Biodiversity

1 Mark Questions

1.Identify A and B in the figure given below representing proportionate number of major vertebrate taxa. [Delhi 2014]

-Birds Fishes

Reptiles

Ans. In the above mentioned figure, among the major vertebrate taxa

A represent mammals

B represents ambhibians (1)

1. Write the level of biodiversity represented by a mangrove. Give another example falling in the same level. [Delhi 2014C]

Ans. The mangroves represents biodiversity at ecological level. Other examples of ecological diversity are deserts, rainforests, coral reefs, etc.

1. Name the type of biodiversity represented by the followings

• 1,000 varieties of mangoes in India.
• Variations in terms of potency and concentration of reserpine in Rauwolfia vomitoria growing in different regions of Himalayas. [All India 2013]

Ans. (i) Genetic diversity

1. Genetic diversity
2. Why is tropical environment able to support greater species diversity? [Delhi 2011C]

Ans. Tropical latitudes have remained undisturbed for millions of years and had a long evolutionary time for species diversification. Thus, it supports greater species diversity.

1. Eichhornia crassipes is an alien hydrophyte introduced in India. Mention the problem posed by this plant.[All India 2010C]

Ans. Water hyacinth (Eichhornia) introduced in India is threatening the existing aquatic life in ponds and lakes, etc., as it clogs the stagnant water bodies very fast, thus, the native species are endangered.

1. The Amazon rainforest is referred to as the lungs of planet. Mention any one human

activity which causes loss of biodiversity in this region. [All India 2010C]

Ans. Human activity causing loss of biodiversity are:

1. Many plants are cut in Amazon rainforest
2. Forests are converted to grasslands for raising beef cattle.
3. Name the unlabelled areas A and B of the pie chart representing biodiversity of vertebrates showing the proportionate number of species of major taxa. [Foreign 2009]

- Mammals

Birds

Reptiles

Ans. A- Fishes

B- Amphibians

1. Name the unlabelled areas A and B of the pie chart representing the global biodiversity of

invertebrates showing their proportionate number of species of major taxa. [Delhi 2009]

В Crustaceans Other animal groups

Ans. A-Insects

1. Molluscs
2. Name the unlabelled areas A and B of the pie chart representing the biodiversity of plants showing their proportionate number of species of major taxa. [All India 2009]

Mosses Ferns В Algae Lichens

Ans. A- Fungi

1. Angiosperms
2. About 200 species of cichlid fish became extinct when a particular fish was introduced in Lake Victoria of Africa. Name the invasive fish. [Foreign 2008]

Ans. Nile perch is the invasive fish introduced in Lake Victoria.