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Q.

Identify the PGR responsible for the following changes given below.
a- Horizontal growth of seedling
b- Swelling of the axis
c- Apical hook formation in dicot seedlings
 

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a

Auxins

b

Ethylene

c

Gibberellins

d

Cytokinins

answer is B.

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Detailed Solution

Influences of ethylene on plants include horizontal growth of seedlings, swelling of the axis and apical hook formation in dicot seedlings like peas. It is commonly known as triple pea test for the presence of Ethylene.

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