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Class 12, Chapter 1 - Reproduction in organisms | NCERT
Flashcards for quick repetition. Asexual and sexual reproduction in organisms. Biology class 12 chapter 1 exercise mcq test and solutions.
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What is characteristic for asexual reproduction?
there is no gamete formation
there is only single parent
there is more than two parents
there are two parents of the same sex
there is only single parent
How do we call a period from birth to natural death of an organism?
life span
Which statements are true?
1. In sexual reproduction gametes are mandatory.
2. Asexual reproduction is common among single-celled organisms.
3. Gametes are diploid cells.
1. In sexual reproduction gametes are mandatory.
2. Asexual reproduction is common among single-celled organisms.
How do we call an organism that an exact copy of its parent?
a clone
Match columns
zoospore
microscopic motile structures used in asexual reproduction
rhizome
main stem of the plant able to create new offspring
fragmentation
breaking body of organism into pieces that grow to adult forms
zygote
cell formed by a fertilization event between two gametes
homogametes
gametes similar in appearance
Which statements are true?
1. There are no bisexual animals.
2. At the end of meiosis, only one set of chromosomes gets incorporated into each gamete.
3. In majority of organisms, male gametes are motile and female gamete is stationary.
1. At the end of meiosis, only one set of chromosomes gets incorporated into each gamete.
2. In majority of organisms, male gametes are motile and female gamete is stationary.
How do we call period of growth in animals?
starting phase
juvenile phase
vegetative phase
Cyclical changes during reproduction in non-primate mammals is called:
ovary cycle
menstrual cycle
oestrus cycle
What is syngamy?
fusion of gametes
production of gametes
forming new organism from unfertilised gamete
What is parthenogenesis?
Process of development of gamete without fertilisation.
Process of halting the zygote development until good environmental conditions are met.
Process of development of gamete with male genes only.
Process of development of gamete without fertilisation.
Which statements are true?
1. In fsh, amphibians and majority of algae, external fertilisation occurs.
2. Usually, organisms that utilize external fertilisation, small numbers of gametes are being released.
3. Majority of plants utilize internal fertilisation.
1. In fsh, amphibians and majority of algae, external fertilisation occurs.
2. Majority of plants utilize internal fertilisation.
Characterize internal fertilisation process.
Those organisms release male gametes are
. . . . . . . .
and are released in
. . . . . . . .
numbers. Female gamete is considerably
. . . . . . . .
numerous.
Those organisms release male gametes are motile and are released in big numbers. Female gamete is considerably less numerous.
Which processes are involved in embryogenesis?
mitosis
binary fission
cell differentiation
meiosis
mitosis
cell differentiation
How many chromosomes are in human gamete?
Which statements are true?
1. Meiocytes are diploid.
2. Chances of survival are greater in oviparous animals than in viviparous ones.
1. Meiocytes are diploid.
Which animals are oviparous?
amphibians
birds
mammals
reptiles
What is the name os structure where zygote is formed in flowering plants?
ovule
Thick wall of a fruit is called:
gemmules
encystation
pericarp
conidia
