Name the parts of an angiosperm flower in which development of male and female gametophyte take place.

Explain any three advantages that seeds offer to angiosperms.

Coconut palm is monoecious, while date palm is dioecious. Why are they so called?

Draw a sectional view of human ovary and label the different follicular stages, ovum and Corpus luteum.

(a) Draw a diagrammatic sectional view of a mature anatropous ovule and label the following parts in it:

(i) that develops into seed coat.

(ii) that develops into an embryo after fertilization.

(iii) that develops into an endosperm in an albuminous seed.

(iv) through which the pollen tube grains entry into the embryo sac.

(v) that attaches the ovule to the placenta.

Mention the unique flowering phenomenon exhibited by Strobilanthus kunthiana (neelakuranaji). 

Where is sporopollenin present in plants? State its significance with reference to its chemical nature. 

89. Normally one embryo develops in one seed but when an orange seed is squeezed many embryos of different shapes and sizes are seen. Mention how it has happened.

Differentiate between albuminous and non-albuminous seeds, giving one example of each.