 k ice is more effective in cooling than water.

-Answered by Nishant Verma On 24 May 2020:11:10:10 AM

 (a)25° C = At 25°C Water is in the form of liquid.

 (b)0° C = Both solid and liquid State.

 (c)100° C = Both liquid and gas state.

-Answered by Nishant Verma On 24 May 2020:10:45:18 AM

 Gaseous particles in posses high speed and large spaces between them particles of perfume diffuses into these gaseous particles at a very fast rate and reach our nostrils. This enables us to smell the perfume from a distance.

-Answered by Nishant Verma On 24 May 2020:11:04:07 AM

 Naphthalene undergoes sublimation easily i.e, the change state of naphthalene from solid to gas. takes place easily. Thus, naphthalene balls disappear with time without having any solids.

-Answered by Nishant Verma On 24 May 2020:10:59:03 AM

 An iron is a solid at room temperature because the iron is melting point is higher than 50°C.

-Answered by Nishant Verma On 24 May 2020:10:50:19 AM

 At room temperature, water has no definite shape but have a volume that is, it occupies shape of the Container in which it is kept.

-Answered by Nishant Verma On 24 May 2020:10:34:26 AM

False feet.

-Answered by Shruti Srivastva On 23 May 2020:09:04:23 PM

 Eukaryotes.

-Answered by Shruti Srivastva On 23 May 2020:09:01:56 PM

 Prokaryotes.

-Answered by Shruti Srivastva On 23 May 2020:09:00:28 PM

 70s and 80s.

-Answered by Shruti Srivastva On 23 May 2020:08:59:14 PM

 Protein factory.

-Answered by Shruti Srivastva On 23 May 2020:08:57:35 PM

 Lipids, steroids, detoxifies toxins and stored calcium.

-Answered by Shruti Srivastva On 23 May 2020:08:54:41 PM

 Protein.

-Answered by Shruti Srivastva On 23 May 2020:08:52:58 PM

 Muscles.

-Answered by Shruti Srivastva On 23 May 2020:08:49:46 PM

 Pancreatic cells.

-Answered by Shruti Srivastva On 23 May 2020:08:48:25 PM

 There are two types of endoplasmic reticulum:

1. RER

2. SER

-Answered by Shruti Srivastva On 23 May 2020:08:46:15 PM

 Endoplasmic reticulum, Golgi, Lysosomes and vacoules.

-Answered by Shruti Srivastva On 23 May 2020:07:18:29 PM

 Make modify protien.

-Answered by Shruti Srivastva On 23 May 2020:07:16:45 PM

 Network of membranes organelles.

-Answered by Shruti Srivastva On 23 May 2020:07:14:35 PM

 Bacteria.

-Answered by Shruti Srivastva On 23 May 2020:07:11:57 PM

 Human beings.

-Answered by Shruti Srivastva On 23 May 2020:07:10:51 PM

 Nitrous husband

Sugar

Phosphate. 

-Answered by Shruti Srivastva On 23 May 2020:07:08:57 PM

 Ophigolossum.

-Answered by Shruti Srivastva On 23 May 2020:07:07:14 PM

-Answered by Shruti Srivastva On 23 May 2020:07:05:51 PM

 46

-Answered by Shruti Srivastva On 23 May 2020:07:04:28 PM

 46

-Answered by Shruti Srivastva On 23 May 2020:06:58:02 PM

 DNA and protein.

-Answered by Shruti Srivastva On 23 May 2020:06:56:07 PM

 1. Producing RNA.

2. Controlling Cell.

-Answered by Shruti Srivastva On 23 May 2020:06:53:25 PM

 Deoxyribonucleic.

-Answered by Shruti Srivastva On 23 May 2020:06:51:36 PM

 1831.

-Answered by Shruti Srivastva On 23 May 2020:06:48:19 PM

 Robert Brown. 

-Answered by Shruti Srivastva On 23 May 2020:06:45:51 PM

 1674

-Answered by Shruti Srivastva On 23 May 2020:06:43:52 PM

 Antoine van Leeuwehoek.

-Answered by Shruti Srivastva On 23 May 2020:06:41:56 PM

 Primitive microscope.

-Answered by Shruti Srivastva On 23 May 2020:06:39:54 PM

 Robert Hooke 

-Answered by Shruti Srivastva On 23 May 2020:06:37:04 PM

 Photosynthesis

-Answered by Nishant Verma On 23 May 2020:01:15:44 PM

 Sol: 573-273 

    = 300

-Answered by Master Purushottam On 16 May 2020:09:18:53 PM

 Sol: 300-273 = 27⁰c

-Answered by Master Purushottam On 16 May 2020:09:24:37 PM

 Atmosphere refraction 

-Answered by priyanshu kumar On 12 May 2020:08:39:51 PM

 Ptyalin or salivary amylass

-Answered by priyanshu kumar On 13 May 2020:10:44:10 AM

 Gane migration or gene flow from a population to a new area is known as genetic drift  

-Answered by priyanshu kumar On 13 May 2020:10:46:31 AM

 The inability of a spices to bread successfully with related spices due to geographical, behavioral, physiological, or genetic barriers or differences.

-Answered by Nishant Verma On 25 May 2020:02:00:21 PM

 Nature select the best trates in Spanish lading to the survival of fittes and evolution this phenomenon as a noun as natural selection

-Answered by priyanshu kumar On 13 May 2020:10:51:59 AM

 Neuron 

-Answered by priyanshu kumar On 13 May 2020:10:55:20 AM

 Cerebellum 

-Answered by priyanshu kumar On 13 May 2020:10:55:57 AM

 Pollutants aur substances that causes harmful change in the environment thereby producing adverese effects on leaving organisms 

-Answered by priyanshu kumar On 13 May 2020:10:58:10 AM

 Potassium  (k) is the most reactive metal

-Answered by priyanshu kumar On 13 May 2020:02:30:03 PM

 Chloroplasts is a green pigment present is leaves of plants which give green colour of leaves

-Answered by priyanshu kumar On 13 May 2020:02:47:19 PM

 Stamen is a reproductive part of plant.

-Answered by priyanshu kumar On 17 February 2020:02:49:27 PM

 Pistil is a reproductive part of plant.

-Answered by priyanshu kumar On 17 February 2020:02:49:40 PM

 Stamen and pistil.

-Answered by priyanshu kumar On 17 February 2020:02:49:57 PM

-Answered by priyanshu kumar On 17 February 2020:02:50:22 PM

-Answered by priyanshu kumar On 17 February 2020:02:50:33 PM

-Answered by Akki chauhan On 07 February 2020:09:42:12 AM

-Answered by priyanshu kumar On 17 February 2020:02:51:05 PM

-Answered by priyanshu kumar On 17 February 2020:02:51:34 PM

-Answered by priyanshu kumar On 17 February 2020:02:51:43 PM

-Answered by priyanshu kumar On 17 February 2020:02:51:53 PM

-Answered by priyanshu kumar On 17 February 2020:02:52:41 PM

 Amoeba- cell memebrane

Earthworm- outer covering (skin

-Answered by priyanshu kumar On 17 February 2020:02:53:17 PM

 Lenticles.

-Answered by priyanshu kumar On 17 February 2020:02:53:29 PM

 The process by which blood is cleared of metabolic wastes in case o kidney failure is called dialysis.

-Answered by priyanshu kumar On 17 February 2020:02:53:38 PM

-Answered by priyanshu kumar On 17 February 2020:02:53:48 PM

-Answered by priyanshu kumar On 17 February 2020:02:53:57 PM

-Answered by priyanshu kumar On 17 February 2020:02:55:00 PM

-Answered by A??k Pal On 15 January 2020:11:37:13 AM

-Answered by A??k Pal On 15 January 2020:11:37:21 AM

-Answered by A??k Pal On 15 January 2020:11:39:21 AM

-Answered by A??k Pal On 15 January 2020:11:39:30 AM

-Answered by A??k Pal On 15 January 2020:11:39:42 AM

-Answered by A??k Pal On 15 January 2020:11:39:48 AM

-Answered by A??k Pal On 15 January 2020:11:39:58 AM

-Answered by A??k Pal On 15 January 2020:11:40:09 AM

-Answered by A??k Pal On 15 January 2020:11:40:26 AM

-Answered by A??k Pal On 16 January 2020:11:03:07 AM

-Answered by A??k Pal On 16 January 2020:11:03:33 AM

 Infinity.

-Answered by A??k Pal On 16 January 2020:11:03:45 AM

1. Gene flow: occurs between population that are partly but not completely separated.

2. Genetic Drift: It is the random change in the frequency of allels in a population over successive generations.

4. Geographical isolation: It is caused by mountain ranges, rivers etc. geographical isolation leads to reproductive isolation due to which there is no low of genes between seprated groups of population.

-Answered by A??k Pal On 16 January 2020:11:03:56 AM

Evolution is the sequence of gradual changes which takes place in the primitive organisms, over million of years, in which new species are produced. 

-Answered by A??k Pal On 16 January 2020:11:04:41 AM

-Answered by priyanshu kumar On 15 January 2020:11:19:57 AM

 Carbon can link with carbon atoms by means o covalent bonds to form long chains, branched chains and closed ring compound. Carbon atom may be linked by single, dpouble, or triple bonds.

-Answered by A??k Pal On 16 January 2020:11:05:04 AM

-Answered by A??k Pal On 16 January 2020:11:05:14 AM

 Saponification is a process by which triglycerides are reacted with sodium or potassium hydroxide (lye) to produce glycerol and a fatty acid salt, called "soap." The triglycerides are most often animal fats or vegetable oils.

-Answered by priyanshu kumar On 15 January 2020:11:20:23 AM

There are two laws of refection:-

1st law of reflection

The angle of incidence is equal to the angle of reflection or l_i=l_r.

2nd law of reflection

The incident ray, the normal at the point of incidence and the reflected ray lie on the same plane. 

-Answered by Rohit Rajput On 29 December 2019:10:16:38 AM

 The electrode connected to the positive terminal of a cell or battery.

-Answered by priyanshu kumar On 15 January 2020:11:21:04 AM

Rafflesia Arnoldii 

-Answered by priyanshu kumar On 15 January 2020:11:21:13 AM

 The electrode connected to the negative terminal of a cell or battery.

-Answered by priyanshu kumar On 15 January 2020:11:21:37 AM

 LED and Magnetic Compass.

-Answered by priyanshu kumar On 15 January 2020:11:21:46 AM

 Noise pollution.

-Answered by priyanshu kumar On 23 December 2019:09:08:56 AM

 Air column.

-Answered by priyanshu kumar On 23 December 2019:09:09:08 AM

 Solid medium.

-Answered by priyanshu kumar On 23 December 2019:09:09:24 AM

 Decibel[dB]

-Answered by priyanshu kumar On 23 December 2019:09:09:35 AM

 Hazards.

-Answered by Rohit Rajput On 29 December 2019:10:19:23 AM

 1.4 million kilometres.

-Answered by priyanshu kumar On 23 December 2019:09:12:46 AM

 [2003 UB]

-Answered by Rohit Rajput On 29 December 2019:10:20:03 AM

 The clusters of stars in the constellation are called globular clusters.

-Answered by Rohit Rajput On 29 December 2019:10:20:13 AM