Question

21) Water hyacinth float on water surface ? Why?
22) If a potted plant is covered with a glass jar, water vapours appear on the wall of glass jar. Explain, why?
23) Define process of differentiation?
29) Usually herbs and shrubs grow in open places and are grow in open places and are exposed to
forcefulwinds. But they do not break. Why?
25) What are the constituents of phloem?​

Answer 1

Answer:

21) Water hyacinth have spongy leafs and aerenchyma due to which it floats on water.

22) Water vapours appear on wall of glass due to Transpiration process.

Transpiration process is a loss of water from stomata.

23)The processes by which distinct cell types arise from precursor cells and become different from each other is called differentiation.

24) Because of collenchyma which gives elasticity to stem.

25) Sieve tubes, Companion cells, Phloem fibres & Phloem parenchyma are constituents of Phloem.