Science M.C.Q

The off springs formed by the method of asexual reproduction have greater similarity among themselves. This is because asexual reproduction involves only one parent and does not require gametes.

Plasmodium reproduces by multiple fission and causes malaria.

The anther produces pollen grains which are male gametes and the ovary produces ovules which are female gametes.

The ovary of a flower has ovules and the ovary of a human female has eggs.

Hepatitis is not a sexually transmitted disease.

Fertilisation is the fusion of two gametes in a sexual reproduction. It produces genetically different off springs and does not lead to the formation of clones.

Micropropagation is a tissue culture method of asexual reproduction in plants, which forms callus.

Amoeba, yeast and bacterium are unicellular organism that reproduce asexually.

Sexual reproduction in flowers requires two types of gametes, namely pollen grains and ovules. The fusion of the gametes results in the formation of the zygote. This process is termed as fertilisation.

In corals and sponges, the buds remain attached to their parents permanently, and form colonies.

when a female starts to menstruate, it indicates that she is sexually mature and can start her reproductive life.

The pollens are transferred to the stigma by pollination, the gametes then fuse and undergo fertilisation to form the zygote which develops into an embryo and, then, into a seed.

Hydra and Planaria reproduce through regeneration. They can regenerate fully from their cut body parts.

Off springs produced by sexual reproduction show similarities as well as variations with parents.

The oviduct is a part of the female reproductive system in humans.

Leishmania is the protozoan that has flagellum at its one end.

It reproduces by multiple fission.

Hydra is a tiny animal that has tentacles on one end, and reproduces by the method of budding.

The factors responsible for the rapid spreading of bread mould on slices of bread are the presence of a large number spores in air and the presence of moisture and nutrients in bread that act as food for the fungi.

Plants have sexual reproductive organs such as stamen and pistil. A fruit is formed after fertilisation in plants.

Scion is the upper part of the graft, which does not have roots.

The radicle of a seed forms the root after germination.

The genetically identical offsprings formed by asexual reproduction are called clones.

Genes carry the genetic information and are responsible for the transmission of characteristics from parents to off spring.

The gametes have half the number of chromosomes. After their fusion, the zygote thus formed has a full set of chromosomes. Therefore, the numbers of chromosomes in parents and offsprings of a particular species remain constant.

An anther contains male gametes called pollen grains.

Gametes of flowers fuse to form a zygote. This zygote develops into an embryo those later forms the seed.

Gonorrhoea is caused by bacteria, which spreads through sexual contact.

The exchange of nutrients, oxygen and waste products between the embryo and the mother's body takes place through the umbilical cord.

Yeast reproduces by budding.

Hydra can reproduce by the method of budding similar to yeast, and also by regeneration as in the case of Planaria.

The surgical method of birth control in females is termed as tubectomy.

It is a multicellular organism that reproduces by budding.

The ability of a cell to divide itself into several cells during reproduction is called multiple fission.

The vas deferens is a part of the male reproductive system in humans.

It reproduces by regeneration.

Fungi reproduce asexually through the formation of spores.

The sexual reproduction involves two parents of the same species.
Thus, both of them contribute to the genetic material of the offspring and bring about the variations.

In internal fertilisation, there is no need for the production of a large number of gametes as it provides a safe environment.

Asexual reproduction involves only one parent; therefore, the offsprings are genetically identical.

Yeast is the unicellular organism which reproduces by budding.

Hydra is a simple multicellular animal that has tentacles and lives in freshwater. It reproduces by budding.

It reproduces by the method of fragmentation in which the filament is broken down into small pieces.

It reproduces by regeneration.

Sperms are produced in the testis and then carried away by the vas deferens to the urethra.

Condom acts as a physical barrier during intercourse and protects a person from acquiring any sexually transmitted disease.

The development of the placenta and the secretion of oestrogen is done by human female body organs.

The testes lie outside the body in the scrotum because sperm production requires low temperature, which is provided by the scrotum.

Plasmodium, which causes malaria, reproduces by ​multiple fission.

Stock and scion are the two parts of a graft.

A zygote is formed by the fertilisation of the egg and a sperm cell.

In flowers, the anther produces pollen grains. In humans, the testes produces sperms.

Hydra is a multicellular organism. It reproduces by budding.

In Planaria, each body piece can regenerate into a full, new organism.

Stock is the lower part of the graft, which is fixed to the ground and has roots.

They reproduce asexually by the method of fragmentation.

In Spirogyra, reproduction takes place by fragmentation that involves breaking down the filaments into smaller bits.

Banana, yeast and Amoeba reproduce asexually. Banana reproduces by vegetative propagation, yeast propagates by the method of budding and Amoeba propagates by binary fission.

Pollen grains land on the surface of the stigma.
Hence, the pollen tube is formed so that the pollens can reach the ovules present in the ovary.

Reproduction provides the means of producing new off springs, so that a species can continue surviving on earth forever.

Yeast, Hydra, corals and sponges reproduce by budding.

Yeast is a fungus and is considered as a non green plant. It reproduces by budding.

Vasectomy is a surgical method of contraception that stops the sperms from reaching the ovum and thus, prevents pregnancy.

Cracking of voice in males is brought about by the male hormone testosterone, which is produced after sexual maturation.