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Growth in Plants

Description: phytohormones growth AbscissionPhases of Growth in PlantsPlant Growth RegulatorsPlant Growth RegulatorsGrowth and DevelopmentPlant Growth and Development
Number of Questions: 15
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Tags: phytohormones growth Abscission Phases of Growth in Plants Plant Growth Regulators Growth and Development Plant Growth and Development
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Abscisic acid causes _____________.

  1. faster leaf fall

  2. dormancy of tubers

  3. retardation of growth

  4. senescence of leaves

  5. all of the above are correct

Show answer
Correct Option: E
Explanation:

All the options are correct and reveal the functions of ABA.

IAA generally inhibits the growth of :

  1. roots

  2. leaves

  3. shoots

  4. whole plant

  5. seeds

Show answer
Correct Option: A
Explanation:

IAA is indole acetic acid, which is auxin. It reduces or inhibits the growth of root.

What does hyponasty term refers to?

  1. Growth is less on the lower surface of the leaf.

  2. Growth is more on the lower surface of the leaves.

  3. There is no growth on the upper surface of the leaves.

  4. Growth is equal on both the surfaces.

  5. All the above are correct.

Show answer
Correct Option: B
Explanation:

An upward bending of leaves or other plant parts, resulting from growth of the lower side is called hyponasty.

Synthesis of amylase in certain cereals is stimulated by which of the following?

  1. IAA

  2. GA

  3. ABA

  4. CK

  5. Ethylene

Show answer
Correct Option: B
Explanation:

It is gibberellin. It is a phytohormone which stimulates the synthesis of amylase in certain cereals.

The rosette habit of cabbage can be changed drastically to vine by the application of _________.

  1. IAA

  2. GA

  3. CK

  4. ABA

  5. Ethylene

Show answer
Correct Option: B
Explanation:

Gibberellins are substances which promote shoot elongation, hence rosette habit of cabbage can be changed by the application of gibberellic acid.

Growing point possess _____________.

  1. meristematic cells

  2. mature cells

  3. dead cells

  4. slowly enlarging cells

  5. growth inhibitors

Show answer
Correct Option: A
Explanation:

The undifferentiated plant tissue from which new cells are formed, as that at the tip of a stem or root.

Apical dominance in higher plants is due to _____________.

  1. balance between auxin and cytokinin

  2. enzymatic activity

  3. carbohydrate and nitrogen ratio

  4. photoperiodism

  5. the presence of apical dominance

Show answer
Correct Option: A
Explanation:

It is true that auxin and cytokinin ratio controls morphogenesis in higher plants and thus regulating the apical dominance.

Growth in the plant is measured by __________.

  1. potometer

  2. microscope

  3. auxanometer

  4. calorimeter

  5. manometer

Show answer
Correct Option: C
Explanation:

It is an apparatus for measuring increase or rate of growth in plants.

What are the certain chemical substances having deep effect on growth called?

  1. Phytohormones

  2. Enzymes

  3. Vitamins

  4. Minerals

  5. None of the above

Show answer
Correct Option: A
Explanation:

Phytohormones function to coordinate plant growth and development.

If a gardener is interested in obtaining a good crop of tea leaves from a single plant, what should he do?

  1. Feed auxin to the plant through soil.

  2. Remove the apical bud of the main shoot and the branches.

  3. Cut off the tip of the plant and then apply auxins to the cut end.

  4. Supply auxin from the tip of the plant as well as through roots.

  5. Not apply auxin at all.

Show answer
Correct Option: B
Explanation:

It will relieve the plant of the phenomena called as apical dominance and after removing the apical bud growth will occur vigorously including the lateral buds.

Gibbrellin is obtained from__________.

  1. gibberella (an algae)

  2. gibberella (a fungus)

  3. basidiolichen

  4. bacterium

  5. virus

Show answer
Correct Option: B
Explanation:

Gibberellin is obtained from gibberella fujikuroi, which is a fungus.

Which of the following is a natural growth regulator?

  1. Benzaldehyde

  2. NAA

  3. 2, 4-D

  4. Ethylene

  5. IBA

Show answer
Correct Option: D
Explanation:

It is a natural growth inhibitor hormone.

Which is the role not played by ethylene?

  1. Inhibition of elongation of stem.

  2. It increases the number of female flowers and reduces the number of male flowers.

  3. It causes ripening of fruits.

  4. It causes abscission of leaves.

  5. It increases maleness in some plants.

Show answer
Correct Option: E
Explanation:

This function is promoted by gibberellin.

Which phytohormone is responsible for the bakanae disease of rice?

  1. Gibberellin

  2. Cytokinin

  3. Abscisic acid

  4. Auxin

  5. Ethylene

Show answer
Correct Option: A
Explanation:

Gibberellin is responsible for this disease. Its symptoms are abnormal growth of stem and leaves.

Which is not the specific function of auxin?

  1. Helps in apical dominance.

  2. Induces parthenocarpy

  3. Control of weeds

  4. Prevention of lodging

  5. Fruit ripening

Show answer
Correct Option: E
Explanation:

It is the exclusive feature of ethylene and not auxins.

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