Vidaara.orgClass 11 · Mathematics
CodeVID-M11-WS
Plant Growth and Development — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
15 × 1 = 15 marks
1.
Growth is best defined as a/an:
- A.Reversible decrease in size
- B.Irreversible increase in size
- C.Change in colour
- D.Loss of weight
2.
Plant growth continues through life because of regions called:
- A.Stomata
- B.Meristems
- C.Lenticels
- D.Stomatal pores
3.
The three phases of growth at the cell level are division, enlargement and:
- A.Maturation
- B.Respiration
- C.Transpiration
- D.Fertilisation
4.
A typical growth curve is:
- A.S-shaped (sigmoid)
- B.A straight line
- C.A circle
- D.Flat
5.
The process by which cells become specialised is:
- A.Differentiation
- B.Respiration
- C.Osmosis
- D.Diffusion
6.
The hormone that promotes cell elongation and apical dominance is:
- A.Auxin
- B.Ethylene
- C.Abscisic acid
- D.Cytokinin
7.
Which hormone helps dwarf plants grow tall and breaks seed dormancy?
- A.Gibberellin
- B.Abscisic acid
- C.Ethylene
- D.Auxin
8.
Cytokinins mainly promote:
- A.Cell division and delay ageing
- B.Fruit ripening
- C.Stomatal closure
- D.Seed dormancy
9.
The gaseous plant hormone is:
- A.Auxin
- B.Ethylene
- C.Gibberellin
- D.Cytokinin
10.
The main growth inhibitor and 'stress hormone' is:
- A.Auxin
- B.Cytokinin
- C.Abscisic acid
- D.Gibberellin
11.
Apical dominance means the shoot tip:
- A.Suppresses the growth of side branches
- B.Stops root growth
- C.Causes flowering
- D.Closes stomata
12.
Response of plants to the length of day and night is:
- A.Photoperiodism
- B.Vernalisation
- C.Geotropism
- D.Hydrotropism
13.
Plants that flower only when days are shorter than a critical length are:
- A.Long-day plants
- B.Short-day plants
- C.Day-neutral plants
- D.Aquatic plants
14.
The plant part that senses day length is the:
- A.Root
- B.Leaf
- C.Flower
- D.Fruit
15.
Promotion of flowering by exposure to cold is:
- A.Vernalisation
- B.Photoperiodism
- C.Senescence
- D.Abscission
Section B — Challenge / Olympiad (2 marks each)
6 × 2 = 12 marks
16.
Removing the shoot tip of a plant makes the side branches grow more. This is because the tip normally supplies:
- A.Auxin, which causes apical dominance
- B.Ethylene, which ripens fruit
- C.ABA, which closes stomata
- D.Cytokinin only
17.
Storing unripe bananas with a ripe apple speeds up their ripening because the apple releases:
- A.Ethylene gas
- B.Auxin
- C.Abscisic acid
- D.Gibberellin
18.
During a drought, a plant's stomata close mainly due to a rise in:
- A.Abscisic acid
- B.Auxin
- C.Gibberellin
- D.Cytokinin
19.
A short-day plant kept under long days will most likely:
- A.Fail to flower
- B.Flower earlier
- C.Die immediately
- D.Grow no leaves
20.
Winter wheat sown in spring without a cold spell does not flower well. This shows the need for:
- A.Vernalisation
- B.More auxin
- C.Less light
- D.Higher temperature
21.
The fact that a single plant can grow differently shaped leaves underwater and in air illustrates:
- A.Plasticity
- B.Apical dominance
- C.Vernalisation
- D.Senescence
Answer Key
Section A — Multiple Choice (1 mark each)
- (B) Irreversible increase in size
- (B) Meristems
- (A) Maturation
- (A) S-shaped (sigmoid)
- (A) Differentiation
- (A) Auxin
- (A) Gibberellin
- (A) Cell division and delay ageing
- (B) Ethylene
- (C) Abscisic acid
- (A) Suppresses the growth of side branches
- (A) Photoperiodism
- (B) Short-day plants
- (B) Leaf
- (A) Vernalisation
Section B — Challenge / Olympiad (2 marks each)
- (A) Auxin, which causes apical dominance
- (A) Ethylene gas
- (A) Abscisic acid
- (A) Fail to flower
- (A) Vernalisation
- (A) Plasticity
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