NCERT Exemplar solutions for बायोलॉजी इग्ज़ेम्प्लार [अंग्रेजी} कक्षा १२ chapter 15 - Biodiversity and Conservation [Latest edition]

Which of the following countries has the highest biodiversity?

Which of the following is not a cause for loss of biodiversity?

Which of the following is not an invasive alien species in the Indian context?

Where among the following will you find pitcher plant?

Which one of the following is not a major characteristic feature of biodiversity hot spots?

Match the animals given in column I with their location in column II:

Choose the correct match from the following:

What is common to the following plants: Nepenthes, Psilotum, Rauwolfia and Aconitum?

The one - homed rhinoceros is specific to which of the following sanctuary?

Amongst the animal groups given below, which one appears to be more vulnerable to extinction?

Which one of the following is an endangered plant species of India?

What is common to lantana Eichhomia and African catfish?

The extinction of passenger pigeon was due to ______.

Which of the following statements is correct?

Among the ecosystem mentioned below where can one bind maximum biodiversity?

Which among the following forests is known as the "lungs of the planet earth"?

The active chemical drug resespite is obtained from ______.

Which of the following group exhibit more species diversity?

Which of the below mentioned regions exhibit lees seasonal variations?

The Historic convention on Biological Diversity held in Rio de Janeiro in 1992 is known as ______.

What is common to the techniques (i) in vitro fertilisation, (ii) Cryo preservation and (iii) tissue culture?

What characteristics make a community stable?

What could have triggered mass extinctions of species in the past?

What accounts for the greater ecological diversity of India?

According to David Tilman, greater the diversity, greater is the primary productivity. Can you think of a very low diversity man-made ecosystem that has high productivity?

What does 'Red' indicate in the IUCN Red list (2004)?

Explain as to how protection of biodiversity hot spots alone can reduce up to 30% of the current rate of species extinction.

What is the difference between endemic and exotic species?

How does species diversity differ from ecological diversity?

Why is genetic variation important in the plant Rauwolfia vomitoria?

What is Red Data Book?

Define gene pool.

What does the term ‘Frugivorous’ mean?

What is the expanded form of IUCN?

Define the terms bioprospecting

Define the terms endemism

What is common to the species shown in figures A and B?

A	B

What is common to the species shown in figures A and B?

A	B

How is the presently occurring species extinction different from the earlier mass extinctions?

Of the four major causes for the loss of biodiversity (Alien species invasion, habitat loss and fragmentation, over-exploitation and co-extinctions which according to you is the major cause for the loss of biodiversity? Give reasons in support.

Discuss one example, based on your day-to-day observations, showing how loss of one species may lead to the extinction of another.

A species-area curve is drawn by plotting the number of species against the area. How is it that when a very large area is considered the slope is steeper than that for smaller areas?

Is it possible that productivity and diversity of a natural community remain constant over a time period of, say one hundred years?

There is greater biodiversity in tropical /subtropical regions than in temperate region. Explain.

Why are the conventional methods not suitable for the assessment of biodiversity of bacteria?

What criteria should one use in categorizing a species as threatened?

What could be the possible explanation for greater vulnerability of amphibians to extinction as compared to other animal groups?

How do scientists extrapolate the total number of species on Earth?

Humans benefit from diversity of life. Give two examples.

List any two major causes other than anthropogenic causes of the loss of biodiversity.

What is an endangered species? Give an example of an endangered plant and animal species each?

What are sacred groves and their role in biodiversity conservation?

Suggest a place where one can go to study coral reefs, mangrove vegetation and estuaries.

Is it true that there is more solar energy available in the tropics? Explain briefly.

Explain the concept of "co-extinction" by taking two examples.

Elaborate how invasion by an alien species reduces the species diversity of an area.

How can you, as an individual, prevent the loss of biodiversity?

Can you think of a scientific explanation, besides analogy used by Paul Ehrlich, for the direct relationship between diversity and stability of an ecosystem?

Though the conflict between humans and wildlife started with the evolution of man, the intensity of conflict has increased due to the activities of modern man. Justify your answer with suitable examples.

What is an ecosystem service? List any four important ecosystem services provided by the natural ecosystems. Are you in favour or against levying a charge on the service provided by the ecosystem?

Describe the consumptive use value of biodiversity as food, drugs and medicines, fuel and fiber with suitable examples.

Species diversity decreases as we move away from the equator towards the poles. What could be the possible reasons?

Explain briefly the ‘rivet popper hypothesis’ of Paul Ehrlich.

The relation between species richness and area for a wide variety of taxa turns out to be a rectangular hyperbola. Give a brief explanation.