Tag: plant hormones

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Questions Related to plant hormones

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

Interfascicular cambium formation is induced by

  1. Auxin

  2. Cytokinin

  3. Gibberellin

  4. Ethylene
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Cytokinin synthesis is maximum in

  1. Roots

  2. Leaves

  3. Shoot tip

  4. Fruit
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

Which of the following is a cytokinin?

  1. Phytochrome

  2. Leucine

  3. Ethylene

  4. Zeatin
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Induction of cell division and delay in senescence are due to

  1. Gibberellin

  2. Auxin

  3. Cytokinin

  4. Ethylene
Reveal answer Fill a bubble to check yourself
C Correct answer
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'

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

Which is not a function of cytokinin?

  1. Delay is senescence

  2. Breaking seed dormancy

  3. Promoting bud dormancy

  4. Promoting stomatal opening
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Transport of cytokinin in the plant body is

  1. Basipetal

  2. Lateral

  3. Acropetal

  4. On all sides
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Natural cytokinins are synthesised in tissues that are

  1. Storing food

  2. Differentiating

  3. Dividing

  4. Senescent
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Natural cytokinins are synthesized in tissues for

  1. Differentiating

  2. Senescent

  3. Dividing

  4. Storing food
Reveal answer Fill a bubble to check yourself
C Correct answer
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.