Fill in the following blanks with suitable words:
(a) The process of …………. ensure continuity of life on earth.
(b) The cells involved in sexual reproduction are called ……………..
(c) Fusion of gametes gives rise to a single cell called ………..
(d) The process of fusion of gametes is called ……..
(e) The other name of egg cell is …………….
(f) A sperm is much ………………. than an egg cell.
(g) In humans, one nature egg (or ovum) is released into oviduct every ………. by one of the ovaries.
(h) The egg laying animals are called ………… animals.
(i) The cow is a ………… animal whereas ostrich is an …………………. animal.
(j) The change of caterpillar into an adult silk moth is called ……………….
(k) The larva of frog is called ………….
(l) The two common methods of asexual reproduction in animals are ………. and …………………
(m) Dolly , the sheep, was produced by the technique called ………………….
Answers
B-gamets
C- zygote
D-fertilization
E-ova
G-smallest
H-oviparous
I-viviparous, oviparous
J-cocoon
K-tadpole
L-budding, binary fission
M-cloning
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Fill in the following blanks:
(a) The process of reproduction ensure continuity of life on earth.
Reproduction is a sexual or asexual process where a offspring is produced from parents.
(b) The cells involved in sexual reproduction are called gametes.
Gametes are sex or reproductive cells which are haploid in nature.
(c) Fusion of gametes gives rise to a single cell called zygote.
Zygote is formed during fertilisation process. It is formed by fusion of sperm and egg.
(d) The process of fusion of gametes is called fertilisation.
Fertilisation is a process where sperm from male sex organ fuses with egg in a female sex organ.
(e) The other name of egg cell is ovum.
Ovum of oocytes are in female individual.
(f) A sperm is much smaller than an egg cell.
A egg is said to 100,000 times bigger than sperm. Sperm is motile whereas egg is immobile.
(g) In humans, one nature egg (or ovum) is released into oviduct every month by one of the ovaries.
When egg is released into fallopian tube, it form a thick ended uterine lining. If there is no sperm, then it drops as menstrual flow.
(h) The egg laying animals are called oviparous animals.
When embryonic development does not takes place inside a mother, then the animals are called oviparous animals.
(i) The cow is a viviparous animal whereas ostrich is an oviparous animal.
When embryonic development takes place inside the body of mother, then it is called as viviparous animal. When embryonic development takes place outside the body of mother, then it is called as oviparous animal.
(j) The change of caterpillar into an adult silk moth is called metamorphosis.
It is a biological process where the physical structure of a animal changes through certain cell development in certain period of time.
(k) The larva of frog is called tadpole.
In frog, external fertilisation takes place where fusion takes place outside the body of animals. Frog form egg which becomes tadpole which is formed into froglet and it later becomes a adult frog.
(l) The two common methods of asexual reproduction in animals are binary fission and budding.
When a organisms divides into two daughter animals, then it is called as binary fission. When a bud is grown in parents animals, and dejection of that bud is called as budding.
(m) Dolly , the sheep, was produced by the technique called somatic cell nuclear transfer.
In this laboratory strategy, a donor nucleus from one animal is fused with egg cell of another animal.