Tag: plant hormones

Questions Related to plant hormones

How many following statements are correct for ethylene ?


1) Ethylene breaks the seed and bud dormancy
2) Ethylene promotes rapid petiole elongation in deep water rise plant
3) Ethylene promotes root growth and root hair formation
4) Ethylene promotes female flowers in cucumbers

biology chemical coordination in plants ethylene plant hormones plants and animal hormones

  1. 1

  2. 2

  3. 3

  4. 4

Show answer
Correct Option: A
Explanation:

Ethylene induces seed germination. It breaks seed and bud dormancy. So 1 is the right answer.

The activity of alpha-amylase in the endosperm of barley plants is induced by _____________.

biology chemical coordination in plants ethylene plant hormones plants and animal hormones

  1. Ethylene

  2. Cytokine

  3. IAA

  4. Gibberellins

Show answer
Correct Option: A

Application of which of the following hormones delays the onset of senescence in detached leaves?

biology chemical coordination in plants ethylene plant hormones plants and animal hormones

  1. Ethylene

  2. Abscises acid

  3. Gibberellins

  4. Cytokine

Show answer
Correct Option: A

Choose the correct answer from the alternatives given.
When mature green tomatoes are put in a sealed plastic bag, they remain green for several days. But, if one or two ripe apples are kept alongwith green tomatoes in the sealed container, the tomatoes turn red within a few days. It may be due to the fact that ripe apples:

biology chemical coordination in plants ethylene plant hormones plants and animal hormones

  1. produce ethylene which induces tomato ripening

  2. remove carbon dioxide which initiates fruit ripening

  3. absorb ethylene which induces tomato ripening

  4. absorb carbon dioxide released from green tomatoes

Show answer
Correct Option: A
Explanation:

Ethylene is highly effective in fruit ripening. It enhances the respiration rate during ripening of the fruits. 

So, the correct option is 'produce ethylene which induces tomato ripening'.

Choose the correct answer from the alternatives given.
Which of the following plant hormone is a gas?

biology chemical coordination in plants ethylene plant hormones plants and animal hormones

  1. Auxin

  2. Cytokinin

  3. Ethylene

  4. Gibberellin

Show answer
Correct Option: C
Explanation:

Ethylene is a small hydrocarbon gas. Ethylene is responsible for the changes in texture, softening, colour, and other processes involved in ripening. 

So, the correct option is 'Ethylene'.

Artificial ripening of fruits is caused by the treatment of

biology chemical coordination in plants ethylene plant hormones plants and animal hormones

  1. IAA

  2. NAA

  3. Ethylene

  4. Kinetin.

Show answer
Correct Option: C
Explanation:

Artificial ripening of fruits is caused by the treatment of ethylene. This process is achieved by spraying a commercial product Ethephon, that releases ethylene gradually on aerobic degradation. It is generally used for the faster ripening of cotton, wheat, coffee, tobacco, rice etc

So, the correct answer is 'Ethylene'

Gibberellins promote the formation of  A  flowers on genetically  B  plants in Cannabis whereas ethylene promotes formation of  C  flowers on genetically  D  Cannabis plants.

biology chemical coordination in plants ethylene plant hormones plants and animal hormones

  1. A-male, B-female, C-female, D-male

  2. A-male, B-male, C-female, D-female

  3. A-female, B-male, C-male, D-female

  4. A-female, B-female, C-male, D-male

Show answer
Correct Option: A
Explanation:
Gibberellins are growth hormones that stimulate cell elongation and cause plants to grow taller. Gibberellins also have a role in other plant processes, such as stem elongation, germination, flowering, and fruit ripening. Gibberellins promote the formation of male flowers on genetically female plants in Cannabis whereas ethylene promotes formation of female flowers on genetically male Cannabis plants.
 So, the correct answers are "A- Male, B- Female, C- Female, D- Male."

Ethylene is used for _________________.

biology chemical coordination in plants ethylene plant hormones plants and animal hormones

  1. retarding ripening of tomatoes

  2. hastening of ripening of fruits

  3. slowing down ripening of apples

  4. both (b) and (c).

Show answer
Correct Option: B
Explanation:

Ethylene is a fruit ripening hormone. It stimulates the biochemical changes which take place upon fruit ripening.

The most widely used compound as a source of $C 2H _4$ is ___________.

biology chemical coordination in plants ethylene plant hormones plants and animal hormones

  1. kinetin

  2. zeatin

  3. IBA

  4. ethephon

Show answer
Correct Option: D
Explanation:

Ethephon, 2-chloroethyl phosphonic acid (Ethrel) is a source of ethylene used commercially. It is used in aqueous solution and releases ethylene slowly.

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?

biology chemical coordination in plants ethylene plant hormones plants and animal hormones

  1. ABA

  2. Ethylene

  3. GA

  4. Cytokinins

Show answer
Correct Option: B
Explanation:

Ethylene has a feminising effect on sex expression. The genetically male plants of cucumber can be induced to produce female flower in the presence of ethylene. The number of female flowers and hence fruit is enhanced in these plants.