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CLASS 8 (BIOLOGY)
LS 9 -REPRODUCTIONS IN ANIMALS
Q1
...
The process by which living organisms produce individuals of their own
kind
...
Reproduction is an essential process to carry on with generations and to
see people around us
...
ASEXUAL
1
...
2
...
3
...
Generally takes place in
lower organisms
5
...
Mode of reproduction
in which two individuals
are involved
...
Gamete formation takes
place
...
fertilization takes place
4
...
5
...
Testes in males and ovary in females are gonads
...
Sperms in males and ovum in females
are gametes
...
Product of fertilization is Zygote
...
(v) Offspring- the new born is called as offspring
...
(vii)Metamorphosis-The transformation of the larva into an
Adult through drastic changes is called metamorphosis
...
Butterfly, frog, silkmoth etc
...
(ix)Foetus-The stage of embryo in which all the body parts can
be identified is called a foetus
...
(nine months in human
female)
(xi) Ovulation-the release of ova by the ovary is called ovulation
(xii)Oviparous-the animals which lay eggs are called oviparous
...
hen, frog, lizard etc
...
Eg
...
(xiv) Implantation-Fixing of the embryo in the walls of the
Uterus
...
(xvi) Uterus- Muscular bag like structure where the embryo
develops till birth
...
(Usually 21 days or 3 weeks)
Q5 Differentiate between two types of gametes in humans?
Ans
SPERM
OVUM
1
...
It is the female gamete
...
Small in size
...
Big in size
...
Motile
3
...
No reserved food
...
Has reserved food
...
It has a tail
...
No tail
...
Produced by Testes
6
...
Produced millions at
7
...
a time
...
Examples-humans, hen, dog, lion, cow etc
...
Example- Frog, fish etc
...
It has a single cell
...
It has many cells
...
Formed as a result of
2
...
3
...
body organs can be identified
...
(c) IVF= In vitro fertilization
(d) DNA=Deoxy ribonucleic acid
(e) RNA= Ribonucleic acid
(f) Unicellular organism showing budding= Yeast
...
Ans IN BOOK
...
Ans