Role of Ethylene

Q. A plant hormone that promotes female flowers in cucumber is:

1. Ethylene
2. NAA
3. Abscisic acid
4. 2, 4-D

Q. Respiratory climactic is found in

1. bananas
2. melons
3. tomatoes
4. all the above

Q. Triple response is seen due to which plant hormone?

1. Auxin
2. Gibberellin
3. Ethylene
4. Abscisic Acid

Q. Treatment of seeds at low temperature under moist conditions to break its dormancy is called

1. chelation
2. scarification
3. vernalization
4. stratification

Q.

Assertion (A): Ethylene increases the yield of cucumbers

Reason(R): Ethylene promotes female flowers in cucumber

1. Both A & R are true and R explains A

2. Both A & R are true and R does not explain A

3. A is true and R is false

4. Both A & R are false

Q. Ethylene is used in pineapples to

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

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

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

Q. Which of the following statements regarding ethylene is/are correct?
I. Ethylene influences the growth of seeds and seedlings.
II. It helps in breaking the dormancy of seeds.
III. It promotes the formation of apical hook in dicots, germination and horizontal growth of seedlings.

1. Only I is correct
2. I, II and III are correct
3. Only II is correct
4. I and III are incorrect

Q.

Question 06:

Apples are generally wrapped in waxed paper to
(a) prevent sunlight for changing its colour
(b) prevent aerobic respiration by checking the entry of
(c) prevent ethylene formation due to injury
(d) make the apples look attractive

Q. Which of the following point about root hairs or trichomes is not correct?

1. Trichomes are epidermal hairs present on aerial parts of the plant while root hairs are present in the root
2. Trichomes absorb water from the atmosphere while root hairs from soil
3. Trichomes are usually multicellular while root hairs are unicellular
4. Trichomes may be branched but root hairs are always unbranched

Q.

Artificial ripening of fruits is carried out by

1. Auxin

2. Gibberellin

3. Abscisic acid

4. Ethylene

Q.

Rise in respiration during fruit ripening is called

1. Respiratory maxima

2. Respiratory climax

3. Respiratory climacteric

4. Respiratory efficiency

Q. Which of the following options given below best identifies the effect of ethylene has on shoots?

1. Internode elongation in deep water rice plants
2. All of the above
3. Sprouting of potato tubers
4. Breaking of bud dormancy

Q.

Which fruit produces the most ethylene?

Q. Respiratory climactic is found in

1. tomatoes
2. bananas
3. melons
4. all of the above

Q.

Which of the following is not an effect of ethylene?

1. Promotes senescence and abscission of plant organs

2. Breaks seed and bud dormancy

3. Brings about horizontal growth of seedlings

4. Helps to overcome apical dominance

5. Hastens fruit ripening

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. All of the above
4. Leaves

Q. Which phytohormone is synthesised in ripened fruits?

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

Q.

Question 19:

A farmer grows cucumber plants in his field. He wants to increase the number of female flowers in them. Which plant growth regulator can be applied to achieve this?

Q. “One Rotten Mango can spoil the entire basket” this popular proverb is based on the action of

1. gibberellin
2. cytokinin
3. abscisic acid
4. ethylene

Q. Which of the following statement(s) regarding the respiratory climactic is/are correct?

1. It is associated with an increase in the rate of respiration
2. It is found in fruits like apples, bananas, melons, tomatoes
3. It causes colour change and sugar release in fruits
4. All the above

Q. Which phytohormone is synthesised in ripened fruits?

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

Q. The phenomenon of growth is immediately followed by

1. senescence
2. maturation
3. differentiation
4. development

Q.

Question 17:

Gibberellins promote the formation of ______ flowers on henetically ______ plants in Cannabis whereas ethylene promotes formation of ______ flowers on genetically ______ plants.

Q. Highest proportion of ethylene is found in

1. green apple
2. ripened banana
3. green banana
4. fresh potato tuber

Q.

Question 01:

Ethylene is used for
(a) retarding ripening of tomatoes
(b) hastening of ripening of fruits
(c) slowing down ripening of apples
(d) Both (b) and (c)

Q. Covering in wax papers prevent mangoes from

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

Q.

The mechanical method of removal of seed dormancy, applied on the seed coat is called _______.

1. Stratification

2. Vernalization

3. Photoperiodism

4. Scarification

Q.

Give one word for the following:

The gas which is present naturally and helps to kill harmful germs and bacteria is

Q.

"Senescence" is promoted by the application of _____.

1. Ethephon

2. BAP

3. IBA

4. 2, 4-D