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Life on the Earth Class 11 MCQs Questions with Answers
I. Choose the correct answer
Question 1.
Name the largest terrestrial community of plants and animals in interaction with the environment
(a) biome
(b) forest
(c) ecosystem
(d) none of these
Answer
Answer: (a) biome.
Question 2.
Name the famous animal of savanna of Australia
(a) monkey
(b) giraffe
(c) kangaroos
(d) none of these
Answer
Answer: (c) kangaroo
Question 3.
Which biome supports the greatest variety of hoofed herbivore species?
(a) savanna
(b) tropical Savanna
(c) taiga
(d) tundra
Answer
Answer: (b) tropical Savanna.
Question 4.
The other name of Mediterranean scrub forest is
(a) chapparal
(b) prairies
(c) grassland
(d) none of these
Answer
Answer: (a) chapparal.
Question 5.
Name the grassland of South Africa
(a) steppes
(b) prairies
(c) chapparal
(d) velds
Answer
Answer: (d) velds
Question 6.
Name the tropical forest in India
(a) tundra
(b) tarai
(c) steppes
(d) none of these
Answer
Answer: (b) tarai.
Question 7.
The sun-loving woody climbers on trees, espcially in tropical rain forests are known as
(a) lianas
(b) grassland
(c) velds
(d) tarai
Answer
Answer: (a) lianas.
Question 8.
The interacting system of the biotic community and the physical environment is known as
(a) ecosystem
(b) biosphere
(c) biome
(d) none of these
Answer
Answer: (a) ecosystem.
Question 9.
Name the multicellular animal consumers
(a) animalia
(b) annelida
(c) homosapiens
(d) none of these
Answer
Answer: (a) animalia.
Question 10.
The imbalance in ecosystem is caused by
(a) man
(b) natural disasters
(c) both of these
(d) none of these
Answer
Answer: (c) both of these.
Question 11.
Give the name to the negative interaction of organisms within the biotic environment:
(a) succession
(b) competition
(c) interrelation
(d) none of these
Answer
Answer: (b) competition.
Question 12.
The mutually beneficial association of two dissimilar organisms is known as
(a) mutualism
(b) food web
(c) pyramid
(d) food chain
Answer
Answer: (a) mutualism.
Question 13.
What name is given to the network of food chains?
(a) pyramid
(b) tropical levels
(c) food levels
(d) food web
Answer
Answer: (d) food web.
Question 14.
Name the second order consumers like tiger which depend on flesh for food
(a) herbivores
(b) carnivores
(c) producers
(d) none of these
Answer
Answer: (b) carnivores.
Question 15.
The green plants which produce carbohydrates by photosynthesis are known as
(a) producers
(b) herbivores
(c) both of them
(d) none of them
Answer
Answer: (a) producers.
Question 16.
Each step in the food chain of organisms is known as
(a) trophic level
(b) pyramid
(c) food chain
(d) none of these
Answer
Answer: (a) trophic level.
Question 17.
Name the multicellular decomposers
(a) algae
(b) fungi
(c) mosses
(d) none of these
Answer
Answer: (b) fungi.
Question 18.
The shallow zone of life at the earth’s surface is known as
(a) atmosphere
(b) biosphere
(c) hydrosphere
(d) none of these
Answer
Answer: (b) biosphere.
Question 19.
Which one is the geochemical element of the biosphere?
(a) nitrogen
(b) oxygen
(c) carbon
(d) all of these
Answer
Answer: (d) all of these.
Question 20.
Which element is the essential constituent of amino acids, nucleic acids, proteins, etc.?
(a) oxygen
(b) carbon
(c) nitrogen
(d) none of these
Answer
Answer: (c) nitrogen.
Question 21.
By which process the bacteria converts nitrates into free nitrogen
(a) nitrification
(b) photosynthesis
(c) nitration
(d) denitrification
Answer
Answer: (d) denitrification.
Question 22.
All living organisms maintain circulation of water in solid, liquid or gaseous state, referred to as
(a) hydrologic cycle
(b) carbon cycle
(c) oxygen cycle
(d) water cycle
Answer
Answer: (a) hydrologic cycle.
Question 23.
How many types of biogeochemical cycles are there?
(a) three
(b) two
(c) four
(d) none of these
Answer
Answer: (b) two.
Question 24.
Name the main by-product of photosynthesis
(a) carbon
(b) hydrogen
(c) oxygen
(d) water
Answer
Answer: (c) oxygen.
Question 25.
Oxygen combines with nitrogen to form
(a) nitrates
(b) nitrogen oxide
(c) both of them
(d) none of these
Answer
Answer: (c) both of them.
II. Fill up the blanks with suitable words
Question 1.
The …………….. is made up of ……………. and ……………. elements.
Answer
Answer: environment, abiotic, biotic
Question 2.
Ecosystems are of two types, …………….. and ……………
Answer
Answer: terrestrial, aquatic
Question 3.
Ecology is the study of earth as a …………….. of plants, animals and …………….
Answer
Answer: household, micro-organisms
Question 4.
…………….. can be classified as marine and freshwater.
Answer
Answer: Aquatic ecosystem
Question 5.
Biotic factors include the producers, ……………., …………….., ………………. and the ……………..
Answer
Answer: primary consumers, secondary consumers, tertiary consumers, decomposers
Question 6.
Transfer of energy that occurs during the process of a food chain from one level to another is known as …………….
Answer
Answer: flow of energy
Question 7.
This inter-connecting network of species is known as ……………
Answer
Answer: food web
Question 8.
…………… occur in eastern North America, north eastern Asia and in western and central Europe.
Answer
Answer: Temperate forests
Question 9.
Temperate grasslands are called ………………
Answer
Answer: Steppes
Question 10.
……………. of ocean water provides precipitation.
Answer
Answer: Evaporation
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