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NEET UG BIOLOGY MCQ: PLANT GROWTH AND DEVELOPMENT
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The following experiment was performed to test the effect of auxin on the plant growth. Five
plant seedlings (all growing actively) were prepared as below; they were unilaterally
illuminated, and growth was measured after 10 days.
Treatments:
Plant A : Tip not removed, nothing applied
Plant B : Tip removed, nothing applied
Plant C : Tip removed, gelatin block with cytokinin was placed on the cut edge
Plant D : Tip removed gelatin block with auxin placed on the cut edge
Which of the following plants would show curvature after the above treatment?
plant seedlings (all growing actively) were prepared as below; they were unilaterally
illuminated, and growth was measured after 10 days.
Treatments:
Plant A : Tip not removed, nothing applied
Plant B : Tip removed, nothing applied
Plant C : Tip removed, gelatin block with cytokinin was placed on the cut edge
Plant D : Tip removed gelatin block with auxin placed on the cut edge
Which of the following plants would show curvature after the above treatment?
View answer and explanation
Correct option: B
A and D
The correct answer is B (A and D) because Plant A (intact tip) will curve due to natural auxin production and Plant D (tip removed, auxin applied) will curve due to the applied auxin.
More Questions from PLANT GROWTH AND DEVELOPMENT
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Assertion(A): Dedifferentiated cells can only undergo redifferentiation.
Reason(R): Cork and secondary phloem are the products of differentiation Plants follow …A… pathways in response to environment or phases of life to form different kind of structures. This ability is called …B… Complete the given statement with the correct combination of options Rapid and dramatic increase in shoot length is called Some plants were kept under 15 hours of daylight and 9 hours of night. They started producing flowers. However in some of them night was interrupted by a brief flash of light resulting in failure of flowering to take place. This plant is a- Which of the following statements are fals regarding ethephon?
(A) A source of ethylene.
(B) It is slowly absorbed and transported within the plant to release ethylene rapidly
(C) It causes reduced abscission in flowers anc fruits of cotton.
(D) Supresses the internode elongation in deep water rice plants. Heterophylly can be observed in
I. cotton
II. coriander
III. larkspur
Select the right option
Reason(R): Cork and secondary phloem are the products of differentiation Plants follow …A… pathways in response to environment or phases of life to form different kind of structures. This ability is called …B… Complete the given statement with the correct combination of options Rapid and dramatic increase in shoot length is called Some plants were kept under 15 hours of daylight and 9 hours of night. They started producing flowers. However in some of them night was interrupted by a brief flash of light resulting in failure of flowering to take place. This plant is a- Which of the following statements are fals regarding ethephon?
(A) A source of ethylene.
(B) It is slowly absorbed and transported within the plant to release ethylene rapidly
(C) It causes reduced abscission in flowers anc fruits of cotton.
(D) Supresses the internode elongation in deep water rice plants. Heterophylly can be observed in
I. cotton
II. coriander
III. larkspur
Select the right option