Question

Application and Analysis
22. Few cells of plant tissue are known as collocytes. 31. Why are the surfaces of woody plants imperme-
Give their characteristic features.
able to water and gases?
23. What happens when the tree gets injured? Name
32. Young stems (twigs) bend but do not break. Why?
the structures responsible for that.
24. Why thickness of the stem increases as age advances
33. Why are inte-rvertebral discs considered to be the
in dicot plants?
strongest form of cartilages?
25. Why heartwood is considered more durable than
34. Mention the type of adipose tissue found in
the sapwood?
infants. How does it differ from adipose tissue of
adults?
26. Sieve tubes do not have nuclei, why are they con-
sidered as living cells?
35. Why is spleen known as haemopoietic and hae-
molytic tissue?
27. Cuticle is absent on epidermis of roots. Give reason.
28. Vascular tissue is responsible for survival of plants 36. Why do wrinkles appear on the skin with
in terrestrial conditions.
growing age?
29. Epidermal cells secrete thick and waxy layer in
37. Can a person survive if blood is completely drained
out from the body? Discuss.
cactus. Why?
30. Comment on the following statement.
38. In old people knees make a bit crunching sound
when they change their posture from sitting
One of the characteristic features of plant cell is
position to standing position. Why does this
the presence of vacuoles. But vacuoles are absent
happen?
in meristematic cells.
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Answer 1

Answer:

sorry,i don't know the answer .........

Answer 2

Answer:

which is your question

i will answer all or only one if one then which number bro??