Explore topic-wise MCQs in Science.

This section includes 639 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.

451.

Due to complexities of biosphere, it is divided into smaller units called

A. Biomes
B. Biological System
C. Biosphere
D. Hydrosphere
Answer» B. Biological System
452.

Why large sharks remain in the highest trophic level in the aquatic food web?

A. Because large sharks are predators
B. Because large sharks are top predators
C. Because large sharks are phytoplankton
D. Because large sharks are zooplankton
Answer» C. Because large sharks are phytoplankton
453.

How many layers are found in atmosphere ?

A. 2
B. 3
C. 5
D. 4
Answer» E.
454.

Lakes, swamps, woods and sands are an examples of

A. Hydrosphere
B. Small Scale Ecosystem
C. Large Scale Ecosystem
D. Biomes
Answer» C. Large Scale Ecosystem
455.

What does climatic factor of abiotic constitute ?

A. Inorganic and organic substances
B. Biological System
C. Chemical Factors
D. Temperature and Heat
Answer» B. Biological System
456.

What are examples of primary succession?

A. Estuaries, Forests
B. Island, Sand or silt bed
C. Mangroves, Deserts
D. Forests, Wetland
Answer» C. Mangroves, Deserts
457.

How long folsom's flasks, algae and bacteria sustained life ?

A. 30 years
B. 40 years
C. 50 years
D. 80 years
Answer» C. 50 years
458.

What does a saprotrophs in ponds include ?

A. Frogs
B. Aquatic bacteria and flagellates
C. Fishes
D. All of above
Answer» C. Fishes
459.

Grasses, non flowering plants, shrubs and trees are examples of

A. Climax Community
B. Perennial Plants
C. Secondary Succession
D. Primary Succession
Answer» C. Secondary Succession
460.

Ecosystems are maintained by energy flows and the cycling of nutrients between

A. Living things
B. Non-Living things
C. Living and Non-living things
D. Microorganism
Answer» D. Microorganism
461.

Which ecological succession are responsible for stabilization of community?

A. Biodiversity
B. Initial causes
C. Ecesis causes
D. Stabilizing causes
Answer» E.
462.

The plants and animals living in a specific space is known as

A. Community
B. Population
C. Habitat
D. Biosphere
Answer» D. Biosphere
463.

What are the examples of crustaceans?

A. Water fleas and shrimps
B. Mulluscs
C. Zooplanktons
D. Phytoplankton's
Answer» B. Mulluscs
464.

What is ultimate source of energy in an ecosystem?

A. Sunlight
B. Nutrients
C. Food
D. Water
Answer» B. Nutrients
465.

Which of the following is the important pool of carbon?

A. Air
B. Water
C. Forest
D. Land
Answer» D. Land
466.

Green plants which manufacture their own food is known as

A. Heterotrophs
B. Autotrophs
C. Omnivores
D. Carnivores
Answer» C. Omnivores
467.

Which of the following type of forest important for watersheds?

A. Tropical Evergreen forest
B. Tropical Deciduous forest
C. Tropical Montane forests
D. Grassland forest
Answer» D. Grassland forest
468.

What's is the Abiotic elements of ecosystem

A. Living and Non-living things
B. Living things
C. Non-Living things
D. Small organisms
Answer» D. Small organisms
469.

Which food chain has a mixed group in terms of trophic levels?

A. Grazing food chain
B. Detritus food chain
C. Biological system
D. Tropical Level
Answer» C. Biological system
470.

Name the worlds wettest place?

A. Cherrapunji - India
B. Sindh-Pakistan
C. Middle East
D. Africa
Answer» B. Sindh-Pakistan
471.

There is always a loss of some energy as heat during energy flows through an ecosystem.

A. True
B. False
C. May be True or False
D. Can't say
Answer» B. False
472.

Deer, goat, grass hopper and cattles are examples of

A. Secondary Consumers
B. Primary consumers
C. Carnivores
D. Heterotrophs
Answer» C. Carnivores
473.

Water enters atmosphere by

A. Filtration
B. Evaporation
C. Evapo-transpiration
D. Biosphere
Answer» C. Evapo-transpiration
474.

What are examples of unsubsidized natural solar powered ecosystem?

A. Machines
B. Forests, Oceans and Grasslands
C. Houses
D. Industries
Answer» C. Houses
475.

A food chain combine together to form a

A. Food Chain
B. Food Web
C. Chains
D. Single Chain
Answer» C. Chains
476.

In which consumers the competition for food is great?

A. Primary Producers
B. Predators
C. Herbivores
D. Carnivores
Answer» C. Herbivores
477.

Which non-metallic minerals are used in fertilizers for agriculture?

A. Nitrate, Phosphates, Potash
B. Nitrates, Phosphorous, Copper
C. Nitrates, Copper
D. Nitrates, Lead
Answer» B. Nitrates, Phosphorous, Copper
478.

What are examples of lentic water?

A. River, Lake, Ponds
B. Streams, river and springs
C. Lake, Pond and swamps
D. Rivers and springs
Answer» D. Rivers and springs
479.

How many types of consumers are there?

A. One
B. Two
C. Three
D. Four
Answer» D. Four
480.

Air pollution, trapped by leaves, through

A. Forests
B. Grasses
C. Plant
D. Animals
Answer» B. Grasses
481.

How many zones are in open ocean ?

A. 2
B. 3
C. 4
D. 5
Answer» C. 4
482.

Why consumers cannot make their own food ?

A. Lack of favorable conditions
B. Lack of energy
C. Lack of chlorophyll
D. All of above
Answer» D. All of above
483.

How many categories of service provide of ecosystem to humans according to ‘Millennium Ecosystem Assessment (MEA)?

A. One
B. Two
C. Three
D. Four
Answer» E.
484.

Sea is salty.

A. True
B. False
C. May be True or False
D. Can't say
Answer» B. False
485.

We can find a marine ecosystem on a beach shore.

A. True
B. False
C. May be True or False
D. Can't say
Answer» B. False
486.

Which is a distinct biological community ?

A. plants
B. Biome
C. Nutrients
D. Soil
Answer» C. Nutrients
487.

Which gas is absorbed by the plants?

A. Oxygen
B. Carbandioxide
C. Natural Gas
D. Mathane gas
Answer» C. Natural Gas
488.

A carnivore which kills and eats other animals is called

A. Herbivores
B. Predators
C. Carnivore
D. Primary Producers
Answer» B. Predators
489.

Carbondioxide are combined in the cell to form

A. Enzyme
B. Sugar
C. Food
D. Nutrients
Answer» C. Food
490.

Ecosystem was first proposed by A.G Tanslay in

A. 1937
B. 1935
C. 1945
D. 1938
Answer» C. 1945
491.

Which precious metals and stones are used for jewelry and industrial cutting?

A. Diamonds
B. Gold
C. Copper
D. Lead
Answer» B. Gold
492.

More light and oxygen is available in which part of the ocean?

A. Deeper parts
B. Continental Shelf
C. Both a and b
D. None of these
Answer» C. Both a and b
493.

How much percent iron is found on the earths crust?

A. 5%
B. 2%
C. 1%
D. 3%
Answer» B. 2%
494.

Which non-metallic minerals are used in chemical industry?

A. Sulphur, salt, Potash
B. Sulphur,copper, Potash
C. Sulphur, Lead, Potash
D. Sulphur,Lead, Copper
Answer» B. Sulphur,copper, Potash
495.

How many major groups classified in decomposers?

A. One
B. Two
C. Three
D. Four
Answer» C. Three
496.

The process of making food by certain microbes create energy by some chemical reactions is known as_______________________

A. Photosynthesis
B. Food chain
C. Chemosynthesis
D. Hetrosynthesis
Answer» D. Hetrosynthesis
497.

The grass is a producer.

A. True
B. False
C. May be True or False
D. Can't say
Answer» B. False
498.

The food chain level in autotrophy is_____________

A. Primary
B. Secondary
C. Tertiary
D. Quaternary
Answer» B. Secondary
499.

The food chain from grass to hawk and again it comes back to grass with the help of fungi. In the above explain food chain, what is grass?

A. Producers
B. Consumers
C. Decomposers
D. Energy source
Answer» B. Consumers
500.

Graphical representation of trophic structure and function is known as

A. Ecological Pyramid
B. Ecosystem
C. Ecological Function
D. Environment
Answer» B. Ecosystem