Questions and Answers
Class 12, Chapter 1 - Reproduction in organisms | NCERT
1.
What is characteristic for asexual reproduction?
there is only single parent
2.
How do we call a period from birth to natural death of an organism?
life span
Which statements are true?
3.
In sexual reproduction gametes are mandatory.
True
4.
Asexual reproduction is common among single-celled organisms.
True
5.
Gametes are diploid cells.
False
6.
How do we call an organism that an exact copy of its parent?
a clone
7.
zoospore
microscopic motile structures used in asexual reproduction
8.
rhizome
main stem of the plant able to create new offspring
9.
fragmentation
breaking body of organism into pieces that grow to adult forms
10.
zygote
cell formed by a fertilization event between two gametes
11.
homogametes
gametes similar in appearance
Which statements are true?
12.
There are no bisexual animals.
False
13.
At the end of meiosis, only one set of chromosomes gets incorporated into each gamete.
True
14.
In majority of organisms, male gametes are motile and female gamete is stationary.
True
15.
How do we call period of growth in animals?
juvenile phase
16.
Cyclical changes during reproduction in non-primate mammals is called:
oestrus cycle
17.
What is syngamy?
fusion of gametes
18.
What is parthenogenesis?
Process of development of gamete without fertilisation.
Which statements are true?
19.
In fsh, amphibians and majority of algae, external fertilisation occurs.
True
20.
Usually, organisms that utilize external fertilisation, small numbers of gametes are being released.
False
21.
Majority of plants utilize internal fertilisation.
True
22.
Characterize internal fertilisation process.
Those organisms release male gametes are motile and are released in big numbers. Female gamete is considerably less numerous.
23.
Which processes are involved in embryogenesis?
mitosis, cell differentiation
24.
How many chromosomes are in human gamete?
23
Which statements are true?
25.
Meiocytes are diploid.
True
26.
Chances of survival are greater in oviparous animals than in viviparous ones.
False
27.
Which animals are oviparous?
birds, reptiles, amphibians
28.
What is the name os structure where zygote is formed in flowering plants?
ovule
29.
Thick wall of a fruit is called:
pericarp