Biology · Plant Morphology
In terms of tropic movements, how are the roots of most plants characterized?
- 1Positively phototropic and positively geotropic
- 2Negatively hydrotropic and positively phototropic
- 3Negatively phototropic and positively geotropic✓
- 4Positively phototropic and negatively geotropic
Correct answer
Negatively phototropic and positively geotropic
Explanation
स्पष्टीकरण:
ऋणात्मक प्रकाशानुवर्ती (Negative Phototropic): पौधों की जड़ें प्रकाश की दिशा के विपरीत (नीचे की ओर मिट्टी में) वृद्धि करती हैं, इसलिए इन्हें ऋणात्मक प्रकाशानुवर्ती कहा जाता है।
धनात्मक गुरुत्वानुवर्ती (Positive Geotropic): जड़ें गुरुत्वाकर्षण बल की दिशा में यानी धरती के अंदर की ओर बढ़ती हैं, इसलिए इन्हें धनात्मक गुरुत्वानुवर्ती कहा जाता है।
अतः सही विकल्प
- (B) है।
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