Question

classify the animals based on the development of embryo giving an example for each?

Answer 1

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POST FERTILIZATION - DEFINITION

After the process of fertilization the embryo divides mitotically to form multicellular embryo.The endosperm nucleus divides to form a mass of endosperm cells and provide nutrition to the developing embryo.

Many changes occur in the flower after the process of fertilization. A zygote is formed which is diploid in nature and later on forms a new plant

An ovary is transformed in a fruit and ovules in seeds.The integuments form the testa and seed coat. The antipodal cell and the synergids disintegrate.

The petals and the anthers fall off.

VIVIPAROUS AND OVIPAROUS ANIMALS - DEFINITION

Oviparous animals-

The animals which give birth to the young ones by laying eggs are called as Oviparous animals. The further embryonic development does not happen in the mothers body.

Oviparity is generally seen in birds and fishes.

Viviparous animals -

The animals in which all the stages of embryonic development takes place inside the body of an organism and give birth to their offsprings are called viviparous animals.

Viviparity is generally seen in mammals.

OVIPAROUS AND VIVIPAROUS ANIMALS -

DEFINITION

On the basis of development of an embryo, organisms are classified into two categories oviparous and viviparous.

Oviparous

Any organisms that reproduce by laying eggs and development of embryo occurs outside the parent body is called as oviparous e.g., birds.

Viviparous

Any organism that develops the embryo inside the female body e.g., fish, snakes, human, cow etc.