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Transpiration — Biology STD 10 — Question

ICSE BoardEnglish MediumSTD 10BiologyTranspiration3 Marks
Question
Study the diagram given below and answer the questions that follow:

(i) Name the process being studied in the above experiment.
(ii) Explain the process mentioned in (i) above.
(iii) Why is oil placed over water?
✓

Answer

(i) Transpiration
(ii) It is the process by which plants lose water as vapours through the aerial parts.
(iii) To prevent evaporation of water from the test tube.
(iv)

  1. In bright sunlight, the level of water decreases quickly.
  2. In humid conditions level of water does not decrease for a long time.
  3. On a windy day, the level of water decreases very quickly.

(v)

  1. The number of stomata may be reduced.
  2. leaves may become narrow.
  3. A thick layer of cuticle on the leaf surface helps to decrease transpiration

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