Q2 of 44 Page 1

Name the host where fertilisation occurs in the life cycle of Plasmodium.

The host where fertilisation occurs in Plasmodium are:


I. Human blood


II. Female Mosquito’s intestine


The life cycle of plasmodium includes two phases, namely Asexual and Sexual which are completed in two different hosts.The sexual phase of the life cycle is completed in the Female Anopheles mosquito and the asexual phase is completed in Human beings.


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25

(a) Explain the development of female gametophyte from a megaspore mother cell in an angiosperm.

(b) Draw a labelled diagram of a fully developed embryo sac.


OR


(a) Draw a diagrammatic sectional view of a seminiferous tubule (enlarged) of human male and label (i) Spermatogenium, (ii) Sertoli cell, (iii) Primary spermatocyte. Write the function of each labelled part.


(b) Differentiate between spermatogenesis and spermiogenesis.


 1

Name the two enzymes that are essential for constructing a recombinant DNA.

 5

Provide an example each of single celled organisms which reproduce by :

(i) binary fission


(ii) budding


 7

For a layman, both apples and mangoes are ‘fruits’. Do you agree ? Give reasons in support of your answer.