Q7 of 43 Page 1

(a) You are given castor and bean seeds. Which one of the two would you select to observe the endosperm?

(b) The development of endosperm precedes that of embryo in plants. Justify.


a) The castor seed would be chosen to observe the endosperm. In bean seeds, the endosperm is completely absorbed at maturity.


b) The development of endosperm precedes that of embryo in plants because the function of the endosperm is to provide nourishment to the developing embryo.


More from this chapter

All 43 →
5

Give two reasons as to why a weed such a Calotropis flourishes in abandoned fields.

 6

Mosses and frogs both need water as a medium for fertilisation. Where does syngamy occur and how is it ensured in both these organisms?

OR


Write the basis of categorising animals as oviparous or viviparous, giving one example of each.


 8

A segment of DNA molecule comprises of 546 nucleotides. How many cytosine nucleotides would be present in it if the number of adenine nucleotides is 96?

 9

How is ‘somatic hybridization’ carried out? Mention one example of a somatic hybrid.