Class 12 Biology - Chapter 13: Organisms and Population MCQ Questions

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Question 1

Which of the following forest plants controls the light conditions at the ground?

A Herbs.

B Tall trees

C Shrubs

D Lianas and climbers

Question 2

Lichens are the associations of:

A fungus and virus.

B fungus and algae

C algae and bacterium

D bacteria and fungus

Question 3

What parameters are used for tiger census in our countryâ€™s national parks and sanctuaries?

A Actual head counts.

B Faecal pellets only

C Pug marks and faecal pellets

D Pugmarks only

Question 4

What would be the per cent growth or birth rate per individual per hour for the same population mentioned in the previous question?

A 150.

B 50

C 200

D 100

Question 5

According to Allenâ€™s Rule, the mammals from colder climates have:

A shorter ears and shorter limbs.

B longer ears and longer limbs

C longer ears and shorter limbs

D shorter ears and longer limbs

Question 6

Which of the following is a partial root parasite?

A Ganoderma.

B Orobanche

C Mistletoe

D Sandal wood

Question 7

Amensalism is an association between two species where :

A both the species are harmed.

B one species is benefitted and other is unaffected

C one species is harmed and other is unaffected

D one species is harmed and other is benefitted

Question 8

A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?

A 32.

B 64

C 24

D 128

Question 9

A population has more young individuals compared to the older individuals. What would be the status of the population after some years?

A It will first decline and then stabilise.

B It will increase.

C It will stabilise.

D It will decline.

Question 10

Autecology is the

A relation of a biome to its environment.

B relation of a community to its environment

C relation of an individual to its environment

D relation of a population to its environment

Question 11

What will happen to a well growing herbaceous plant in the forest if it is transplanted outside the forest in a park?

A It grows very well because the plant gets more sunlight.

B It may not survive because of change in its microclimate

C It will grow well because it is planted in the same locality

D It will grow normally

Question 12

Which one of the following organisms reproduces sexually only once in its life time?

A Eucalyptus.

B Tomato

C Mango

D Banana plant

Question 13

Biosphere is:

A Composed of all living organisms present on the earth which interact with the physical environment.

B Life in the outer space

C Composed of the plants present in the soil

D A component in the ecosystem

Question 14

If a population of 50 Paramoecium present in a pool increases to 150 after an hour, what would be the growth rate of population?

A 100 per hour.

B 5 per hour

C 200 per hour

D 50 per hour

Question 15

Which of the following would necessarily decrease the density of a population in a given habitat?

A Natality and immigration.

B Mortality and emigration

C Immigration > emigration

D Natality > mortality

Question 16

Ecological niche is:

A formed of all plants and animals living at the bottom of a lake.

B the physical position and functional role of a species within the community

C a an ecologically adapted zone

D the surface area of the ocean

Question 17

Salt concentration (salinity) of the sea measured in parts per thousand is:

A 30-35.

B 0-5

C 30-70

D 10-15

Question 18

Formation of tropical forests needs mean annual temperature and mean annual precipitation as:

A 5-15Â°C and 100-200 cm.

B 30-50Â°C and 100-150 cm

C 5-15Â°C and 50-100 cm

D 18-25Â°C and 150-400 cm

Question 19

In 2005, for each of the 14 million people present in a country, 0.028 were born and 0.008 died during the year. Using exponential equation, the number of people present in 2015 is predicted as:

A 18 millions.

B 20 millions

C 17 millions

D 25 millions

Question 20

Ecotone is:

A A zone of developing community.

B A zone of transition between two communities

C The bottom of a lake

D A polluted area

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Class 12 Biology - Chapter 13: Organisms and Population MCQ Questions

Your Class 12 Biology Study Path

Which of the following forest plants controls the light conditions at the ground?

Lichens are the associations of:

What parameters are used for tiger census in our countryâ€™s national parks and sanctuaries?

What would be the per cent growth or birth rate per individual per hour for the same population mentioned in the previous question?

According to Allenâ€™s Rule, the mammals from colder climates have:

Which of the following is a partial root parasite?

Amensalism is an association between two species where :

A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?

A population has more young individuals compared to the older individuals. What would be the status of the population after some years?

Autecology is the

What will happen to a well growing herbaceous plant in the forest if it is transplanted outside the forest in a park?

Which one of the following organisms reproduces sexually only once in its life time?

Biosphere is:

If a population of 50 Paramoecium present in a pool increases to 150 after an hour, what would be the growth rate of population?

Which of the following would necessarily decrease the density of a population in a given habitat?

Ecological niche is:

Salt concentration (salinity) of the sea measured in parts per thousand is:

Formation of tropical forests needs mean annual temperature and mean annual precipitation as:

In 2005, for each of the 14 million people present in a country, 0.028 were born and 0.008 died during the year. Using exponential equation, the number of people present in 2015 is predicted as:

Ecotone is:

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