Role of Ethylene

Q. Ethylene is used in pineapples to

1. induce flowering
2. synchronise the fruit-set
3. ensure simultaneous flowering of all plants
4. all the above

Q. Match the following:

Column I	Column II
A. 2, 4-D	i. Promoting bolting in biennials
B. GA3	ii. Promotes female flower in cucumbers
C. Cytokinins	iii. Induce dormancy in seeds
D. Ethephon	iv. Herbecide to kill dicotyledonous weed
E. ABA	v. Delay leaf senescence

1. A- ii, B-iv, C-i, D-iii, E-v
2. A- iv, B-i, C-v, D-ii, E-iii
3. A- i, B-v, C-ii, D-iii, E-iv
4. A- iii, B-ii, C-iv, D-v, E-i

Q.

Do gibberellins promote senescence?

Q. Assertion (A): Ethylene indirectly reduces water absorption in plants.
Reason (R): It prevents the formation of root hairs.

1. Both A and R are correct and R is the correct explanation of A
2. Both A and R are correct but R is not the correct explanation of A
3. Only A is correct
4. Both A and R are incorrect

Q. Which phytohormone is synthesised in ripened fruits?

1. ABA
2. Auxin
3. Cytokinin
4. Ethylene

Q. Choose the option which is not an effect of ethylene from the choices given below.

1. Senescence
2. Bolting
3. Abscission
4. Thinning

Q. Match the following concerning the activity/function and the phytohormone involved:

(a)	Fruit ripener	(i)	Abscisic acid
(b)	Herbicide	(ii)	$G{A}_3$
(c)	Bolting agent	(iii)	2, 4-D
(d)	Stress hormone	(iv)	Ethephon

Select the correct option from following.

1. (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
2. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
3. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
4. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

Q. Covering in wax papers prevent mangoes from

1. forming of ethylene that fastens the ripening of mangoes
2. enhancing the respiratory rate
3. softening of the tissues
4. all the above

Q.

Match the names of plant hormones mentioned under column I, with the physiological effects listed under column II. Choose the answer which gives the correct combinations of the alphabets

$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ & \text{Plant Hormones}& & \text{Physiological Effect}\\ A& \text{Gibberellin}& e& \text{Cell division}\\ B& \text{Auxin}& f& \text{Internodal elongation}\\ C& \text{Kinetin}& g& \text{Ripening of fruits}\\ D& \text{Ethylene}& h& \text{Abscission}\\ & & i& \text{Apical dominance}\end{array}$

1. A = f, B = e, C =i, D = g

2. A = f, B= g, C = i, D = e

3. A = f, B = C = g, D =e

4. A = f, B = i; C = e, D = g

Q. Assertion (A): Ethylene indirectly reduces water absorption in plants.
Reason (R): It prevents the formation of root hairs.

1. Both A and R are correct and R is the correct explanation of A
2. Both A and R are correct but R is not the correct explanation of A
3. Only A is correct
4. Both A and R are incorrect

Q. Ethylene is used in pineapples to

1. induce flowering
2. synchronise the fruit-set
3. ensure simultaneous flowering of all plants
4. all the above

Q. Which of the following plant part(s) undergo(es) senescence under the influence of the gaseous plant growth regulator?

1. Fruits
2. Flowers
3. Leaves
4. All of the above