Question

Angiosperms have dominated the land flora primarily because of them
a) Domestication by man
b) Power of adaptability in diverse habitat
c) Property of producing large number of seeds
d) Nature of self-pollination

Answer 1

Hint: Angiosperms are flowering plants which are highly vascularized seed plants and its egg develops into a seed from the ovary. Angiosperms have dominated the land like other plants, gymnosperms which are enclosed and have reproductive structures as cones. Their tissues are specialized to transport water and nutrients through xylem and phloem.

Complete answer-
a) Domestication by man- angiosperms are highly evolved plants. They are found in adventitious roots and swampy areas.
Option A is not the correct answer.
b) Power of adaptability in diverse habitats- their roots have special modifications which can suit any climate and protect them from adverse conditions too. Their root system has both an adventitious and tap root system.
Option B is the correct answer.
c) Property of producing large number of seeds- angiosperms sex organs are highly developed, and they attract pollinators at different time and places. They are used for insect pollination and wind pollination as well.
Option C is not the correct answer.
d) Nature of self-pollination- self-pollination is not a characteristic of angiosperms as they require pollinators for attracting insects and thus, pollination occurs. Seeds are more protected inside the ovary.
Option D is not the correct answer.

Hence, Option b) is the correct answer.

Note:
Examples of angiosperms include magnolia trees, roses, tulips and tomatoes. The difference between gymnosperms and angiosperms develops in the ovaries of flowers and is surrounded by protective fruit. Gymnosperm whereas is unisexual cones known to be strobili and they lack both fruits and flowers. Angiosperms have vessels.