ENVIRONMENT FOR UPSC PRELIMS 2020 , TEST-30

Q 1 . Which among the following can effectively be examples of Secondary Succession?
1. Formation of a new Island after volcanic eruption
2. The renewal of a forest after a fire
3. A flooded land
4. The renewal of a crop after harvesting
Select the correct option
a) 1, 2 and 3
b) 2, 3 and 4
c) 1, 3 and 4
d) All

Q 2 . Consider the statements regarding Coral bleaching
1. It is the loss of zooxanthellae through either expulsion or loss of algal pigmentation.
2. It happens due to increase in ocean temperature only
3. All the corals undergoing bleaching are dead corals
Select the correct code
a) 1 and 3
b) Only 2
c) Only 1
d) 2 and 3

Q 3 . Which of the following is a true statement about the flow of energy in an ecosystem?
a) Smaller organisms need less energy per gram of body weight than do larger organisms.
b) Energy transfer between organisms normally involves conservation of heat energy.
c) Energy flow between trophic levels is inefficient.
d) Chemical energy is converted into radiant energy, which is then converted into chemical energy at the next trophic level.

Q 4 . Consider the following statements
1. A Swamp is a Wetland that is forested
2. Myristica swamps are tropical fresh water swamp forests found in Kerala and Karnataka
3. Swamps serve vital roles in flood protection and nutrient removal
Select the correct code
a) 1 and 2
b) 2 and 3
c) 1 and 3
d) 1, 2 and 3

Q 5 . Which of the following statements are correct about a ‘Community’ in terms of levels of organization in ecology?
1. A community is the name given to a group of organisms of a single species.
2. Communities in most instances are named after dominant plant species.
Which of the above statements are correct?
a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2

Q 6 . Nitrogen gas forms 78% of the earth’s environment. Which of the following statements are correct about atmospheric Nitrogen?
1. It creates an inert environment in atmosphere. If Nitrogen is not present, Oxygen would react violently and oxidize(burn) carbon and other elements.
2. Nitrogen adds mass to air and helps in maintaining atmospheric pressure.
3. Nitrogen is taken up by humans through respiration from the atmosphere which helps in building of amino acids and proteins.
4. Some plants have the ability to fix atmospheric nitrogen with the help of bacteria.
Select the code from below:
a) 1,2 and 3
b) 2,3 and 4
c) 1,2 and 4
d) All of the above

Q 7 . Which of the following statements are correct about the ‘Niche’ of the species?
1. A niche is a unique functional role or place of a specie in an ecosystem.
2. It is a description of all the biological, physical and chemical factors that specie needs to survive, reproduce and stay healthy.
3. Two or more species can have exact identical niches.
Select the code from below:
a) 1 and 2
b) 2 and 3
c) 1 and 3
d) All of the above

Q 8 . Which of the following statements are incorrect about ecotones?
1. It is a transition zone between two ecosystems with characteristics of adjacent ecosystems.
2. Well-developed ecotones can have entirely different species from that of adjoining communities.
3. Sometimes the number of species and the population density of some of the species is much less in this zone than either community. This is called the edge effect.
Select the code from following:
a) 1 and 2
b) 3 only
c) 2 and 3
d) None of the above

Q 9 . Consider the following statements:
1. Aquatic ecosystems are not called Biomes.
2. Lotic water systems are fresh water ecosystems with stagnant water like pools, ponds, lakes etc.
3. Lentic water bodies are fresh water ecosystems with moving water like streams, rivers, waterfalls etc.
Which of the above statements are incorrect?
a) 1 and 2
b) 2 and 3
c) 1 only
d) None of the above

Q 10 . Consider the following statements regarding estuaries:
1. Estuaries are located at the river mouth, where river meets the sea.
2. Estuary has very little wave action. So it provides a calm refuge to sea and also shelter to many aquatic organisms.
3. It is the most productive region as it receives nutrients both from the rivers and the sea.
4. Predators are absent in estuaries.
Which of the above statements are correct?
a) 1,2 and 3
b) 2,3 and 4
c) 1,3 and 4
d) All of the above