Senescence involves a decrease in in leaves and fruits and an increase in _ at the abscission zones.

IAA; ethylene

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Pfr; gibberellin

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ethylene; IAA

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gibberellin; abscisic acid

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Solution

The correct option is A IAA; ethylene
IAA help to prevent fruit and leaf drop at early stages but promote the abscission of older mature leaves and fruits.
Ethylene promotes senescence and abscission of plant organs, especially of leaves and flowers.
So, the correct option is 'IAA; ethylene'.

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Similar questions

Q. Match the columns and select the correct option.

	Hormones		Functions
A.	Cytokinin	I.	Senescence
B.	Ethylene	II.	Abscission
C.	Abscisic acid	III.	Cell growth
D.	Auxin	IV.	Shoot and root formation

_________ is a gaseous hormone and is involved in abscission of organs and acceleration of fruit ripening.

Q. While conducting an experiment on plant hormones a student found that on using a particular hormone abscission of leaves, senescence, cell division and growth was observed. Which hormone do you think was used on the plants?

Question 20
The substance that triggers the fall of mature leaves and fruits from plants is

(a) auxin
(b) gibberellin
(c) abscisic acid
(d) cytokinin

Q. Ethylene causes apical hook formation in dicot seedlings, promotes senescence and abscission of plant leaves and flowers.

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Senescence involves a decrease in ____ in leaves and fruits and an increase in _____ at the abscission zones.

The correct option is A IAA; ethyleneIAA help to prevent fruit and leaf drop at early stages but promote the abscission of older mature leaves and fruits. Ethylene promotes senescence and abscission of plant organs, especially of leaves and flowers. So, the correct option is 'IAA; ethylene'.

Senescence involves a decrease in in leaves and fruits and an increase in _ at the abscission zones.

The correct option is A IAA; ethylene
IAA help to prevent fruit and leaf drop at early stages but promote the abscission of older mature leaves and fruits.
Ethylene promotes senescence and abscission of plant organs, especially of leaves and flowers.
So, the correct option is 'IAA; ethylene'.