Tag: plant hormones

Questions Related to plant hormones

Interfascicular cambium formation is induced by

  1. Auxin

  2. Cytokinin

  3. Gibberellin

  4. Ethylene


Correct Option: B
Explanation:

Cytokinin is a plant hormone which is involved in growth and development of plants. It is required for the cambial growth. Kinetin, a type of cytokinin promotes cell division. It induces formation of interfascicular cambium in plants.

Thus, the correct answer is option B.

Cytokinin synthesis is maximum in

  1. Roots

  2. Leaves

  3. Shoot tip

  4. Fruit


Correct Option: A
Explanation:

Cytokinin is a plant hormone. It promotes cell division. It also delays the destruction of chlorophyll and protein. It shows delay of senescence in leaves. It is mostly produced in the root apex. Roots synthesize maximum amount of cytokinin hormone.

Thus, the correct answer is 'Roots'.

Which of the following is a cytokinin?

  1. Phytochrome

  2. Leucine

  3. Ethylene

  4. Zeatin


Correct Option: D
Explanation:

Cytokinin is a plant hormone which is involved in various physiological processes of plants. Zeatin is the most common type of naturally occurring cytokinin. It is found in maize. It is also found in the coconut milk. It promotes cell division.

Thus, the correct answer is option D.

Induction of cell division and delay in senescence are due to

  1. Gibberellin

  2. Auxin

  3. Cytokinin

  4. Ethylene


Correct Option: C
Explanation:

Cytokinin is a plant hormone. It plays major role in cell proliferation and cell division. It also delays the destruction of chlorophyll and protein. During senescence, cytokinin levels are low. It delays in senescence of leaves when sprayed externally by delaying the destruction of chlorophyll and proteins in leaves

So, the correct answer is 'Cytokinin'

Which is not a function of cytokinin?

  1. Delay is senescence

  2. Breaking seed dormancy

  3. Promoting bud dormancy

  4. Promoting stomatal opening


Correct Option: C
Explanation:

Cytokinin (CK) is a plant hormone. It promotes cell division and delays senescence in plants. It improves nutrient mobilization and thus delays leaf senescence. When applied externally, it mobilizes nutrients towards sites of application. It also promotes stomatal opening along with auxin hormone. It also breaks the dormancy of seeds and induce seed germination. 

Thus, the correct answer is option C.

Which plant hormone was discovered as kinetin?

  1. ABA

  2. Ethylene

  3. Auxin

  4. Cytokinin


Correct Option: D
Explanation:

Kinetin was first isolated from herring sperm DNA by Miller and Skoog. It is a type of naturally occurring cytokinin, a plant hormone. It promotes growth. It induces cell division or cytokinesis.

Thus, the correct answer is option D.

Transport of cytokinin in the plant body is

  1. Basipetal

  2. Lateral

  3. Acropetal

  4. On all sides


Correct Option: C
Explanation:

Cytokinin is a plant hormone that is synthesized in the root. It shows acropetal transport. It is exactly opposite to the basipetal transport of auxin hormone. Acropetal transport is the translocation of hormone towards the shoot apex.

Thus, the correct answer is option C.

Natural cytokinins are synthesised in tissues that are

  1. Storing food

  2. Differentiating

  3. Dividing

  4. Senescent


Correct Option: C
Explanation:

Cytokinin is a plant hormone that is involved in various physiological processes. It is growth promoting hormone. It stimulates cell division or cytokinesis and hence the name was given. It is synthesized in high concentration in tissues that are dividing such as cambium.

Thus, the correct answer is option C.

Natural cytokinins are synthesized in tissues for

  1. Differentiating

  2. Senescent

  3. Dividing

  4. Storing food


Correct Option: C
Explanation:
Cytokinin is a naturally occurring plant growth hormone (PGR) extracted from coconut milk.
Cytokinins are synthesized in root apex, endosperm of seeds, and young fruits where cell division takes place continuously. 
They stimulate cell division, cell enlargement and cell differentiation and also prevent ageing of plant parts.
Hence, natural cytokinins are synthesized in tissues for dividing.
So, the answer is C.

The precursor of Serine and Cytokine is?

  1. Oxalocetate

  2. $3$-phosphoglycerate

  3. Phosphoenolpyruvate

  4. Erythrose-$4$-phosphate


Correct Option: A