Our Environment Test

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Our Environment Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

The animal which eats both plants and other animals is called______.

A
Autotrophic

B
Herbivorous

C
Carnivorous

D
Omnivorous
Question 2
1 / -0

Biodegradable wastes should be separated and kept in .............. colour bins for garbage collectors.

A
Blue

B
Green

C
Red

D
White

Solution

Biodegradable wastes should be separated and kept in green colour bins for garbage collectors. Biodegradable waste is any waste that can be decomposed by microorganisms into simpler compounds which are beneficial for the environment. Common biodegradable wastes are food and kitchen waste, manure, sewage, agricultural and forestry waste, and certain textiles.
So, the correct answer is option B.
Question 3
1 / -0

The ozone layer in our atmosphere protects us from the bad effects of:

A
Carbon dioxide

B
CFC's

C
The sun's ultraviolet rays

D
All of the above

Solution

The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects. When the sky is clear, there is an inverse relationship between stratospheric ozone and solar UVR measured at the Earth’s surface. That is,the lower the ozone levels, the higher the solar UVR.

Hence, the correct option is $$\text{C}$$
Question 4
1 / -0

Identify the organisms that may be found at (a), (b), (c), and (d) position in the food web shown above.

A
(a)- Dog; (b)- Squirrel, (c)- Bat, (d)- Deer

B
(a)- Rat; (b)- Dog, (c)- Tortoise, (d)- Crow

C
(a)- Squirrel; (b)- Cat; (c)- Rat, (d)- Pigeon

D
(a)- Deer; (b)- Rabbit; (c)- Frog, (d)- Rat
Solution
(a) is eating vegetation, this means that it is a herbivore. It is being eaten by the lion. Hence, it could be a deer.
(b) is eating vegetation, this means it is also a herbivore. It is being eaten by foxes. Hence, it could be a rabbit.
(c) is eating a grasshopper, which means it is a carnivore. It is being eaten by snakes. Hence, it could be a frog.
(d) is eating seeds, this means it is a herbivore. It is being eaten by hawks. Hence, it could be a rat.
So, the correct answer is '(a)- deer; (b)- rabbit; (c)- frog, (d)- rat'.
Question 5
1 / -0

In the given food web, an insecticide is sprayed to kill the caterpillars. In which organisms will the highest level of insecticide accumulate after a period of time?

A
Foxes

B
Hawks

C
Mice

D
Sparrows

Solution

Highest accumulation of insecticide could be found in hawk because it is at the top of the food web. It will obviously reach all other organisms in the food web, but the maximum is found in hawk. This is scientifically termed as 'biological magnification'.
Biological magnification often refers to the process of transfer of harmful chemicals in increasing concentration in successive trophic levels.
Question 6
1 / -0

Read the following statements.
I. In a food chain, there is a multidirectional flow of energy from the sun to producers, consumers, and decomposers.
II. Shorter food chains provide more energy as compared to longer food chains.
III. In an ecosystem, no food chain is independent.
IV. The energy available at each successive trophic level increases.
Which of these statements are correct?

A
I and II

B
II and III

C
III and IV

D
I and IV
Solution
- In ecology, a food chain is a series of organisms that eat one another so that energy and nutrients flow from one to the next. It starts with the autotrophs who can prepare their own food by using sunlight and carbon dioxide from the atmosphere. They form the base of all the food chains. There is a unidirectional flow of energy from the sun to producers, consumers, and decomposers.
- All food chains are interconnected and form the food web. A food web with intersecting food chains represents the different things an organism can eat and be eaten by.
- Energy transfer at each successive trophic level decreases as there is a loss of energy at each level. Therefore, short chains provide more energy than longer chains.
Thus, the correct option is B.
Question 7
1 / -0

A decrease in the grass population will most immediately decrease the available energy for the:

A
Mouse

B
Snake

C
Hawk

D
Frog

Solution

From the above food web, we can infer that out of the options given above, a mouse is the primary consumer of grass.
If the population of grass decreases, the available energy will decrease for a mouse.
Thus, the correct answer is option A.
Question 8
1 / -0

The given figure shows four food chains with humans as a top consumers. Which two of these chains supply the maximum amount of energy to the human?

A
P and Q

B
P and S

C
Q and R

D
Q and S
Solution
- In a food chain, energy decreases at each successive trophic level. According to Lindeman's law of trophic efficiency, the efficiency of energy transfer from one trophic level to the next is about 10%.
- The food chains P and Q have three trophic levels whereas food chains Q and R have four trophic levels.
- Hence, in food chains, Q and R, the energy that will be supplied to humans will be less as compared to the energy supplied in food chains P and S because in food chains Q and R, energy will decrease at each successive trophic level.
- So, maximum energy will be supplied to humans in food chains P and S.
Thus, the correct answer is option B.
Question 9
1 / -0

Ultraviolet radiation from sunlight causes the reaction that produces:

A
$$SO_2$$

B
CO

C
Ozone

D
Fluorides

Solution

Air pollution is formed through the reaction of solar radiation with airborne pollutants like nitrogen oxides and volatile organic compounds. These compounds, which are called primary pollutants, are often introduced into the atmosphere through automobile emissions and industrial processes. Ultraviolet light can split nitrogen dioxide into nitric oxide and monatomic oxygen; this monatomic oxygen can then react with oxygen gas to form ozone.
Therefore, the correct answer is option C.
Question 10
1 / -0

In a food chain, lions occupy which trophic level?

A
First

B
Second

C
Third

D
Both B and C

Solution

In a grassland food chain, plants are the producers. Primary consumers like deer eat these plants. Secondary consumers like lions eat the primary consumers. So, a lion occupies the third level in a food chain.
Hence, the correct answer is C.