Flashcards
Class 12, Chapter 1 - Reproduction in organisms | NCERT
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
True or false?
In sexual reproduction gametes are mandatory.
True or false?
Asexual reproduction is common among single-celled organisms.
True or false?
Gametes are diploid cells.
How do we call an organism that an exact copy of its parent?
a clone
microscopic motile structures used in asexual reproduction
main stem of the plant able to create new offspring
Match columns
fragmentation
breaking body of organism into pieces that grow to adult forms
cell formed by a fertilization event between two gametes
gametes similar in appearance
True or false?
There are no bisexual animals.
True or false?
At the end of meiosis, only one set of chromosomes gets incorporated into each gamete.
True or false?
In majority of organisms, male gametes are motile and female gamete is stationary.
How do we call period of growth in animals?
vegetative phase
juvenile phase
starting phase
Cyclical changes during reproduction in non-primate mammals is called:
menstrual cycle
ovary 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 with male genes only.
Process of halting the zygote development until good environmental conditions are met.
Process of development of gamete without fertilisation.
Process of development of gamete without fertilisation.
True or false?
In fsh, amphibians and majority of algae, external fertilisation occurs.
True or false?
Usually, organisms that utilize external fertilisation, small numbers of gametes are being released.
True or false?
Majority of plants utilize internal fertilisation.
Characterize internal fertilisation process.
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?
binary fission
mitosis
cell differentiation
meiosis
mitosis
cell differentiation
How many chromosomes are in human gamete?
21
23
42
46
True or false?
Meiocytes are diploid.
True or false?
Chances of survival are greater in oviparous animals than in viviparous ones.
Which animals are oviparous?
mammals
birds
reptiles
amphibians
birds
reptiles
amphibians
What is the name os structure where zygote is formed in flowering plants?
ovule
Thick wall of a fruit is called:
encystation
pericarp
conidia
gemmules
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