Q9 of 57 Page 75

What are monocotyledons and dicotyledons? Give examples.

Monocotyledons: - Seeds with single cotyledon are known as monocotyledon. E.g. maize, rice etc. Their leaf have parallel venation.

Dicotyledons: - Seeds with two cotyledons are known as dicotyledons or dicots. E.g. Bean etc. Their leaf generally have reticulate venation.



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7

Name the events (i) & (ii) and mention the nature of the nuclear structures formed at the end in the following cases:

(i) male gamete (n) + egg (n) = Zygote (2n)


(ii) male gamete (n) + secondary nucleus (2n) = Endosperm nucleus (3n).


 8

Differentiate dehiscent fruits and indehiscent fruits with suitable examples.

 10

Give suitable terms for the following methods of seed / fruit dispersal, with one example each: (i) by wind (ii) by water (iii) by animals.

 11

Give any two examples for each of the following cases where dispersal of fruits and seeds take place: (i) by birds (through excreta) (ii) by human beings