Reproduction produces new individuals of the same kind and ensures continuity of the species generation after generation.
In humans, sperms from the male reach the female reproductive tract and one sperm fuses with an egg in the oviduct. This fusion of male and female gametes forms a zygote, which begins development into an embryo.
- i. in female body
- ii. outside female body
- iii. in male body
- iv. outside male body
(i) in female body.
- i. fertilisation
- ii. metamorphosis
- iii. embedding
- iv. budding
(ii) metamorphosis.
- i. none
- ii. one
- iii. two
- iv. four
(ii) one.
(a) False (b) True (c) True (d) False (e) True (f) False (g) False (h) True (i) True (j) False.
A zygote is the single cell formed by fusion of gametes; a foetus is a later stage with recognisable body parts. The zygote begins division, while the foetus grows in the uterus before birth.
Asexual reproduction produces new individuals from one parent without fusion of gametes. In binary fission, Amoeba divides into two daughter cells. In budding, a bud grows on the parent, as in Hydra, and develops into a new individual.
The uterus.
Metamorphosis is the transformation of a larva into an adult through drastic changes. Examples: tadpole to frog, caterpillar to butterfly.
Internal fertilisation occurs inside the female body and usually fewer eggs are produced, as in humans and hens. External fertilisation occurs outside the body, usually in water, and many eggs are released, as in frogs and fish.
Fertilisation; internal; buds; ovary; testes; test-tube baby; oviparous; binary.