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.

301.

What percent of water resources are locked in glacial and ice caps?

A. 0.03
B. 0.02
C. 0.01
D. 0.07
Answer» C. 0.01
302.

In structure of an ecosystem, composition of biological communities include:

A. Rate of production
B. Species population, biomass, distribution
C. Rate of temperature change
D. Light and temperatue
Answer» C. Rate of temperature change
303.

Humans consume plants and animals therefore they are called

A. Omnivors
B. Herbivores
C. Carnivore
D. Consumers
Answer» B. Herbivores
304.

Large carnivores which feed on primary carnivores are known as

A. Tertiary Consumers
B. Primary consumers
C. Omnivores
D. Herbivores
Answer» B. Primary consumers
305.

How many percents of energy transferred from one trophic level to the next higher level?

A. 10%
B. 20%
C. 50%
D. 100%
Answer» B. 20%
306.

Terrestrial biome vegetation effects

A. Soil Structure
B. Weather
C. Precipitation
D. Vegetation cover
Answer» B. Weather
307.

What is average temperature of taiga in winter ?

A. 4C
B. 5C
C. 6C
D. 9C
Answer» D. 9C
308.

Which consumers use carbon in their food ?

A. Eukaryotic algae
B. Detrivores
C. Saprotrophs
D. Both b and c
Answer» E.
309.

Which state in India has the maximum percentage of its area covered by forests?

A. Arunachal Pradesh
B. Madhya Pradesh
C. Mizoram
D. Nagaland
Answer» C. Mizoram
310.

'Herbivores' are known as

A. Secondary Consumers
B. Primary consumers
C. Producers
D. Decomposers
Answer» C. Producers
311.

If there is a shortage of deer in forest, what tiger might do?

A. Eat grassland leaves
B. Die due to starvation
C. Hunt for other animals
D. Fasting until they find deer
Answer» D. Fasting until they find deer
312.

What are two major components of an ecosystem?

A. Biotic and abiotic factors
B. Microorganisms
C. Temperature and humidity
D. Light and Food
Answer» B. Microorganisms
313.

'Decomposers' are also known as

A. Carnivores
B. Saprotrophs
C. Carnivores
D. Producer
Answer» C. Carnivores
314.

What produces high level of ground ozone?

A. Metals and Hydrocarbons
B. Hydrocarbons and Nitrogen Oxides
C. Both a and b
D. Nox and Sox
Answer» C. Both a and b
315.

Ppm stands for

A. Parts per million
B. Page per minute
C. Portable people meter
D. People progressive movement
Answer» B. Page per minute
316.

All the ocean life depends on the

A. Primary Producers
B. Phytoplankton
C. Both a and b
D. Marine Organism
Answer» D. Marine Organism
317.

What percent of energy is lost during each trophic level?

A. 10%
B. 30%
C. 80%
D. 90%
Answer» E.
318.

In solar ecosystem, an extra energy is available for system, used for production of:

A. Organic matters
B. Food
C. Water
D. CO₂
Answer» B. Food
319.

What are examples of consumers?

A. Green plants
B. Animals and Protozoa
C. Herbivores
D. Bacteria
Answer» C. Herbivores
320.

Why the ozone in the stratosphere is good for humans?

A. It does not allow the harmful rays of sun to reach the earth surface
B. It protects humans/Animals and plants from disease
C. Blocks the harmful radiations to reach on the surface of earth and protects human from diseases
D. Blocks the pollutant to upper parts of the atmosphere
Answer» D. Blocks the pollutant to upper parts of the atmosphere
321.

The hydrogen is added to the carbondioxide molecules to form sugar and other carbohyderates while the oxygen leave the

A. Leaf
B. Stem
C. Roots
D. Enyzms
Answer» B. Stem
322.

The total of all the individuals of the same species in an ecosystem is known as

A. Community
B. Population
C. Ecosystem
D. Biosphere
Answer» C. Ecosystem
323.

Which forest is a source of lumber and paper pulp?

A. Tropical rain forest
B. Monsoon
C. Desert
D. Boreal Forest
Answer» E.
324.

'Abiotic' community cannot live in

A. Polluted environment
B. Isolation
C. Without sunlight
D. Hydrosphere
Answer» C. Without sunlight
325.

Primary macro-consumers are herbivores, which feeds on

A. Animals
B. Minute floating Plants
C. Living Plants and plant residue
D. Decomposers
Answer» D. Decomposers
326.

Which biome is located at equatorial region?

A. Taiga forests
B. Tropical Rain Forests
C. Temperate Forest
D. Boreal Forest
Answer» C. Temperate Forest
327.

Enzymes are present in the

A. Water
B. Soil
C. Plants Cell
D. Nutrients
Answer» D. Nutrients
328.

Where can we find coniferous forest in India?

A. Deserts
B. River deltas
C. Grassland
D. Himalayan
Answer» E.
329.

Who believes that quotas and regulations are not necessary for fishing?

A. Fishermen
B. Farmers
C. Employees
D. All of these
Answer» B. Farmers
330.

Soot causes

A. Low level Smog
B. Acid Rain
C. Global Warming
D. GHGs
Answer» B. Acid Rain
331.

How many types of ecological models are there?

A. One
B. Two
C. Three
D. Four
Answer» C. Three
332.

What are examples of detrivores?

A. Estuaries and mangroves
B. Ponds
C. Rainforests
D. Deserts
Answer» B. Ponds
333.

Which kind of soil we can found on the surface of Thar desert?

A. Rocky
B. Moist
C. Fertile
D. Aeolian
Answer» E.
334.

All the organisms are

A. Dependent
B. Independent
C. Interdependent
D. None of these
Answer» D. None of these
335.

Which biome is the most productive biome?

A. Savanna
B. Tropical rain forest
C. Tundra
D. Cool temperate
Answer» C. Tundra
336.

Which of the following is correct order of food web for aquatic food web?

A. Diatoms->pteropods->lantern fish->squid->marlin
B. Diatoms->lantern fish->squid->marlin->pteropods
C. Lantern fish-> diatoms-> squid-> marlin->pteropods
D. Lantern fish-> diatoms-> squid-> pteropods-> marlin
Answer» B. Diatoms->lantern fish->squid->marlin->pteropods
337.

Which of the following ecological pyramids is the most fundamental?

A. Pyramid of energy
B. Pyramid of numbers
C. Pyramid of biomass
D. Pyramid of force
Answer» B. Pyramid of numbers
338.

Green plants are called

A. Herbivores
B. Consumers
C. Producers
D. Omnivores
Answer» D. Omnivores
339.

In tropical rain forest, annual rain exceeds

A. 140cm
B. 120cm
C. 90cm
D. 100cm
Answer» B. 120cm
340.

In which areas the carnivores live in a small groups?

A. East African Savanna's
B. Tundra
C. Tropical Forests
D. Cool Temperate
Answer» B. Tundra
341.

Carbon dioxide is causes

A. Air pollution
B. Fatigue Headaches
C. Global Warming
D. Heath problems
Answer» C. Global Warming
342.

In which process the opposite of photosnthesis occurs?

A. Infiltration
B. Respiration
C. Transpiration
D. Evaporation
Answer» C. Transpiration
343.

The extent of tropical rain forest in central and south America is greater than in

A. Africa
B. Australia
C. Asia
D. Antarctica
Answer» D. Antarctica
344.

How can desert ecosystems be conserved?

A. By minimizing the human activity
B. By pouring water to desert area
C. By deforestation
D. By killing organisms
Answer» B. By pouring water to desert area
345.

Anthropogenic pollutants have overloaded system, while natural equilibrium is

A. Unbalanced
B. Destructed
C. Balanced
D. Disturbed
Answer» E.
346.

Closed seasons for fishing is during

A. Main Breeding time
B. Not breeding time
C. After the breeding time
D. All of these
Answer» B. Not breeding time
347.

What is energy input in man subsidized solar powered ecosystem?

A. 10,000 to 50,000 kcal/m² per year
B. 3,000 to 40,000 kcal/m² per year
C. 30,000 to 40,000 kcal/m² per year
D. 10,000 to 40,000kcal/m² per year
Answer» E.
348.

Zone marking end of troposphere is known as:

A. Stratopouse
B. Tropopause
C. Menopause
D. Thermopause
Answer» C. Menopause
349.

Fishermen are allowed to caught

A. 20%
B. 25%
C. 12%
D. 15%
Answer» C. 12%
350.

Conversion of solar energy is governed by law of

A. Conversion
B. Convection
C. Thermodynamics
D. Inertia
Answer» D. Inertia