Question

How many of the following statements are valid to angiosperms?
I. The ovules mature into seeds, whereas the ovaries develop into the fruits.
II. The primary endosperm nucleus, which is present in the embryonic sac, is diploid.
III. Stamen is the male reproductive part of a flower.

• A. Only I
• B. I and II
• C. I and III
• D. I, II and III

Answer 1

The correct option is C I and III

The angiosperms are flowering plants. The male sex organ in flower is the stamen, consisting of a narrow stalk called filament and a knob-like broader tip called the anther. Each anther consists of four pollen sacs or microsporangia.

Angiosperms show double fertilization. Out of the two male gametes released into the embryonic sac, one male gamete fuses with the egg cell (female gamete) to form a diploid zygote. The other male gamete fuses with the diploid secondary nucleus forming a triploid primary endosperm nucleus (PEN), known as triple fusion, because endosperm is a product of the fusion of three haploid nuclei.

After fertilization, ovules develop into seeds and ovary into fruit.