Question

(a) Draw a diagrammatic sectional view of a mature anatropous ovule and label the following parts in it.
(i) That develops into the 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 gain 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)The part that develops into seed coat— Integument ii. The part that develops into an embryo after fertilization — Embryo sac iii. The part that develops into an endosperm in an albuminous seed — Nucellus iv. The part through which the pollen tube gains entry into the embryo sac — Micropyle v. The part that attaches the ovule to the placenta— Funicle

Figure : Anatropous ovule

b) The characteristic features of wind-pollinated flowers.

• Pollen grains are light, dry, and nonsticky.
• The flower produces a large number of pollen grains.
• Open flowers with well-exposed stamen so that pollen can easily be dispersed.
• Flowers have a large and feathery stigma.