Question

(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.

Answer 1

(a)
(i) Inner and outer integument.
(ii) Egg cell.
(iii) Polar ruclei.
(iv) Micropyle.
(v) Funicle.
(b) (i) Pollen grains are light in weight, non-sticky, dry and winged.
(ii) Well-exposed stamens for easy dispersal of pollen grains in the wind.
(iii) The stigma is sticky, large and feathery to trap pollen grains floating in the air.
(iv) Numerous flowers are packed together to form inflorescence.