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Life Processes

Coordination in Plants Practice Questions

19 free Coordination in Plants practice questions for the General Science. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.

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Question 1 of 19 Medium

What does coordination in plants mainly involve?

  1. A Movement controlled directly by a system of nerves and muscles
  2. B Digestion of food that occurs within specialized internal organs
  3. C Movement and responses controlled mainly by hormones and external stimuli
  4. D Circulation of blood pumped continuously through a network of vessels

Correct answer: Movement and responses controlled mainly by hormones and external stimuli

Plants do not have nerves and muscles like animals. Their coordination mainly occurs through chemical substances called plant hormones and responses to environmental stimuli.

Question 2 of 19 Medium

Which of the following is a plant hormone?

  1. A Insulin
  2. B Haemoglobin
  3. C Pepsin
  4. D Auxin

Correct answer: Auxin

Auxin is a plant hormone that helps regulate growth and responses such as phototropism. Insulin, haemoglobin, and pepsin are associated with animal physiology.

Question 3 of 19 Medium

Roots growing downward into the soil show:

  1. A Negative geotropism
  2. B Positive phototropism
  3. C Positive geotropism
  4. D Negative hydrotropism

Correct answer: Positive geotropism

Geotropism is growth in response to gravity. Roots grow in the direction of gravity, so they show positive geotropism.

Question 4 of 19 Medium

Shoots usually show negative geotropism because they:

  1. A Grow toward gravity
  2. B Grow only in water
  3. C Do not respond to gravity
  4. D Grow away from gravity

Correct answer: Grow away from gravity

Negative geotropism means growth away from the direction of gravity. Plant shoots generally grow upward, opposite to gravity.

Question 5 of 19 Medium

The growth of roots toward water is known as:

  1. A Phototropism
  2. B Chemotropism
  3. C Thigmotropism
  4. D Hydrotropism

Correct answer: Hydrotropism

Hydrotropism is the growth response of plant parts toward or away from water. Roots commonly show positive hydrotropism by growing toward moisture.

Question 6 of 19 Medium

The growth of pollen tube toward the ovule is an example of:

  1. A Phototropism
  2. B Geotropism
  3. C Chemotropism
  4. D Hydrotropism

Correct answer: Chemotropism

Chemotropism is growth in response to chemical stimuli. The pollen tube grows toward chemicals released by the ovule, helping fertilization occur.

Question 7 of 19 Medium

The curling of tendrils around a support is an example of:

  1. A Phototropism
  2. B Hydrotropism
  3. C Geotropism
  4. D Thigmotropism

Correct answer: Thigmotropism

Thigmotropism is a growth response to touch. Tendrils curl around a support when they come in contact with it.

Question 8 of 19 Medium

Which plant hormone is mainly responsible for cell elongation in shoots?

  1. A Ethylene
  2. B Abscisic acid
  3. C Auxin
  4. D Cytokinin

Correct answer: Auxin

Auxin promotes cell elongation, especially in shoots. Unequal distribution of auxin can cause bending responses such as phototropism.

Question 9 of 19 Medium

Which plant hormone promotes cell division?

  1. A Abscisic acid
  2. B Ethylene
  3. C Cytokinin
  4. D Melatonin

Correct answer: Cytokinin

Cytokinins stimulate cell division in plants. They are important in growth, development, and the formation of new plant tissues.

Question 10 of 19 Medium

Which plant hormone is commonly associated with fruit ripening?

  1. A Gibberellin
  2. B Auxin
  3. C Cytokinin
  4. D Ethylene

Correct answer: Ethylene

Ethylene is a gaseous plant hormone that promotes fruit ripening. It also plays roles in leaf fall and aging of plant parts.

Question 11 of 19 Medium

Which hormone is known as a growth-inhibiting hormone in plants?

  1. A Auxin
  2. B Gibberellin
  3. C Abscisic acid
  4. D Cytokinin

Correct answer: Abscisic acid

Abscisic acid generally inhibits growth and helps plants respond to stress. It also promotes seed dormancy and closure of stomata during water shortage.

Question 12 of 19 Medium

Which plant hormone helps in stem elongation and seed germination?

  1. A Ethylene
  2. B Abscisic acid
  3. C Gibberellin
  4. D Insulin

Correct answer: Gibberellin

Gibberellins promote stem elongation and help break seed dormancy. They are important in plant growth and germination.

Question 13 of 19 Medium

The folding of Mimosa pudica leaves when touched is an example of:

  1. A Growth movement
  2. B Phototropism
  3. C Geotropism
  4. D Nastic movement

Correct answer: Nastic movement

Mimosa pudica shows a nastic movement because the response is not dependent on the direction of the stimulus. The leaves fold due to changes in water pressure in specialized cells.

Question 14 of 19 Medium

Which statement correctly describes tropic movements?

  1. A They occur only in animals and are never seen in any plant species
  2. B They do not involve any measurable growth of the plant whatsoever
  3. C They are directional growth responses made toward or away from stimuli
  4. D They are always much faster than nerve impulses found in animals

Correct answer: They are directional growth responses made toward or away from stimuli

Tropic movements are directional growth movements in response to stimuli such as light, gravity, water, chemicals, or touch. They are usually slow because they involve growth.

Question 15 of 19 Medium

Which statement correctly describes nastic movements?

  1. A They depend on the direction of the stimulus
  2. B They occur only in roots
  3. C They always involve seed formation
  4. D They are non-directional responses to stimuli

Correct answer: They are non-directional responses to stimuli

Nastic movements are responses that do not depend on the direction of the stimulus. Examples include folding of Mimosa leaves and opening or closing of some flowers.

Question 16 of 19 Medium

Why do plant shoots bend toward light?

  1. A Auxin completely stops all growth occurring on the shaded side of the shoot
  2. B Light directly pulls and physically drags the shoot toward itself
  3. C Auxin builds up more on the shaded side, driving greater elongation there
  4. D Roots actively push the shoot upward and toward the Sun's position

Correct answer: Auxin builds up more on the shaded side, driving greater elongation there

In shoots, auxin often accumulates on the shaded side when light comes from one direction. Cells on that side elongate more, causing the shoot to bend toward the light.

Question 17 of 19 Medium

Which of the following is a stimulus for plant movement?

  1. A Haemoglobin
  2. B Bone tissue
  3. C Light
  4. D Blood plasma

Correct answer: Light

Light is an external stimulus that can cause plant responses such as phototropism. Plants can also respond to gravity, water, touch, and chemicals.

Question 18 of 19 Medium

How is coordination in plants different from coordination in animals?

  1. A Plants use only their muscles to coordinate all movement
  2. B Plants have a brain but produce no hormones
  3. C Plants cannot respond to any stimuli at all
  4. D Plants use hormones and growth responses, not nerves

Correct answer: Plants use hormones and growth responses, not nerves

Plants do not have a nervous system like animals. Their coordination is mainly controlled by hormones and changes in growth or cell pressure.

Question 19 of 19 Medium

Stomatal closure during water shortage is mainly influenced by which plant hormone?

  1. A Auxin
  2. B Ethylene
  3. C Abscisic acid
  4. D Gibberellin

Correct answer: Abscisic acid

Abscisic acid helps plants respond to water stress by causing stomata to close. This reduces water loss through transpiration.

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