Q19 of 30 Page 1

Draw a diagram of a male gametophyte of an angiosperm. Label any four parts. Why is sporopollenin considered the most resistant organic material?

This is a diagrammatic representation of male gametophyte of angiosperms (pollen grain).


Sporopollenin is a complex biopolymer compound found in the outer exine layer of the male gametophyte. It is chemically very stable and is non degradable by any enzyme or chemical compound.


More from this chapter

All 30 →
17

Study the graph given below. Explain how is oxygen concentration affected in the river when sewage is discharged into it.


 18

Explain how a hereditary disease can be corrected. Give an example of first successful attempt made towards correction of such diseases.

 20

How are dominance, codominance and incomplete dominance patterns of inheritance different from each other?

 21

The base sequence in one of the strands of DNA is TAGCATGAT.

(i) Give the base sequence of its complementary strand.


(ii) How are these base pairs held together in a DNA molecule?


(iii) Explain the base complementarity rules. Name the scientist who framed this rule.