Tag: plants and animal hormones

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Questions Related to plants and animal hormones

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

Cytokinins are generally

  1. Acids

  2. Aminopurines

  3. Phenols

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

The first cytokinin discovered was an aminopurine derivative named kinetin. Except zeatin which is adenine derivative, all other present cytokinins are aminopurines. All the naturally occurring cytokinins are substituted purines, in which sixth carbon is substituted by amino group.

Thus, the correct answer is option B.

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

Kinetin like properties are present in

  1. Pineapple

  2. Soyabean

  3. Groundnut

  4. Coconut milk
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Kinetin is a type of cytokinin which is a plant hormone. It promotes cell division. The first known cytokinin hormone was found in coconut milk. Coconut milk is liquid endosperm. It promotes cell division same as kinetin. It stimulates the embryo to grow when it is supplied with food.

Thus, the correct answer is option D.

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

Flowering in some short day plants is promoted by

  1. Auxins

  2. Gibberellins

  3. Cytokinins/ABA

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

Gibberellin is a plant hormone which helps in growth of stem. The rapid growth and flowering with cell division and cell elongation is called as bolting. Bolting requires either long days or cold treatment. Bolting can be induced by higher level of gibberellin under normal conditions. Hence, it induces flowering in some short day plants.

Thus, the correct answer is option B.

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

Cytokinins have the ability to

  1. Induce morphogenesis

  2. Substitute cold treatment

  3. Convert dwarf plants to tall plants

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cytokinins are plant hormones that are involved in various physiological processes. They promotes cell division by stimulating mitosis. Due to increased rate of mitosis, they induce shoot and root morphogenesis. They also plays important role in formation of fruits and seeds.

Thus, the correct answer is option A.

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

Cut pr excised leaves remain green for long if induced to root or dipped in

  1. Gibberellins

  2. Cytokinins

  3. Auxins

  4. Ethylene
Reveal answer Fill a bubble to check yourself
B 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 and keeps leaves green for long time. So when cut or excised leaves are induced to root, it will remain green because root synthesizes cytokinin hormone.

Thus, the correct answer is option B.

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

The regulator which retards ageing senescence of plant parts is

  1. Cytokinin

  2. Auxin

  3. Gibberellin

  4. Abscisic acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cytokinins is a plant hormone. It retards ageing senescence of plant parts and thus keep them productive for longer duration. This is called as Richmond Lang effect. It delays destruction of chlorophyll. It has an effect on protein synthesis and mobilizing nutrients. 

Thus, the correct answer is option A.

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

Cytokinins are mostly

  1. Glucosides

  2. Aminopurines

  3. Acidic

  4. Phenolic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The first cytokinin discovered was an aminopurine derivative named kinetin. Except zeatin which is adenine derivative, all other present cytokinins are aminopurines. All the naturally occurring cytokinins are substituted purines, in which sixth carbon is substituted by amino group.

Thus, the correct answer is 'Glucosides'.

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

Hormone discovered through tissue culture technique is

  1. Auxin

  2. Cytokinin

  3. Gibberellin

  4. Abscisic acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hormone discovered through tissue culture technique is cytokinin. Cytokinin was discovered by Skoog and Miller. The first cytokinin discovered was kinetin. This was isolated as a DNA degradation product. 

Thus, the correct answer is option B.

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

Hormone that promotes growth of lateral buds/has negative effect on apical dominance is

  1. Cytokinin

  2. Gibberellin

  3. Auxin

  4. Both B and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Apical dominance is a phenomenon in which central stem is dominant and lateral stems are suppressed. It is due to plant hormones auxin produced in the tip of the shoot. It promotes apical dominance and does not allow lateral / axillar buds to grow. Another plant hormone, cytokinin is responsible for having negative effect on the apical dominance. It promotes the growth of lateral buds.  

So, the correct answer is 'Cytokinin'