Tag: cytokinins

Questions Related to cytokinins

Plant hormones used for inducing morphogenesis in plant tissue culture is

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

  1. Gibberellins

  2. Ethylene

  3. Cytokinins

  4. ABA

Show answer
Correct Option: C
Explanation:

Morphogenesis is the process of development of shape of an organism. Cytokinins which is present at the site where rapid cell division occurs like root apices, developing shoot buds it helps in plant growth and attaining its shape. So it will help the plant to maintain its shape in tissue culture.

So the correct option is 'Cytokinins'.

State whether the following statements are true or false.
The plant ageing process, senescence, is prevented by cytokinins.

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

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Cytokinin is a plant growth hormone that is basic in nature and is responsible for cell division. This results in cell elongation, growth, and development of plants, they work similar to auxins. Cytokinins are helpful in delaying and stopping the senescence of leaves thus resulting in the process of aging to stop by the mobilization of nutrients in the required part of the plant.

So, the correct statement is 'True'.

Cytokinins helps to produce all except

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

  1. New leaves

  2. Chloroplast in leaves

  3. Lateral short growth and adventitious shoot formation

  4. Rooting on cut stem

Show answer
Correct Option: D
Explanation:

 Cytokinins are plant hormones that cause increased cell division by stimulating the process of mitosis. They help in the production of new leaves, formation of chloroplasts in leaves, lateral shoot growth and adventitious shoot formation. They do not have any role in root formation. So, the correct option is 'Rooting on the cut stem'.

Hormone primarily concern with cell division is

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

  1. IAA

  2. NAA

  3. Cytokinin

  4. Gibberellic acid.

Show answer
Correct Option: C
Explanation:

Cytokinin helps in cytokinesis. Cytokinin induces cell division in the shoots. Cytokinin positively regulates cell cycle along with auxin.

Thus, the correct answer is 'Cytokinin.'

Ageing is retarted by

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

  1. ABA

  2. CKN

  3. GA

  4. C2H4

Show answer
Correct Option: B
Explanation:

Ageing is retarded by the CKN. 

Ageing is the process in which the human being progressively more likely to die. So, Ageing is retarded by CKN.
Hence, option B is correct.