WBBSE Class 9 Life Science MCQ Questions Chapter 3.1C Transpiration

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Well structured WBBSE Class 9 Life Science MCQ Questions Chapter 3.1C Transpiration can serve as a valuable review tool before exams.

Transpiration Class 9 WBBSE MCQ Questions

Multiple Choice Questions :

Question 1.
During transpiration, plants release-
(A) Water from the body
(B) Excess water as vapour
(C) Only CO2
(D) Water and CO2
Answer:
(B) Excess water as vapour

Question 2.
Transpiration occurs through-
(A) Stomata of leaves
(B) Lenticels of stem
(C) Cuticle of leaves
(D) All of these
Answer:
(D) All of these

Question 3.
Maximum transpiration occurs through-
(A) Stomata
(B) Cuticle
(C) Lenticels
(D) Cracks on the plant surface
Answer:
(A) Stomata

WBBSE Class 9 Life Science MCQ Questions Chapter 3.1C Transpiration

Question 4.
Rate of transpiration is-
(A) Inversely proportional to the intensity of light
(B) Directly proportional to the humidity of atmosphere
(C) Directly proportional to the intensity of light
(D) Inversely proportional to the rate of water absorption
Answer:
(C) Directly proportional to the intensity of light

Question 5.
The scientist who said that “transpiration is a necessary evil”-
(A) Curtis
(B) Barnes
(C) Woodland
(D) Calvin
Answer:
(A) Curtis

Question 6.
Stoma remains guarded by a pair of-
(A) Guard cells
(B) Companion cells
(C) Sclerenchymatous cells
(D) Sieve cells
Answer:
(A) Guard cells

Question 7.
Increase in CO2 concentration in the atmosphere-
(A) Increases transpiration
(B) Decreases transpiration
(C) Has no role in transpiration
(D) Stops transpiration
Answer:
(B) Decreases transpiration

Question 8.
increase in atmospheric temperature-
(A) Increases transpiration
(B) Decreases transpiration
(C) Shows no significant change in transpiration
(D) Has no role in transpiration
Answer:
(A) Increases transpiration

WBBSE Class 9 Life Science MCQ Questions Chapter 3.1C Transpiration

Question 9.
Very high temperature (above 35° C)-
(A) Increases the rate of transpiration
(B) Decreases the rate of transpiration
(C) Shows no change in the rate of transpiration
(D) Stops transpiration
Answer:
(B) Decreases the rate of transpiration

Question 10.
Higher rate of transpiration needs-
(A) Sudden gusty wind
(B) Continuous hot air flow
(C) Steady moist wind flow
(D) All of these
Answer:
(B) Continuous hot air flow

Question 11.
During hot summer noon, herbaceous plants wilt because of–
(A) Short food production
(B) Evaporation
(C) Excess transpiration
(D) Lower ascent of sap
Answer:
(C) Excess transpiration

Question 12.
A plant shows higher rate of transpiration, which has-
(A) Wider leaves
(B) Fewer leaves
(C) Finer leaves
(D) Leaves with cuticle
Answer:
(A) Wider leaves

WBBSE Class 9 Life Science MCQ Questions Chapter 3.1C Transpiration

Question 13.
Transpiration occurs at night in plant.
(A) Mango
(B) Sugarcane
(C) Aloe vera
(D) Colocasia (Arum)
Answer:
(C) Aloe vera

Question 14.
Desert plants perform transpiration preferably-
(A) At morning
(B) At dusk
(C) At afternoon
(D) At night
Answer:
(D) At night

Question 15.
Normal transpiration makes a plant-
(A) Weak
(B) Cool
(C) Fresh
(D) Dry
Answer:
(B) Cool

Question 16.
Which of the following leaves performs transpiration most efficiently?
(A) Pine leaf
(B) Arum leaf
(C) Paddy leaf
(D) Grass leaf
Answer:
(B) Arum leaf

WBBSE Class 9 Life Science MCQ Questions Chapter 3.1C Transpiration

Question 17.
The cells which are present around the guard cells are called-
(A) Epithelial cells
(B) Sclerenchyma cells
(C) Prosenchyma cells
(D) Subsidiary cells
Answer:
(D) Subsidiary cells

Question 18.
Which of the following leaves shows least rate of transpiration?
(A) Banana leaf
(B) Rose leaf
(C) Cactus leaf
(D) Apple leaf
Answer:
(C) Cactus leaf

Question 19.
The rate of transpiration through cuticle is about $\%$ of the total transpiration by plants.
(A) 0.1
(B) 10
(C) 90
(D) 100
Answer:
(B) 10

Question 20.
In which type of leaves does maximum rate of transpiration occur?
(A) Tender leaf
(B) Fully grown leaf
(C) Aged leaf
(D) Dry leaf
Answer:
(B) Fully grown leaf

WBBSE Class 9 Life Science MCQ Questions Chapter 3.1C Transpiration

Question 21.
Guard cells are shaped.
(A) Oval
(B) Square
(C) Bean
(D) None of these
Answer:
(C) Bean

Question 22.
The opening and closing of stomatal pore is controiled by cells.
(A) Mesophyll
(B) Spongy
(C) Guard
(D) None of these
Answer:
(C) Guard

Question 23.
The essential element which controls the rate of transpiration is-
(A) Potassium
(B) Iron
(C) Boron
(D) Manganese
Answer:
(A) Potassium

Question 24 .
The hormone, which helps in the closing of stomatal pore, is-
(A) Auxin
(B) Abscisic Acid (ABA)
(C) Cytokinin
(D) Indole Acetic Acid (IAA)
Answer:
(B) Abscisic Acid (ABA)

WBBSE Class 9 Life Science MCQ Questions Chapter 3.1C Transpiration

Question 25.
Highest rate of transpiration occurs in-
(A) Hot and humid climate
(B) Cold and dry climate
(C) Cold and moist climate
(D) Hot and dry climate
Answer:
(D) Hot and dry climate

Fill in the blanks :

  1. Minimum rate of transpiration occurs through ____.
  2. ____ ions help in the opening of stomata.
  3. Xerophytic plants possess _____ stomata.
  4. In dorsiventral leaves, maximum number of stomata is seen on the ____ side.
  5. ____ is an example of anti-transpirant.
  6. In airy environment, rate of transpiration ____.
  7. A thin and porous cuticle _____ transpiration rate.
  8. _____ is a slow and controlled process in plants.
  9. Drooping of plant, due to excess transpiration is called _____.

Answer:

  1. Lenticels
  2. Potassium
  3. Sunken
  4. Ventral ABA
  5. Abscisic acid
  6. Increases
  7. Enhances
  8. Transpiration
  9. Wilting

State true or false :

  1. Ganong’s potometer is used to measure the rate of respiration.
  2. Sunken stomata are seen in evergreen plants.
  3. Plants give out excess water as vapours by a process called evaporation.
  4. Transpiration is a physiological process.
  5. Excess transpiration causes wilting of plants.
  6. Maximum rate of transpiration occurs through cuticle.
  7. Relative humidity is one of the main controlling factors of evaporation.

Answer:

  1. False
  2. False
  3. False
  4. True
  5. True
  6. False

WBBSE Class 9 Life Science MCQ Questions Chapter 3.1C Transpiration

Match the columns :

Question 1.

Left column Right column
1. Maximum transpiration A. Lenticel
2. Lens-shaped pores on bark B. Cuticle
3. Guttation C. Stomata
4. Waxy coating on leaves D. Spine
E. Hydathode

Answer:

Left column Right column
1. Maximum transpiration C. Stomata
2. Lens-shaped pores on bark A. Lenticel
3. Guttation E. Hydathode
4. Waxy coating on leaves B. Cuticle

WBBSE Class 9 Life Science MCQ Questions Chapter 3.1C Transpiration

Question 2.

Left column Right column
1. Physical process A. Guttation
2. Photochemical process B. Wilting
3. Water disposal through hydathodes C. Respiration
4. Drooping of plant D. Evaporation
E. Photosynthesis

Answer:

Left column Right column
1. Physical process D. Evaporation
2. Photochemical process E. Photosynthesis
3. Water disposal through hydathodes A. Guttation
4. Drooping of plant B. Wilting

 

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