This practice test includes 25 important multiple choice questions from the chapter - Organisms And Populations (Class 12th Biology).
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Q.1.
For human population, the age pyramids generally show age distribution of
- Only males
- Only females
- Of males and females
- None of the above
Answer:
(c) Of males and females
Explanation: the age pyramids generally show age distribution of Of males and females
Explanation: the age pyramids generally show age distribution of Of males and females
Q.2.
The size of the population tells us a lot about its status in the
- Environment
- Sex-ratio
- Age pyramid
- Habitat
Answer:
(d) Habitat
Explanation: The size of the population tells us a lot about its status in the Habitat
Explanation: The size of the population tells us a lot about its status in the Habitat
Q.3.
The number of deaths in the population during a given period is referred to
- Natality
- Mortality
- Sex-ratio
- None of the above
Answer:
(b) Mortality
Explanation: The number of deaths in the population during a given period is referred to Mortality
Explanation: The number of deaths in the population during a given period is referred to Mortality
Q.4.
The number of birth during a given period in the population that are added to the initial density is referred to
- Natality
- Mortality
- Sex-ratio
- None of the above
Answer:
(a) Natality
Explanation: It is referred as Natality
Explanation: It is referred as Natality
Q.5.
Parasites that live inside the host body at different sities are called
- Ecto parasites
- Endo parasites
- Brood parasitism
- None of the above
Answer:
(b) Endo parasites
Explanation: Parasites that live inside the host body at different sities are called Endo parasites
Explanation: Parasites that live inside the host body at different sities are called Endo parasites
Q.6.
Parasites that feed on the external surface of the host organism are called
- Ecto parasites
- Endo parasites
- Brood parasitism
- None of the above
Answer:
(a) Ecto parasites
Explanation: Parasites that feed on the external surface of the host organism are called Ecto parasites
Explanation: Parasites that feed on the external surface of the host organism are called Ecto parasites
Q.7.
If one species is harmed whereas the other is unaffected is called
- Commensalism
- Amensalism
- Mutualism
- None of the above
Answer:
(a) Commensalism
Explanation: It is called as Commensalism.
Explanation: It is called as Commensalism.
Q.8.
The interaction where one species is benefitted and the other is neither benefitted nor harmed is called
- Commensalism
- Amensalism
- Mutualism
- None of the above
Answer:
(a) Commensalism
Explanation: It is called as Commensalism.
Explanation: It is called as Commensalism.
Q.9.
One species benefit in
- Parasitism
- Predation
- Mutualism
- Both (a) and (b)
Answer:
(d) Both (a) and (b)
Explanation: Both (a) and (b)
Explanation: Both (a) and (b)
Q.10.
Both species lose in
- Mutualism
- Competition
- Parasitism
- Predation
Answer:
(b) Competition
Explanation: Both species lose in Competition
Explanation: Both species lose in Competition
Q.11.
Both the species benefit in
- Parasitism
- Mutualism
- Competition
- Predation
Answer:
(b) Mutualism
Explanation: Both the species benefit in Mutualism
Explanation: Both the species benefit in Mutualism
Q.12.
A stage of suspended development is called
- Diapause
- Suspend
- Migrate
- Aestivation
Answer:
(a) Diapause
Explanation: A stage of suspended development is called Diapause
Explanation: A stage of suspended development is called Diapause
Q.13.
To avoid summer-related problems – heat and desiccation by organism is called
- Hibernation
- Suspend
- Migrate
- Aestivation
Answer:
(d) Aestivation
Explanation: To avoid summer-related problems – heat and desiccation by organism is called Aestivation
Explanation: To avoid summer-related problems – heat and desiccation by organism is called Aestivation
Q.14.
Winter sleep is also called as
- Hibernation
- Suspend
- Migrate
- Aestivation
Answer:
(a) Hibernation
Explanation: Winter sleep is also called as Hibernation
Explanation: Winter sleep is also called as Hibernation
Q.15.
The shifting of an organism temporarily from the stressful habitat to a more hospitable area and return when stressful period is over is called
- Suspend
- Migrate
- Hibernation
- Aestivation
Answer:
(b) Migrate
Q.16.
Habitat together with functions of a species constitute its:
- Topography
- Trophic level
- Boundary
- Ecological niche
Answer:
(d) Ecological niche
Explanation: Habitat together with functions of a species constitute its Ecological niche
Explanation: Habitat together with functions of a species constitute its Ecological niche
Q.17.
The maximum growth rate occurs in
- Lag phase
- Exponential, phase
- Stationary phase
- Senescent phase
Answer:
(b) Exponential, phase
Explanation: Exponential, phase
Explanation: Exponential, phase
Q.18.
In which one of the following habitats, does the diurnal temperature of soil surface view most?
- Shrub land
- Forest
- Desert
- Grassland
Answer:
(c) Desert
Explanation: In desert the diurnal temperature of soil surface view most.
Explanation: In desert the diurnal temperature of soil surface view most.
Q.19.
Science linking heredity with environment is:
- Ecology
- Ecophysiology
- Genecology
- Genetics
Answer:
(c) Genecology
Explanation: Science linking heredity with environment is Genecology
Explanation: Science linking heredity with environment is Genecology
Q.20.
Submerged hydrophytes have disseced leaves for
- Decreasing surface area
- Increasing surface area
- Reducing effect pf water currents
- Increasing number of stomata
Answer:
(c) Reducing effect pf water currents
Explanation: For Reducing effect pf water currents
Explanation: For Reducing effect pf water currents
Q.21.
Water holding capacity is maximum in
- Clay
- Sand
- Slit
- Gravel
Answer:
(a) Clay
Explanation: Water holding capacity is maximum in Clay
Explanation: Water holding capacity is maximum in Clay
Q.22.
Animals undergo inactive stage during winters. It is called
- Acclimatisation
- Hibernation
- Aestivation
- Adapatation
Answer:
(b) Hibernation
Q.23.
Praying mantis is a good example of
- Camouflage
- Mullarian mimicry
- Warning colouration
- Social insect
Answer:
(a) Camouflage
Explanation: Praying mantis is a good example of Camouflage
Explanation: Praying mantis is a good example of Camouflage
Q.24.
Animals have innate ability to escape from predation. Select the incorrect example:
- Colour change in Chameleon
- Enlargement of body by swallowing air in puffer fish
- Poison fangas of snakes
- Melaninin in moths
Answer:
(c) Poison fangas of snakes
Explanation: Poison fangas of snakes is incorrect
Explanation: Poison fangas of snakes is incorrect
Q.25.
Ozone protects biosphere from high energetic:
- Infra-red rays
- Ultraviolet rays
- X-rays
- gamma rays
Answer:
(b) Ultraviolet rays
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