Plant Reproduction and Germination

Cotyledons are called seed leaves.

In angiosperms, it is the central portion of the ovule in which the embryo sac develops. In some cases of apomixis (production of seeds without fertilisation), cells of the nucellus develop into an embryo. Perisperm is a mass of nutritive material that is outside the embryo sac.

Poor quality seeds are hollow and light. Good quality seeds are clean and healthy.

Correct Answer: morning

Bryophytes lack seeds and vascular tissues.

Pteridophytes do not produce seeds.

Seeds of angiosperms are enclosed within the fruits.

Cotyledons are also called seed leaves.

If seeds sense light, they will germinate using their Pfr form. Pfr absorbs at a peak of 730 nm. The Pfr form is the active form that initiates biological responses. When Pfr absorbs far red light, it is converted to the Pr form.

The word "gymnosperm" comes from the Greek word gymnospermos, meaning "naked seeds". In these, the ovules or seeds are not enclosed in an ovary.

Seed dormancy is defined as a state in which seeds are prevented from germinating even under environmental conditions normally favourable for germination. The torpedo-shaped seed of a mangrove (Rhizophora maritima) is an exception. It germinates while still on the mother plant. When they fall, seed penetrates securely into soft mud flats.

Plumule is called future shoot of a germinating seed.

The development of seedless fruit in an unfertilised flower is called parthenocarpy.

Double fertilisation means the fusion of one male gamete with the egg and the other with the antipodal cell.

A loment (or lomentum) is a type of indehiscent legume fruit that breaks apart at constrictions occurring between segments, so that each segment contains one seed.