Plant Reproduction and Germination

This is the correct answer. The outer hard cover of a seed is called seed coat. Beneath the seed coat, there are the seed leaves called cotyledones. The food required to keep the embryo alive is in the cotyledon. The seed carries an embryo inside. It  carries the basic parts, which are the plumule and the radicle.

Sunlight is necessary for the growth of plants. It is not an agent of dispersal.

This is the correct answer. Coconut seed is dispersed through water. It has a thick fibrous covering around its seeds that help them to float. Hydrilla is a water plant and it uses water to disperse its seeds.

Both these statements are correct. Plants reproduce in different ways. A seed germinates under certain conditions. It needs water, warmth and air to germinate.

This is the correct answer because all of these are seeds.

Ans - 4

crackers bursting is so fast

 Cryptogams are plants with hidden reproductive organs.

 Gymnosperms bear naked seeds. So, option (3) is correct.

The pollination of anther through water is called hydrophily.It can occur in one of two ways. Either the pollen grains themselves are carried on or under the surface of the water, or the male flowers break off and float along until they come into contact with a female flower.

Cotyledon stores food in germinating seed.Species with one cotyledon are called monocotyledonous ("monocots") and Plants with two embryonic leaves are termedas dicotyledonous.

Bryophyta produces spores and embryo, but lacks vascular tissues and seeds. They are amphibians of plant kingdom.

Gymnosperms are evergreen and woody plants. This plant group has seeds, but they lack flowers and fruits. Angiosperms are the flowering plants.

Central cell is the largest cell of embryo sac and is the mother cell of endosperm. The enlargement of the embryo sac after the last nuclear division is largely due to inflation of the large central vacuole of central cell.

Pollen grain is the mother cell of male gametophyte. Development of male gametophyte begins inside themicro sporangium. The microspore nucleus divide mitotically to form a smaller generative cell and a much larger, vegetative cell (tube cell). The generative cell produces two male gametes, whereas, the vegetative cell form pollen tube after pollination. Pollen grain contains two cells, i.e., tube cell and generative cell at the time of pollination.