Zoology XII+ - Reproduction in Organism 01

Question : 1

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Period from birth to natural death of an organism can be best defined by term

Options:

	Life expectancy
	Life span
	Maximum life span
	Limited life span

Solution :

Maximum life span is the maximum number of years survived by any member of a species and life expectancy is maximum no. of individuals that reach upto particular age in a population.

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Question : 2

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Find the incorrect statement

Options:

	Life span can be correlated with size of organism and its metabolic rate
	Death of every individual organisms is inevitable except single celled organisms
	Reproduction ensure continuity of the different species
	Asexual reproduction involve only mitotic division

Solution :

Life span cannot be correlated with the size of organism.

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Question : 3

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Maximum life span is the characteristic of     A      and life expectancy is the characteristic of     B     

Options:

	A – Species, B – Population
	A – Population, B – Organism
	A – Organism, B – Species
	A – Species, B – Individual

Solution :

Maximum life span is a characteristic of species and life expectancy is a characteristic of population.

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Question : 4

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Match the following animals with their life span

Options:

	a(iv), b(i), c(iii), d(ii)
	a(i), b(iv), c(ii), d(iii)
	a(iv), b(i), c(ii), d(iii)
	a(iii), b(ii), c(i), d(iv)

Solution :

Life span of butterfly 1–2 weeks. Cow 20–25 years. Fruit fly is 30 days and elephant 60–90 years

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Question : 5

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Which category of reproduction produce genetically similar individuals?

Options:

	Somatogenic
	Agamogeny
	Sexual reproduction
	Both (1) & (2)

Solution :

Both (1) and (2) are other names of asexual reproduction.

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Question : 6

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Options:

	Binary fission Conidia Gemmule
	Fragmentation Budding Zoospore
	Multiple fission Fragmentation Conidia
	Binary fission Budding Gemmule

Solution :

A – Binary fission in Amoeba
B – External bud in Hydra
C – Gemmule/internal bud in sponges

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Question : 7

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Which of the following character is not true for asexual mode of reproduction?

Options:

	Single parent is capable of producing offspring
	Offsprings are morphologically and genetically same
	It is common mode of reproduction among single celled organisms and in plants and animals with simple organizations
	They always show formation and fusion of gametes

Solution :

Asexually reproducing organisms may or may not show gamete formation but they never show fusion of gametes.

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Question : 8

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Binary fission results in the formation of an independent daughter individuals, which resemble each other. Mark the organism in which binary fission results in formation of two dissimilar daughters

Options:

	Amoeba
	Euglena
	Ceratium
	Paramoecium

Solution :

Paramoecium produces 2 daughter – one proter (anterior) and the other opisthe (posterior)

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Question : 9

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Following are the some of the events involved in the multiple fission of Amoeba. Which of these events is incorrectly mentioned?

Options:

	Its nucleus divides several times by amitosis without involving cytokinesis
	Amoeba withdraw its pseudopodia in response to unfavourable conditions and develop three layered hard cyst around itself
	During unfavourable condition encysted Amoeba divide by multiple fission and produce many amoebulae
	Cyst will burst out in favourable season and minute amoebae comes out

Solution :

Encysted Amoeba divide during favourable season.

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Question : 10

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What could not be considered as disadvantage of asexual reproduction?

Options:

	Rapid multiplication can lead to overcrowding
	It is a simple mode of reproduction and need less resources
	Play no role in evolution
	Adaptability to change in environment is low due to absence of variations

Solution :

Asexual reproduction is uniparental so energy is not wasted in search of partner. It is simple and fast mode of reproduction