Question

During the adverse season, therophytes survive through
(a) Seeds
(b) Bulbs
(c) Rhizomes
(d) Corms

Answer 1

Therophytes are plants found in arid regions and deserts. Under favourable environmental conditions they usually complete their life cycle in a short time. They live through the adverse season with the help of embryonic plants. When the season returns favourable, they germinate into a new plant.

Complete step by step answer:
Therophytes have a short life-span and are annual plants. They are summer plants which form seeds in order to survive in adverse conditions. All parts of these plants die in summer except seed. Thus these plants withstand difficult conditions.
Being a plant that rapidly completes its life cycle during times when conditions such as spring and autumn are favourable and survives unfavourable conditions as a seed during the winter and summer (e.g. cold, heat, or competition) . It is thus an annual or ephemeral plant.In desert environments and cultivated land, therophytes are very usual.
Bulbs are the alteration of underground roots. They consist of a discoid stem that is reduced and many fleshy scales.
Tubers are the swollen underground stem that grows at a branch's rising tip.
Rhizomes below the surface of the soil are perennial, fleshy and dorsiventral.
So, the correct answer is, ‘(a) Seeds’.

Note : Seeds are small embryonic plants that are contained in a covering called the seed coat, usually with some food stored. Seeds protect the embryo or young plant and nourish it. The majority of therophytes are of Mediterranean origin and are typical of the northern hemisphere's deserts, semi-deserts, and southern steppes, which include many Cruciferae and Papaveraceae. Therophytes in the forest zone are primarily represented by field weeds, e.g. cornflower, pennycress, and stork's-bill.