Tag: biodiversity: conservation

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Questions Related to biodiversity: conservation

Multiple choice biology option c: ecology and conservation hotspots and methods of conservation biodiversity: conservation conservation of biodiversity

Bioindicators are used for knowing

  1. Minerals

  2. Oxygen demand

  3. Air pollution

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Bioindicators are living organisms such as plants, animals, and microorganisms that are used as indicators. They are used for knowing the different content of an ecosystem such as minerals, oxygen demand, air pollution. Lichens are used for knowing air pollution. Algae bloom indicates large amount of nitrates and phosphates in lakes and rivers.

Thus, the correct answer is 'All of the above.'

Multiple choice biology option c: ecology and conservation hotspots and methods of conservation biodiversity: conservation conservation of biodiversity

Statement 1 : BOD represents the amount of dissolved oxygen that would be consumed if all the organic matter in one litre of water were oxidised by microorganisms.
Statement 2 : High value of BOD indicates that water is highly polluted by organic matter.

  1. Both statements 1 and 2 are correct.

  2. Statement 1 is correct but statement 2 is incorrect.

  3. Statement 1 is incorrect but statement 2 is correct.

  4. Both statements 1 and 2 are incorrect.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
BOD is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a given water sample at certain temperature.
High BOD indicates the water is highly polluted because the dissolved oxygen is  already consumed by bacteria.
So, the correct option is 'Both statements 1 and 2 are correct'
Multiple choice biology option c: ecology and conservation hotspots and methods of conservation biodiversity: conservation conservation of biodiversity

More than ........... $\%$ of the world population live in arid or semiarid regions.

  1. $40$
  2. $50$
  3. $60$
  4. $80$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The arid region is a region which is characterized by a severe lack of available water. Due to lack of water, it prevents and hinders the growth and development of plant and animal life. Arid climates tend to lack vegetation. The semiarid region is partially dry or partially arid. It is intermediate between arid and humid climate. More than 40% of the world population live in arid or semiarid regions.

Thus, the correct answer is '40.'

Multiple choice biology option c: ecology and conservation hotspots and methods of conservation biodiversity: conservation conservation of biodiversity

Which of the following is absent in polluted water : -

  1. Hydrilla

  2. Water hyacinth

  3. Larva of stone fly

  4. Blue green algae
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Stoneflies are exopterygote insects with aquatic nymphs; long antennae, biting mouthparts and a weak flight. Adults have the tendency to feed on lichens and unicellular algae. These are good pollution indicators. Stonefly (Plecoptera order) larva requires well-aerated, non-polluted water. It is absent in polluted water.

So, the correct answer is 'Larva of stonefly'.
Multiple choice biology option c: ecology and conservation hotspots and methods of conservation biodiversity: conservation conservation of biodiversity

Lichen is indicator of 

  1. $CO _2$ pollution
  2. $SO _2$ pollution

  3. CO pollution

  4. water pollution
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lichen is a symbiotic association between algae and fungi known as phycobiont and mycobiont component respectively. Lichens are very good pollution indicators as they do not grow in SO$ _2$ polluted environments.

So, the correct answer is 'SO$ _2$ pollution'.