Reproduction in Animals Test - 4

Reproduction without the fusion of gametes is known as asexual reproduction. The offspring are genetically identical. This type of reproduction in which only a single parent is involved is called asexual reproduction.

Reproduction not only occurs in plant but in several other organisms as well like Hydra. Amoeba etc.

Butterflies undergo sexual reproduction. Like most of the organism; in case of Butterflies reproduce the way other animals do; sperm from a male fertilizes eggs from a female. On the other hand, the mode of reproduction in Hydra is asexual and the process is called budding. The process of binary fission occurs in Amoeba; which is an asexual mode of production.

Thus option D is the correct answer.

The fertilization that occur outside of the body, and is called external fertilization. Many fish, amphibians, and other sexual aquatic animals use external fertilization (the exceptions are aquatic mammals, sharks, and some other special types of fish). Thus option D is the correct answer.

A tadpole (also called a pollywog) is the larval stage in the life cycle of an amphibian, particularly that of a frog or toad. They are usually wholly aquatic, though some species have tadpoles that are terrestrial as well.

Hence, option B is the correct answer.

In the case of tadpoles, they transform into adults capable of jumping and swimming. The transformation of the larva into an adult through drastic changes is called metamorphosis.

Reproduction is the phenomenon which involves the production of an offspring by particular individual or individuals to propagate their species. Reproduction is done during reproductive phase. There are namely two types of reproduction process; sexual reproduction and asexual reproduction.

Unicellular organisms reproduce by asexual means. This asexual mode of reproduction involves single parent to produce their offspring. Different types of asexual modes of reproduction include binary fission, multiple fission, fragmentation, budding etc.

Thus the statement in option A is incorrect.

Ovaries, testes and the fallopian tubes are the paired structures in human reproductive system. Thus option D is the correct answer.

The testes produce the male gametes called sperms. Millions of sperms are produced by the testes. Though sperms are very small in size, each has a head, a middle piece and a tail.

Hence option C is the correct answer.

Placenta prevents the mixing of the blood of the fetus with that of the mother. The placenta is an organ that develops in your uterus during pregnancy. This structure provides oxygen and nutrients to your growing baby and removes waste products from your baby's blood.

Hence option D is the correct answer.