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Trueman Solutions for Class 12 Biology II Chapter 15

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60 Qs

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Give three hypotheses for explaining why tropics show the greatest levels of species richness.

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What are the major causes of species losses in a geographical region?

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The species diversity of plants is much less that that of animals . What could be the explanations to how animals achieved greater diversification?

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What is the function of the National Bureau of Plant-Animal and Fish Genetic Resources?

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India is homeland of how many cultivated plants and their wild relatives.

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Name animal species for which India is centre of biodiversity.

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Name animal species for which India is secondary centre of domestication.

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Name crop plants, fruit plants and vegetables for which India is the centre of biodiversity.

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Name the region of biosphere reserve which is legally protected and where no human activity is allowed.

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Match the words in column I with those of column II

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India has more than strains of rice. Mention the level of biodiversity it represents.

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One Mark Questions :
Write the importance of cryopreservation in conservation of biodiversity.

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Name the type of biodiversity represented by different strains of rice in India

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One Mark Questions :
Name the type of biodiversity represented by the following :
varieties of mangoes in India.

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Identify (A) and (B) in the figure given here representing number of major vertebrate taxa.

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Giving two reasons explain why there is more species of biodiversity in tropical latitudes than in temperate ones.

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Alien species are a threat to native species. Justify taking examples of an animal and plant alien species.

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In the biospere immense biological diversity exists at all levels of biological organisation. Explain any two levels of biodiversity.

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Biodiversity must be conserved as it plays an important role in many ecosystem services that nature provides. Explain any two services of the ecosystem.

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Why certain regions have been declared as biodiversity "hot spots" by environmentalists of the world? Name any two "hot spot" regions of India.

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State the use of biodiversity in modern agriculture.

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Two Mark Questions :
The graph shows species-area relationship, Write the equation of curve 'a' and explain.

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Differentiate between in situ and ex situ approaches of conservation of biodiversity.

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Justify with example where a deliberate attempt by humans has led to the extinction of particular species.

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Where would you expect more species biodiversity in tropics or in polar regions ? Give reasons in support of your answer.

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"Stability of a community depends upon its species richness" Write how did David Tilman show this experimentally.

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What is meant by "alien species" invasion? Name one plant and one animal alien species that are a threat to our Indian native species.

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List any four techniques where principle of ex-situ conservation of biodiversity has been employed.

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Mention the kind of biodiversity of more than a thousand varieties of mangoes in India represent. How is it possible?

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Why are sacred groves highly protected?

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A particular species of wild cat is endangered. In order to save it from extinction which is a desirable approach, in situ or ex situ. Justify your answer and explain the difference between the two approaches.

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Why are (i) alien species invasion and (ii) Loss of habitat and fragmentation, considered to be the major cause of loss of biodiversity? Explain with the help of one example each.

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Alien species are highly invasine and are a threat to indigenous species. Substantiate this statement with any three examples.

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The graph shows species area relationship. Answer the following
Name the naturalist who studied two kind of relationship shown in the graph. Write the observation made by him

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There are many animals that have become extinct in the wild but continue to be maintained in zoological parks.
(a) What type of biodiversity conservation is observed in this case?
(b) Explain any other two-ways which help in this type to conservation.

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Since the origin of life on earth, there are five episodes of mass extinction of species. 
How is the 'sixth extinction' presently in progress different from the previous episodes?

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Explain giving three reasons, why tropics show  greatest levels of species diversity

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Many plant and animal species are on the verge of their extinction because of loss of forest land by indiscriminate use by humans. As a biology student what method would you suggest along with its advantage that can protect such threatened species from getting extinct.

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Compare narrowly utilitarian and broadly utilitarian approaches to conserve biodiversity with the help of suitable examples.

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Write short notes on the following.
Ex-situ conservation

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 What is biodiversity? Why has it become important recently?

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What kind of threats to biodiversity may lead to its loss?

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Taking on example each of habitat loss and fragmentation, explain how are the two responsible for biodiversity loss.

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Why should we conserve biodiversity? How can we do it?

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We often read in newspapers that leopard, tiger, lion, crocodile or elephant has killed human beings and their livestock. Even then, government of India, is creating more and more reserves for them, some 43 alone for tigers. Why?

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Wetlands are breeding places of mosquitoes. Even then they are very important for maintaining ecological balance. How?

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India is one of the seventeen megadiversity centres of the world. It has three of 34 hotspots of biodiversity. What do you understand by the two terms. State the values attached to them?

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Name the type of biodiversity represented by the Estuaries and alpine meadows in India

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Name the type of biodiversity represented by the following :
Variations in terms of potency and concentration of reserpine in Rauwolfia vomitoria growing in different regions of Himalayas.

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The graph shows species area relationship. Answer the following
Write the situations as discovered by ecologists when the value of '' (slope of line) lies between
(i) 0.1 and 0.2
(ii) 0.6 and 1.2
What does '' stand for 

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The graph shows species area relationship. Answer the following
When would the slope of line '' become steeper? 

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Since the origin of life on earth, there are five episodes of mass extinction of species. 
Who is mainly responsible for the sixth extinction?

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Since the origin of life on earth, there are five episodes of mass extinction of species. 
List any four points that can help overcome this disaster.

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Write short notes on the following.
Hot spots of biodiversity

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Write short notes on the following.
Biosphere reserves

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Write short notes on the following.
IUCN Red List

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Write short notes on the following.
Protected areas.

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Describe the uses of biodiversity.

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Explain two different ways of biodiversity conservation.

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Explain the importance of biodiversity hot spots and sacred groves.

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