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NEET BIOLOGYPlant Growth and Development Easy

Question

The phenomenon which is influenced by auxin and also played a major role in its discovery is:

A

Phototropism

B

Root initiation

C

Gravitropism

D

Apical Dominance

Step-by-Step Solution

the discovery of auxins started with the observation of Charles Darwin and his son Francis Darwin. They observed that the coleoptiles of canary grass responded to unilateral illumination by growing towards the light source, a phenomenon known as phototropism. This series of experiments led to the conclusion that the tip of the coleoptile was the site of a transmittable influence (later identified as auxin) that caused the bending .

Exam Context & Concepts Covered

This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Plant Growth and Development . Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

BIOLOGYPlant Growth and Development phenomenoninfluencedplayeddiscovery

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Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production?

A.Abscisic Acid
B.Indole-3-butyric Acid
C.Gibberellic Acid
D.Zeatin
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Which one of the following growth regulators is known as the stress hormone?

A.Abscisic acid
B.Ethylene
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Which of the following growth regulators is an adenine derivative?

A.Auxin
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C.Ethylene
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A.Differentiation
B.Dedifferentiation
C.Redifferentiation
D.Secondary growth
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Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

A.Gibberellin
B.Ethylene
C.Abscisic acid
D.Cytokinin
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Which hormone is responsible for fruit ripening?

A.Ethylene
B.Auxin
C.Ethyl chloride
D.Cytokinin
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Coconut milk factor is:

A.An auxin
B.A gibberellin
C.Abscisic acid
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Match the following concerning the activity/function and the phytohormone involved: Column-I (Activity/Function) Column-II (Phytohormone) (a) Fruit ripening (i) Abscisic acid (b) Herbicide (ii) Ethylene (c) Bolting (iii) Auxin (d) Stress hormone (iv) Gibberellic acid

A.(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
B.(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
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