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BIOLOGY CH24 Environmental Science — Science STD 9 — Question

Tamilnadu BoardEnglish MediumSTD 9ScienceBIOLOGY CH24 Environmental Science4 Marks
Question
List out the adaptations of xerophytes.
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Answer

  • The conditions that leads to adaptation of plants in a dry habitat are;
  1. To absorb as much water as they can get from the surroundings.
  2. To retain water in their organs for a very long time.
  3. To reduce the transpiration rate.
  4. To reduce consumption of water.
  • Adaptations of xerophytes:
  1. They have well-developed roots. Roots grow very deep and reach the layers where water is available as in Calotropis.
  2. They store water in succulent water-storing parenchymatous tissues, e.g. Opuntia, Aloe vera.
  3. They have small-sized leaves with a waxy coating, e.g. Acacia. In some plants, leaves are modified into spines, e.g. Opuntia.
  4. Some of the xerophytes complete their life cycle within a very short period when sufficient moisture is available.

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