Transpiration — Homi Bhabha Class 6 Biology MCQs with Solutions
Free Homi Bhabha Class 6 Biology Transpiration MCQs with step-by-step solutions (8 questions). Part of Plant Anatomy & Functions. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Transpiration · easy · theory
The loss of extra water from a plant in the form of water vapour is called …
A. Photosynthesis
B. Germination
C. Pollination
D. Transpiration ✓ Correct
Solution: When a plant gives out its extra water as vapour into the air, this process is called transpiration.
Q2 — Transpiration · easy · theory
Most of the water lost by a plant during transpiration escapes from its …
A. Roots
B. Flowers
C. Leaves ✓ Correct
D. Woody stem
Solution: Leaves have many tiny pores (stomata), so most of the plant’s water vapour is lost from the leaves.
Q3 — Transpiration · easy · theory
On which day would a plant usually lose water by transpiration the fastest?
A. A cool, cloudy day
B. A hot, sunny day ✓ Correct
C. A rainy day
D. A cold winter night
Solution: Heat and sunshine make water evaporate faster, so a plant transpires most quickly on a hot, sunny day.
Q4 — Transpiration · medium · theory
A leafy plant is covered with a clear plastic bag on a sunny day, and later tiny water drops appear inside the bag. Where did this water come from?
A. The soil jumped up
B. Rain came in from outside
C. The plastic melted into water
D. The leaves gave out water vapour ✓ Correct
Solution: The leaves released water vapour by transpiration, which cooled on the plastic and collected as tiny water drops inside the bag.
Q5 — Transpiration · medium · theory
During transpiration, water vapour leaves the plant mainly through the tiny leaf pores called …
A. Roots
B. Stomata ✓ Correct
C. Veins
D. Petals
Solution: The same stomata that let gases move in and out of a leaf also allow water vapour to escape during transpiration.
Q6 — Transpiration · medium · numerical
A small plant loses about 2 mL of water by transpiration every hour. How much water will it lose in 5 hours?
A. 7 mL
B. 25 mL
C. 3 mL
D. 10 mL ✓ Correct
Solution: Multiply the water lost each hour by the number of hours: 2 × 5 = 10 mL.
Q7 — Transpiration · hard · theory
Why does a plant transpire much more on a hot and windy day than on a still, cool day?
A. Cold makes water leave faster
B. Heat and wind make water evaporate faster from the leaves ✓ Correct
C. The leaves drink extra water
D. The wind pushes water into the roots
Solution: Warmth speeds up evaporation and wind carries the water vapour away quickly, so both make the plant transpire faster.
Q8 — Transpiration · hard · theory
Besides removing extra water, transpiration also helps the plant by …
A. Cooling it down, just as sweating cools our body ✓ Correct
B. Colouring the leaves green
C. Stopping water from reaching the roots
D. Making the plant heavier
Solution: As water vapour escapes it carries away heat, so transpiration cools the plant much like sweating cools our skin.