Which of the following statements about plant hormones is false?

1. The growth of plants in nature is probably regulated by a combination of growth-stimulating and growth-inhibiting hormones.

2. Abscisic acid generally promotes growth.

3. Gibberellins stimulate cell enlargement.

4. Cytokinins promote cell division.

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At the root apex the cells of the meristematic region are not characterized by:-

1. Being rich in protoplasm
2. Abundant plasmodesmatal connections
3. A cell wall that is primary in nature
4. Having small inconspicuous nuclei

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All the following plants are biennials except:-
1. Sugarbeet
2. Cabbages
3. Carrots
4. Wheat

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Identify the option where all the columns are not correctly matched:

 

PGR

Nature

Actions

1.

Auxin

Indole compounds

Apical dominance, Flowering in pineapples, Parthenocarpy in tomatoes

2.

Cytokinin

Adenine derivative

 

Cell division, Adventitious shoot formation, Delay in leaf senescene

3.

Gibberellin

Terpene

Increase in length

4 .

ABA

Carotenoid derivative

Closure of stomata in water stress, inducing seed dormancy, inducing flowering in mango

 

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The sites of perception of light/dark duration in the plants are the:-

1. Shoot apices
2. Leaves
3. Roots
4. Branches

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The PGR used to induce parthenocarpy in tomatoes is:-

1. Auxin
2. Gibberellin
3. Cytokinin
4. ABA

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The asexual production of seeds is called as:
1. Adventition
2. Fragmentation
3. Self-fertilization
4. Apomixis

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Primary and secondary growth are inhibited by:

1. Auxins

2. Gibberellins

3. Abscisic acid

4. Cytokinins

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Fruit and leaf drop at early stages can be prevented by the application of 
1. Cytokinins
2. ethylene
3. auxins
4. gibberellic acid 

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you are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?
(a) IAA and gibberellin 
(b) Auxin and cytokinin
(c) Auxin and abscisic acid
(d) Glbberellin & abscisic acid

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