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PUCET (Punjab) Transpiration — practice questions

Explore 2 free Transpiration questions in PUCET (Punjab) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Transpiration questions and exercises with answers

Showing questions 1–2 of 2.

**Transpiration** is the loss of water from the plant in the form of:Read the answer and worked solution →**Stomatal transpiration** accounts for what fraction of total transpiration?Read the answer and worked solution →

Worked practice questions

**Transpiration** is the loss of water from the plant in the form of:

  1. Liquid (through hydathodes)
  2. Vapour, mainly through stomata, cuticle and lenticels
  3. Both A and B equally
  4. Only through roots
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Correct answer: B. Vapour, mainly through stomata, cuticle and lenticels

Transpiration = evaporative water loss (vapour). 90–93% via stomata; 8–10% via cuticle; 0.1–1% via lenticels. Loss as liquid through hydathodes is called guttation (a separate process).

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**Stomatal transpiration** accounts for what fraction of total transpiration?

  1. ~10%
  2. ~50%
  3. ~90% (and occurs only during daytime when stomata open)
  4. ~99%
Show answer and solution

Correct answer: C. ~90% (and occurs only during daytime when stomata open)

Stomatal transpiration = 90–93% of total transpiration, occurring only during the day (most plants). Desert CAM plants are an exception — stomata open at night.

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