Tag: evs

Questions Related to evs

Which of the following statements is correct?

evs interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

  1. Two species may not live in the same habitat.

  2. The more dissimilar the niches of two species , the stronger is competition between them.

  3. No two species can occupy exactly the same niche in the same geographical area.

  4. All of these

Show answer
Correct Option: C
Explanation:

According to the competitive exclusion principle, no two species can occupy exactly the same niche in exactly the same habitat at exactly the same time. Two species whose niches overlap may evolve by natural selection to have more distinct niches, resulting in resource partitioning.

So the correct answer is 'No two species can occupy exactly the same niche in the same geographical area.'

All of the following components are present in the secretion of parotid and submaxillary glands, except

evs interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

  1. Lysozyme

  2. Thicyanate ion

  3. Maltase

  4. Ptyalin

Show answer
Correct Option: A
Explanation:

Inside a cell, numerous organelles function to remove wastes. The lysosome is the organelle involved in digestion and waste removal because they contain digestive enzymes which are not present in the secretion of the parotid.

So, the correct option is 'Lysosome'.

Environment protection act was enforced in the year ____

evs interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

  1. 1986

  2. 1925

  3. 1900

  4. 1958

Show answer
Correct Option: A
Explanation:

The Environment (Protection) Act 1986 came into force soon after the Bhopal Gas tragedy. Thereafter, which a large number of laws came into existence as the problems began arising.

Which of the following is a salt rich habitat?

evs interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

  1. Saline soils

  2. Tidal marshes and mangroves

  3. Coastal dunes and saline soils

  4. All of the above

Show answer
Correct Option: D
Explanation:

A salt-rich habitat is the type of habitat which has plenty of minerals and salts in it. Salt marshes are coastal wetlands that are flooded and drained by salt water brought in by the tides. Saline soils are the ones that have the input of salt water in it. Coastal dunes are immediate landward of the beach are commonly found large, linear accumulations of sand known as dunes. 

Therefore all of the above are rich in salts and are salt-rich habitats. 
So the correct answer is ' All of the above'. 

Human habitations and installations occupy land area

evs interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

  1. 36.6%

  2. 16.6%

  3. 2.6%

  4. 0.6%

Show answer
Correct Option: C
Explanation:
One-fourth of earth's area is land which is covered by forests, agricultural farms and the urban and rural habitats of man. Out of total land area on earth, 52% of land is covered by forests, 20 % is occupied by deserts, 11% is occupied by agricultural farms and 2.6% is occupied by human settlements.
So, the correct answer is '2.6%'.

State whether the following statements are true or false.
Factors that oppose biotic potential characterize environmental resistance

evs interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Environmental resistance factors are all the things that keep a population of organisms from endlessly increasing. They lower the chances for reproduction, affect the health of organisms, and raise the death rate in the population. Environmental resistance factors include factors that are biotic (living) and abiotic (non-living). Biotic factors are things like predation, parasitism, lack of food, competition with other organisms and disease. Abiotic factors include drought, fire, temperature, and even the wrong amount of sunshine. 

So the given statement is true.

Read the following statements and select the correct ones. 
(i) All the color components of the visible spectrum are available for marine plants living in different depths of the ocean.
(ii) Many herbs and shrubs in rain forests adapt to photosynthesis optimally under very low light conditions as they grow under canopy trees. 
(iii) Gradual increasing in average global temperature will affect the distributional range of some species.
(iv) The quality of sol does not depend upon the weathering process. 

evs interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

  1. (i) and (ii)

  2. (ii) and (iv)

  3. (ii) and (iii)

  4. (i) and (iv)

Show answer
Correct Option: C
Explanation:

(i) At depth, the first colour to get absorbed is red then red and then yellow. Even water at 5Ft depth gets a noticeable loss of red.

(ii)By growing in canopy trees the herbs and shrubs adapt to photosynthesis under very low light.
(iii)There is some distributional range of different species if there is a gradual increase in average global temperature then it will affect it.
(iv)The quality of sol does highly depend on the weathering process.
So, the correct option is (ii) and (iii).

Consider the following four conditions and select correct pair about desert lizards.
(i) Burrowing in the soil to escape high temperature. 

(ii) Losing heat rapidly from the body during high temperature. 
(iii) Bask in the sun when the temperature is low. 
(iv) Insulating body due to the thick fatty dermis.

evs interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

  1. i, iv

  2. i, ii

  3. iii, iv

  4. i, iii

Show answer
Correct Option: D
Explanation:

Desert lizards manage to keep their body temperature constant by behavioral means. They bask in sun and absorb heat when their body temperature drops but move into shades when ambient temperature starts increasing. So the correct option is " i,iii"

When domestic sewage mixes with river water

evs contaminated water spreads disease mosquitoes and malaria diseases caused by mosquitoes water borne diseases

  1. Small animals like rats will die after drinking river - water

  2. The increased microbial. activity releases micronutrients such as iron

  3. The increased microbial activity uses up dissolved oxygen

  4. The river water is still suitable for drinking as impurities are only about 0.1%

Show answer
Correct Option: A
Explanation:

BOD (biochemical oxygen demand) refers to the amount of the oxygen that would be consumed if all the organic matter in one liter of water were oxidized by bacteria. The BOD test measures the rate of update of oxygen by microorganisms in a sample of water and thus, indirectly BOD is the measure of the organic matter present in the water. The greater the BOD of wastewater more is its polluting potential. 

So, the correct answer is 'Small animals like rats will die after drinking river - water'.

Larger amount of dissolved oxygen in water, faster will be

evs contaminated water spreads disease mosquitoes and malaria diseases caused by mosquitoes water borne diseases

  1. Turbidity

  2. Reaeration

  3. Self Purification

  4. Currents

Show answer
Correct Option: C