Science M.C.Q. [I MARKS]

Snake, fish and frog are oviparous animals whereas rat is viviparous animals.

Fertilization takes place in the fallopian tube.

The larva of a frog is tadpole.

Egg/ova is the female gamete. It fuses with the male gamete, sperm to form zygote.It is produced by the ovaries.

Ovary has graafian follicles.

In Hydra, reproduction takes place by budding. A small part of the body of an organism grows as ‘bud’ which then detaches and becomes a new organism.
The other options Amoeba, Paramecium and bacteria reproduce asexually by binary fission.

Unicellular organisms like amoeba and paramoecium undergoes binary fission.

After fertilisation (i.e. combining of sperm with the egg), zygote is formed. It is the beginning of formation of a new individual. All the multicellular animals start their life from a single cell called zygote.

Fertilization is external in fish and amphibians.

Internal fertilisation takes place in a very large number of animals such as humans, cows, dogs, cats, tigers, lions, birds, reptiles, insects etc., but not in frog, fish and star fish.

One ova is released at a time in female human beings.

Placenta is a specialized structure that provides nourishment to the foetus from the mother and collects wastes from it, passing them onto the mother.

The transformation of the larva into an adult through drastic changes is called metamorphosis. Frogs, butterflies, silkworm, etc., undergo metamorphosis.

The process by which male and female gametes fuse to each other is called fertilization.

Viviparous animals give birth to their young ones. Cat is an example of an animal that gives birth to it's young ones. On the other hand, hen, fish and cobra lay eggs and are termed as oviparous animals.

Two types

The aquatic animals in which fertilization takes place in water, lay unfertilized eggs and fertilization takes place when male gametes, already present in water, float up to them and fuse. Thus, these animals are oviparous as they lay eggs, and exhibit external fertilization as the fusion of male and female gametes takes place outside the body of an organism.

Foetus

Female gamete in humans is called ova/egg. It is produced by the ovaries. The male gamete called sperm fuses with the egg to form a zygote.

The process of transformation of young ones into adult while undergoing drasticchanges is called metamorphosis. Butterfly, frogs, silkworm, etc., are examples of animalsthat undergo metamorphosis.

The mass of eggs of a frog is called spawn.

In sexual reproduction such as humans, two parents are required. In case of plants, male and female reproductive parts are required.

Protozoa reproduces asexually.

Scrotum, epididymis and seminal vesicle are parts of male reproductive system while Fallopian tube is a part of female reproductive system. Uterus, cervix and vagina are parts of female reproductive system while testis is the part of male reproductive system. Cow, dog and cat are examples of viviparous animals while sparrow is an example of oviparous animal.

The given figure represents fertilization.

The offspring formed as a result of sexual reproduction exhibits more variations because genetic material comes from two parents of same species.

Ovary is a part of the female reproductive system. All other given options are partsof male reproductive system. Penis is the external genital organ in males. Testes are the mainreproductive organs in males and produce sperms. Vas deferens carry semen from testes tothe urethra for ejaculation.