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Question 9: What is the stimulus in : (a) phototropism? (b) ge
Biology by Lakhmir Singh
Biology

Class 10

Lakhmir Singh

Author:
Lakhmir Singh
Publisher:
S. Chand
Subject:
Science
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Question 9: What is the stimulus in : (a) phototropism? (b) geotropism? (c) chemotropism? (d) hydrotropism? (e) thigmotropism?

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Question 9: What is the stimulus in : (a) phototropism? (b) geotropism? (c) chemotropism? (d) hydrotropism? (e) thigmotropism?
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Text SolutionText solutionverified iconVerified

Answer: The stimulus in
(a) Phototropism: Light
(b) Geotropism: Gravity
(c) Chemotropism: Chemicals
(d) Hydrotropism: Water
(e) Thigmotropism: Touch
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Practice questions from Biology (Lakhmir Singh)

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Assertion (A): Phototropism is caused by auxin.
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7 आनुवंशिकता तथा जैव दिक पिछले अध्याय में आपने पदा है कि प्रत्येक जीव अलीगक या लौगक प्रजनन के द्वारा अपने जैसे संतानों की उत्पाति करते है। ये जीव मूल संरचना और आकार में अपने जनकों के समान ही होते है। इस प्रकार एक जीव के मूल लक्षण (पैतृ गुण) पोढ़ी-दर-पीद़ी संतानों में संचरित होते है, जिसके कारण जीवों के विभिन्न जातियों का अस्तित्व कायम रहता है। जैसे मटर के बीज से मटर का ही पौधा उत्पन्न होता है। कबूतर के अंडों से कबूतर के बच्चे ही उत्पन्न होते है, बिल्ली अपने ही समान बच्चों को जन्म देती है। यद्धाप सभी जीवों की मूल संरचना एवं उनके लक्षण अपने जनकों के समान ही होते हैं, फिर भी प्रत्येक जीव अपने ही जैसे जीवों से या अपने जनकों से कुछ भिन्न अवश्य होते हैं। जैसे सभी मनुष्यों की मूल संरचना एक ही जैसी होती है, परंतु समरूप यमज (identical twin) को छोड़कर इनमें आपस में कुछ भिन्नता अवश्य होती है। पृथ्वी विभिन्नताओं के प्रकार पर जीवों की उत्पत्ति (origin) तथा उनके क्रमिक विकास विभिन्नताएँ, दो प्रकार की होती हैं-जननिक (germinal)s (evolution) एक प्रमाणित तथ्य है। पृथ्वी पर जीवों में कायिक (somatic)। विविधता, उनके क्रमिक एवं निरंतर विकास (systematic and continuous evolution) के कारण ही है। इस अध्याय में आप आनुवंशिकता, लिंग-निर्धारण, जीवों के क्रम विकास के प्रमाण (germ cells) में होनेवाले परिवर्तन (जैसे इनके क्रोमोसोए तथा उनसे संबद्ध सिद्धांतों का अध्ययन करेंगे। संख्या या संरचना में परिवर्तन, जीन के गुणों में परिवर्तना : कारण होती हैं। ऐसी विभन्नताएँ एक पीढ़ी से दूसरी चीकी : वंशागत होती हैं। इस कारण से जननिक विभिल विभिन्नताएँ आनुवंश्रिक (genetic) विभन्नता भी कहलाती है। गय एक ही प्रकार के जनकों से उत्पन्न विभिन्न संतानों का विभिन्नताओं में से कुछ जन्म से प्रकट हो जाती हैं, की अवलोकन करने पर हम उनमें कुछ-न-कुछ अंतर निश्चित रूप आँखों एवं बालों का रंग तथा कुछ विभिन्नताएँ बाद में प्रकर से पाते हैं। जैसे - उनके रंग-रूप, शरीर के गठन, आवाज, होती हैं, जैसे शारीरिक गठन, शरीर की लंबाई इत्यादि। मानसिक क्षमता आदि में अंतर अवश्य दिखते हैं। एक ही कायिक विभिन्नता- ऐसी विभिन्नताएँ कई कारणों से ? प्रजाति के जीवों में दिखनेवाले ऐसे अंतर आनुवंशिक सकती हैं; जैसे जलवायु एवं वातावरण का प्रभाव, उपलं (genetic) अंतर या वातावरणीय दशाओं (environmental भोजन के प्रकार, अन्य उपस्थित जीवों के साथ पर्मय conditions) में अंतर के कारण होते हैं। एक ही जाति के व्यवहार इत्यादि। ऐसी विभिन्नताएँ क्रोमोसोम या जीन के गुण विभिन सदस्यों में पाए जानेवाले इन्हीं अंतरों को विभिन्नता में परिवर्तन के कारण नहीं होती हैं। अतः, ये एक पीढ़ी सा (variation) कहते हैं। अतः, विभिन्नता जीव के ऐसे गुण हैं दूसरी पीड़ी में वंशागत नहीं होती हैं। ऐसी विभिन्नाएँ जो से अपने जनकों अथवा अपनी ही जाति के अन्य उपार्जित (acquired) होती हैं। इसलिए, इनका जैव विकास : सतख्यों के उसी गुण के मूल स्वरूप से घिन्नता को दर्शाते हैं। महत्त्व नहीं होता है। 68
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Question Text
Question 9: What is the stimulus in : (a) phototropism? (b) geotropism? (c) chemotropism? (d) hydrotropism? (e) thigmotropism?
TopicControl and Coordination
SubjectScience
ClassClass 10
Answer TypeText solution:1
Upvotes96