Tag: significance of biodiversity

Questions Related to significance of biodiversity

State whether the following statements are true or false.
All the physiological requirements and activities of a species in its normal surroundings make up its habitat  

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

  1. True

  2. False

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Correct Option: B
Explanation:

An organisms niche and not the habitat describes its location, requirements and work within a particular community or ecosystem. If two species occupy the same niche they will generally compete with one another until one is displaced.

So, the correct option is 'False'.

State whether the following statements are true or false.
Pheromones are chemical substances, meant for. communication and coordination of organs in an individual.

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

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

A pheromone is a secreted or excreted chemical factor that triggers a social response in members of the same species meant for communication and coordination. Pheromones are chemicals capable of acting outside the body of the secreting individual to impact the behavior of the receiving individual.

So, the correct option is 'True'.

Statement 1 : Cow in India and Kangaroo in Australia (boot herbivores) are ecological equivalents. 
Statements 2 : The organisms having similar niche in different geographical regions are known as ecological equivalents. 

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

  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

Show answer
Correct Option: A
Explanation:

Ecological equivalents are the organisms that occupy same niche iin different habitats (or geographical areas) e.g. both one and cat feed on shews and mice, they occupy the same niche through their habitats are different. 

Lichens and Mosses are the charateristic vegetation of

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

  1. Tundra region

  2. Temperate region

  3. Mediterranean region

  4. Hot desert region

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Correct Option: A
Explanation:

Tundras are among Earth's coldest, harshest biomes. Tundra ecosystems are treeless regions found in the Arctic and on the tops of mountains, where the climate is cold and windy and rainfall is scant. So, the correct option is "Tundra region".

 Seasonal variations on Earth occur due to its 

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

  1. tilted axis

  2. rotation around its own axis

  3. revolution around sun

  4. both (a) and (c)

Show answer
Correct Option: D
Explanation:

The revolution of our planet around the Sun and the tilt of axis cause annual variations in the intensity and duration of temperature, resulting in distinct seasons. These variations together with annual variation in precipitation account for the formation of major biomes such as desert, rain forest, and tundra. 

So the correct option is 'both (a), and (c)'.

Organism adapt to their habitat by which of the following means?

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

  1. Changes in body

  2. Changes in behaviour

  3. Changes in location

  4. All of the above

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Correct Option: D
Explanation:

Every organism has its own ecosystem where it can survive but need to adapt to changes of habitat for survival.

Structural: Arctic foxes have small ears to retain body heat while desert foxes have large ears for heat radiation.
Physiological: These does not appear externally but based on metabolism it varies. Desert animals have more efficient kidneys and presence of toxins in the leaf to repel herbivores.
Behavioral: Desert animals are active at night during hot summer weather. Lizards seek a sunny spot in the morning to warm up to operating temperatures more quickly.
So the correct answer is 'All of the above'.

Select odd one out w.r.t Australian marsupials.

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

  1. Bobcat

  2. Wombat

  3. Bandicoot

  4. Spotted cuscus

Show answer
Correct Option: A
Explanation:

Bobcat is originated from North America whereas Wombat, Bandicoot, Spotted cuscus.

So, the correct option is 'Bobcat'.

Interaction of species with the environment is known as

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

  1. Ecosystem

  2. Autecology

  3. Synecology

  4. Community

Show answer
Correct Option: B
Explanation:

Group of same species in a given area is called population and interaction of population with environment is called Autoecology. So the correct option is " Autoecology"

Which one of the following is the region of cold temperature? 

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

  1. Mesosphere

  2. Thermosphere

  3. Ionosphere

  4. Exosphere

Show answer
Correct Option: A
Explanation:
A. Mesosphere is the layer just above the stratosphere and extends from 50-85 km. Temperature is about -90° C in this region.
B. Thermosphere is the layer above the mesosphere. Ultraviolet radiations can penetrate this layer and causes photodissociation of molecules. Temperature increases in this region.
C. Ionosphere is the region of upper atmosphere of Earth that extends from 60-1000 km. Ionization by solar radiation occurs in this region.
D. Exosphere is the outermost layer of Earth's which hardly contains air.
Hence,the region of cold temperature is Mesophere.
So, the correct answer is 'Mesophere'.

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.'