Environmental Chemistry Test

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Environmental Chemistry Test - 60

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Question 1
1 / -0

Photochemical smog affects plants by

A
Bleaching of leaves and excess production of pigments

B
Shedding of foliage and increase of transpiration

C
Decolourising and curling of leaves

D
Degradation of chlorophyll by ozone

Solution

Ozone is formed by resultant secondary pollutants in smog and degrades the photosynthetic pigments of leaves.
Ozone causes necrotic (dead) patterns on the upper surfaces of the leaves of trees. Ozone also can interfere with the growth and productivity of trees.
Thus, the correct answer is option D.
Question 2
1 / -0

Most insecticides attack upon insects on their

A
Digestive system

B
Reproductive system

C
Nervous system

D
Respiratory system

Solution

An insecticide is a substance used to kill insects. They include ovicides and larvicides used against insect eggs and larvae, respectively. Insecticides are used in agriculture, medicine, industry and by consumers. Insecticides are claimed to be a major factor behind the increase in agricultural 20th century's productivity. The mode of action describes how the pesticide kills or inactivates a pest. It provides another way of classifying insecticides. Mode of action is important in understanding whether an insecticide will be toxic to unrelated species, such as fish, birds and mammals. Most of insecticides acts upon nervous system of insects. Thus, option C is correct.
Question 3
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Which are the primary constituents of photochemical smog?

A
Hydrocarbons and CFCs

B
Carbon dioxide and NO$$_2$$

C
NO$$_2$$, O$$_3$$ and hydrocarbons

D
SO$$_2$$ and CO

Solution

Photochemical smog forms when primary pollutants like nitrogen oxides and volatile organic compound react with ultraviolet light to create a variety of toxic and reactive compounds. Ultraviolet light can split nitrogen dioxide into nitric oxide and monatomic oxygen, this monatomic oxygen can then react with oxygen gas to form ozone, aldehydes, and peroxyacetyl nitrates which are the secondary pollutants. The mixture of these primary and secondary pollutants forms photochemical smog. Thus, the correct answer is option C.
Question 4
1 / -0

Recent reports of acid rains in industrial cities are due to the effect of atmospheric pollution by

A
Excessive release of NO$$_2$$ and SO$$_2$$ by burning of fossil fuels

B
Excessive release of CO$$_2$$ by burning of fuel like wood and characol, cutting of forests and increased animal population

C
Excessive release of NH$$_3$$ by industrial plants and coal gas

D
Excessive release of CO in atmosphere by incomplete combustion of coke, characoal and other carbonaceous fuels in scarcity of oxygen

Solution

Emission of nitrogen oxides and sulphur dioxide from power stations, factories and cars causes acid rain, when they react with the tiny droplets of water in clouds to form sulphuric and nitric acids. The rain from these clouds then falls as acid, known as acid rain.
So, the correct answer is option A.
Question 5
1 / -0

Carbamates are used as a

A
Insecticide

B
Herbicides

C
Fungicides

D
All of the above

Solution

The carbamates are used in agriculture as insecticides, fungicides, herbicides, nematocides, or sprout inhibitors. In addition, they are used as biocides for industrial or other applications and in household products. A potential use is in public health vector control. Thus, these chemicals are part of the large group of synthetic pesticides that have been developed, produced, and used on a large scale in the last 40 years. Thus, option D is correct.
Question 6
1 / -0

Acid rain is due to increase in atmospheric concentration of

A
Ozone and dust

B
CO$$_2$$ and CO

C
SO$$_3$$ and CO

D
SO$$_2$$ and NO$$_2$$

Solution

NOx and $$SO_2$$ are emitted by fossil fuel combustion especially coal. These chemicals are converted into sulfuric acid and nitric acid in the atmosphere when they react with water vapour. When these acids are mixed with rain water they from acid rain. Thus, the correct answer is option D.
Question 7
1 / -0

Natural insecticide obtained from

A
Azadiracta indica

B
Derris elliptica

C
Chrysanthemum cinerari folium

D
All of the above

Solution

Azadiracta indica contains anadirectin extraction that acts as insecticide. Derris elliptica extracts containing rotenone have been long used as natural insecticide. Extraction of Chrysanthemum cinerari folium contains pyrethrin which acts as insecticide. Thus, option D is correct.
Question 8
1 / -0

Which of the following is a microbial pesticide?

A
Rotenone

B
Thurioside

C
Baygon

D
Temik

Solution

Thurioside is a toxin produced by bacterium Bacillus thuringenesis. It is used as bio insecticide as it is highly effective against disease causing insects like flies, moths, mosquitoes etc. Thus, option B is correct.
Question 9
1 / -0

Which of the following is found in photochemical smog?

A
CO

B
$$NO_2 $$

C
Ozone

D
Both B and C
Question 10
1 / -0

Phytotron is

A
A controlled condition chamber for plants

B
Leaf culture process

C
Special culture of seeds

D
Root culture process

Solution

A phytotron is an enclosed research greenhouse used for studying interactions between plants and the environment. It was a product of the disciplines of plant physiology and botany.
Phytotron provides natural environment to plants but does away with factors, which can influence the results of scientific experiments on plants. That means it is controlled, conditioned chamber for plants.

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Re-Attempt Weekly Quiz Competition

Environmental Chemistry Test - 60

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Environmental Chemistry Test - 60

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SHARING IS CARING

Question 1

Bleaching of leaves and excess production of pigments

Shedding of foliage and increase of transpiration

Decolourising and curling of leaves

Degradation of chlorophyll by ozone

Solution

Question 2

Digestive system

Reproductive system

Nervous system

Respiratory system

Solution

Question 3

Hydrocarbons and CFCs

Carbon dioxide and NO$$_2$$

NO$$_2$$, O$$_3$$ and hydrocarbons

SO$$_2$$ and CO

Solution

Question 4

Excessive release of NO$$_2$$ and SO$$_2$$ by burning of fossil fuels

Excessive release of CO$$_2$$ by burning of fuel like wood and characol, cutting of forests and increased animal population

Excessive release of NH$$_3$$ by industrial plants and coal gas

Excessive release of CO in atmosphere by incomplete combustion of coke, characoal and other carbonaceous fuels in scarcity of oxygen

Solution

Question 5

Insecticide

Herbicides

Fungicides

All of the above

Solution

Question 6

Ozone and dust

CO$$_2$$ and CO

SO$$_3$$ and CO

SO$$_2$$ and NO$$_2$$

Solution

Question 7

Azadiracta indica

Derris elliptica

Chrysanthemum cinerari folium

All of the above

Solution

Question 8

Rotenone

Thurioside

Baygon

Temik

Solution

Question 9

CO

$$NO_2 $$

Ozone

Both B and C

Question 10

A controlled condition chamber for plants

Leaf culture process

Special culture of seeds

Root culture process

Solution

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