(a) Draw a diagram of the structure of a human ovum surrounded by corona radiata. Label the following parts :
(i) Ovum, (ii) Plasma Membrane, (iii) Zona Pellucida
(b) State the function of Zona Pellucida.

Draw a diagram of internal structure of human heart and label the following: (i) Mitral valve (ti) Eustachius valve (iii) Chordae tendinae (iv) Pulmonary arch.

Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions. (a) Acrosome (b) Nucleus (c) Middle piece

(a)Draw a labelled diagram of internal structure of human heart. (b) What are chordae tendinae? Give their function.

Draw diagram of embryo sac and label the following: (i) Egg cell (ii) Polar Nuclei (iii) Synergids

(a) Draw a sectional view of human ovary. Label the following parts : (i) Primary follicle. (ii) Secondary oocyte. (iii) Graafian follicle. (iv) Corpus luteum. (b) Name the hormones influencing follicular development of corpus luteum.

(a) Draw a diagram of a mature embryo sac of an angiosperm and label the following parts in it : (i) Filiform apparatus (ii) Synergids (iii) Central cell (iv) Egg cell (v) Polar nuclei (vi) Antipodals (b) Write the fate of egg cell and polar nuclei after fertilization.