Tag: chemical coordination in plants

Questions Related to chemical coordination in plants

Cytokinin is not found in

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

  1. Root apex

  2. Shoot apex

  3. Young fruits

  4. Mature fruits

Show answer
Correct Option: D
Explanation:

Cytokinin is a plant hormone that promotes cell division in root apex, shoot apex and young fruits. It is also involved in apical dominance and leaf senescence. They are not found in mature fruits.

Thus, the correct answer is option D.

Which one is growth regulator produced by plants?

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

  1. NAA

  2. Zeatin

  3. 2, 4-D

  4. BAP

Show answer
Correct Option: B
Explanation:

Naphthaleneacetic acid (NAA) is a type of synthetic auxin, plant hormone. It is a growth regulator. It acts as rooting agent. Zeatin a type of naturally occurring cytokinin, the plant hormone. It was first discovered in Zea maize. A 2, 4-D is a type of synthetic auxin, plant hormone. It acts as weedicide. BAP (Benzylaminopurine) is a type of synthetic cytokinin, a plant hormone. It is involved in various physiological processes of plants like cell division.

Thus, the correct answer is option B.

Cytokinins which have specific effect in cytokinesis are modified forms of

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

  1. Cytosine

  2. Adenine

  3. Guanine

  4. Thiamine

Show answer
Correct Option: B
Explanation:

Cytokinin is a plant hormone. It has the specific effect in cytokinesis in plants. It is modified form of adenine. Kinetin, zeatin, and 6-benzylaminopurine are adenine type cytokinins. It is adenine molecule that is modified by the addition of 5-carbon sidechains off the 6 position.

Thus, the correct answer is option B.

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.