a) Why does endosperm development precede development in angiosperm seeds? State the role of endosperm in mature albuminous seeds.
b) Describe with the help of three labelled diagrams the different embryonic stages that include mature embryo of dicot plants.

Why does endosperm development precede embryo development?

Endosperm development precedes embryo development, the endosperm of angiospermic plant is

Explain with the help of a diagram the development of a mature embryo sac from a megaspore mother cell in angiosperm.

Explain with the help of a diagram the development of a mature embryo sac from a megaspore mother cell in angiosperm

How does the pollen mother cell develop into a mature pollen grain? Illustrate the stages with labelled diagrams.

How does the pollen mother cell develop into a mature pollen grain? Illustrate the stages with labelled diagrams.

(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 gains entry into the embryo sac. (v) that attaches the ovule to the placenta. (b) Describe the characteristic features of wind pollinated flowers.

With a neat, labelled diagram, describe the parts of a mature angiosperm embryo sac. Mention the role of synergids.

Why does the zygote in angiosperms start developing into embryo only after some endosperm is formed?