Our Environment Test

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Our Environment Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

The organisms that depend upon the food produced by autotrophs are called

A
Herbivores

B
Carnivores

C
Saprophytes

D
Heterotrophs

Solution

All living organisms that prepare their own food with the help of sunlight, in the presence of chlorophyll by the process of photosynthesis are called autotrophs. The living organisms that feed on autotrophic organisms are called heterotrophs.
Heterotrophs may be:
1. Herbivores - feeding on food prepared by autotrophs, they are plant eaters.
2. Carnivores - feeding on autotrophs, they eat animals.
3. Omnivores - feeding on both, plants and animals.
So, option A "Herbivores" is the correct answer.
Question 2
1 / -0

In the figure given above, the producer is:

A
Grass

B
Grasshopper

C
Frog

D
Snake
Solution
- The food chain is the feeding habits or the nutrition relationship of different organisms in an ecosystem i.e., who eats whom.
- The food chain starts with autotrophs as they can prepare food on their own.
- The diagram represents a food chain where grass (green plant) is the producer, the second position is occupied by grasshopper (heterotroph) which feeds on grass which in turn is eaten by frog (secondary consumers/ primary carnivore).
- The last position (tertiary position) is occupied by top-level heterotroph or secondary carnivores.
- Thus, the grass represents the producers.
- Hence, the correct answer is option A.
Question 3
1 / -0

In an ecosystem, the population of

A
Secondary consumers is large

B
Primary consumers is large

C
Producers is larger than the consumers

D
Decomposers is large
Question 4
1 / -0

Which of the following should come in the empty box in the food chain given below?

A

B

C

D
Solution
- A food chain always begins from an autotroph (producer).
- As the green plants have the ability to fix atmospheric carbon dioxide in the presence of sunlight and convert it into usable form i.e., carbohydrates through the process of photosynthesis.
- They have the ability to pass this fixed energy to other organisms. The feeding habit or the nutrition relationship of different organisms in an ecosystem in the form of a chain i.e., who eats whom.
- The flow of energy in the form of food between different organisms is known as the food chain.
Thus, the correct answer is option B.
Question 5
1 / -0

Select the correct food chain.

A
Phytoplankton $$\rightarrow$$ Fishes $$\rightarrow$$ Zooplankton

B
Zooplankton $$\rightarrow$$ Phytoplankton $$\rightarrow$$ Fishes

C
Phytoplankton $$\rightarrow$$ Zooplankton $$\rightarrow$$ Fishes

D
Fishes $$\rightarrow$$ Zooplankton $$\rightarrow$$ Phytoplankton
Solution
The food chain is the sequence of organisms through which food and its contained energy pass in an ecosystem with members at one step becoming the food of the later step of the sequence.
Phytoplankton is the primary producer that traps solar energy for food production during photosynthesis, which is then used by the small free-floating aquatic animals called zooplankton.
Fishes are the secondary consumers that derive energy from the organism of the second trophic level.
So, the correct answer is option C.
Question 6
1 / -0

Which of the following set represents primary consumers?

A
Deers, giraffes, cows

B
Goats, rabbits, horses

C
Insects, snails

D
All of the above

Solution

Deers, giraffes, cows, goats, rabbits, horses, insects and snails, all consume the producers and hence are primary consumers.
Therefore, the correct answer is 'All of the above'.
Question 7
1 / -0

Choose the correct sequence with respect to food chain.

A
Producer $$\rightarrow$$ Consumer $$\rightarrow$$ Decomposer

B
Decomposer $$\rightarrow$$ Consumer $$\rightarrow$$ Producer

C
Producer $$\rightarrow$$ Decomposer $$\rightarrow$$ Consumer

D
Consumer $$\rightarrow$$ Producer $$\rightarrow$$ Decomposer

Solution

A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another.
Producers prepare food for themselves through the process of photosynthesis. Consumers eat producers. Consumers are themselves eaten by other higher consumers. Finally, when consumers die, the decomposers decompose their bodies to convert them into organic matter. The nutrients from the organic matter are taken up by producers.
So, the correct answer is option A.
Question 8
1 / -0

Consumers can be classified variously as ................, carnivores, ................... and ................ .

A
herbivores, omnivores, parasites.

B
plants, animals, mammals

C
plants, algae, bacteria

D
plants, fungi, cyanobacteria
Question 9
1 / -0

Which of the following are secondary consumers?

A
Frogs and dogs

B
Cats and foxes

C
Wolves and snakes

D
All the above

Solution

We know that autotrophs like green plants that prepare their own food are producers. Primary consumers are animals that eat producers. Secondary consumers feed on primary consumers.
Frogs, dogs, cats, foxes, wolves and snakes all feed on primary consumers. For example, frogs eat insects, dogs eat rabbits, cats eat fish, snakes eat other small animals like mice.
Thus, option 'D' is the correct answer.
Question 10
1 / -0

Materials that cannot be broken down by decomposers are ________.

A
Biodegradable

B
Non-biodegradable

C
Non-living things

D
All of the above

Solution

Non-biodegradable substances are those substances that cannot be broken down by biological means (decomposers). They persist in the environment for a long time, as they are not degraded by decomposers.
So, the correct option is B.