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Plant Growth and Development (Class - XI)

Plant Growth and Development

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following cause increase in the girth of the plant organ in which they are active?

a. Vascular cambium
b. Root apical meristem
c. Cork cambium
d. Shoot apical meristem

  1. Only a and b
  2. Only a and c
  3. Only a and d
  4. Only b and c
  5. Only b and d
Question 2 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. In dicotyledonous plants and gymnosperms, the lateral meristems appear very early in life.
b. Plant growth is accompanied by both anabolic and catabolic processes.
c. The ability of plants for unlimited growth throughout life is due to the presence of meristems at certain locations in their body.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 3 Multiple Choice (Single Answer)

The period of growth is divided into three phases. Which of the following is not a property of the cells of meristematic phase?

  1. The cell walls are primary in nature, thin and cellulosic.
  2. The cells have abundant plasmodesmatal connections.
  3. The cells are rich in protoplasm.
  4. The cells possess large conspicuous nuclei.
  5. Cells enlarge in this phase.
Question 4 Multiple Choice (Single Answer)

Which of the following plant growth regulators is/are not involved in growth promoting activities?

  1. Auxins
  2. Cytokinins
  3. Gibberellins
  4. Abscisic acid
  5. None of these
Question 5 Multiple Choice (Single Answer)

Which of the following statements is/are false regarding the phase of maturation?

a. The cells in this phase attain their maximal wall thickening.
b. The cells in this phase attain their maximal protoplasmic modifications.
c. The cells in this phase have increased vacuolation.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only c
  5. Only b and c
Question 6 Multiple Choice (Single Answer)

During differentiation, the cells undergo structural changes. Which of the following changes do(es) not occur in differentiation?

a. The cells lose their protoplasm.
b. The cells regain the capacity of division under certain conditions.
c. The cells develop a very strong, elastic lignocellulosic secondary cell wall.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 7 Multiple Choice (Single Answer)

Both intrinsic and extrinsic factors control the development in plants. Which of the following factors are intrinsic?

a. Temperature
b. Nutrition
c. Genetics
d. Growth regulators

  1. Only a and b
  2. Only a and c
  3. Only a and d
  4. Only b and c
  5. Only c and d
Question 8 Multiple Choice (Single Answer)

Which of the following plant growth regulators is/are sprayed on juvenile conifers to hasten their maturity period?

  1. Cytokinins
  2. Ethylene
  3. Auxins
  4. Abscisic acid
  5. Gibberellins
Question 9 Multiple Choice (Single Answer)

Which of the following scientists isolated auxin from the tips of coleoptiles of oat seedlings?

  1. G. N. Ramachandran
  2. F. Skoog
  3. Kurosawa
  4. Charles Darwin
  5. F. W. Went
Question 10 Multiple Choice (Single Answer)

Match the following:

</strong
Medium of growth of plants Function
a. Water 1. It helps in releasing metabolic energy essential for growth activities.
b. Oxygen 2. It is required by plants for the synthesis of protoplasm and it acts as a source of energy.
c. Nutrient 3. It provides the medium for enzymatic activities that is needed for growth.
  1. a - 3, b - 1, c - 2
  2. a - 2, b - 1, c - 3
  3. a - 1, b - 3, c - 2
  4. a - 1, b - 2, c - 3
  5. a - 3, b - 2, c - 1
Question 11 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. Heterophylly in cotton and coriander is an example of plasticity.
b. Cells positioned away from root apical meristems differentiate as root-cap cells.
c. The growth of the given system per unit time expressed as per unit initial parameter is called the absolute growth rate.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only c
  5. Only b and c
Question 12 Multiple Choice (Single Answer)

Match the following:

</strong
Plant growth regulators Examples
a. Adenine derivative 1. Abscisic acid
b. Derivative of carotenoids 2. Kinetin
c. Terpenes 3. Gibberellic acid
  1. a - 3, b - 1, c - 2
  2. a - 3, b - 2, c - 1
  3. a - 1, b - 2, c - 3
  4. a - 2, b - 1, c - 3
  5. a - 2, b - 3, c - 1
Question 13 Multiple Choice (Single Answer)

The rise in rate of respiration during the ripening of fruits is called respiratory climacteric. Which of the following plant growth regulators is responsible for this?

  1. Ethylene
  2. Abscisic acid
  3. Gibberellin
  4. Cytokinin
  5. Auxin
Question 14 Multiple Choice (Single Answer)

Growth is measured by a variety of parameters. In a single maize root apical mersitem, growth is expressed as the

  1. increase in size of the cell
  2. increase in fresh weight
  3. increase in surface area
  4. increase in cell number
  5. increase in length
Question 15 Multiple Choice (Single Answer)

Which of the following is not a use of auxins?

  1. Auxins are widely used as herbicides.
  2. Auxins help prevent fruit and leaf drop at early stages.
  3. Auxins promote flowering.
  4. Auxins delay senescence.
  5. Auxins help in initiating rooting in stem cuttings.
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