Which of the following statements are true?

l. Species diversity provides stability to the ecosystem.

ll. Communities with more species tend to the more stable than those with less species.

lll. Ecosystems with higher biodiversity are more productive than ecosystems with lower biodiversity

lV. Biodiversity is not essential for the maintenance and health of ecosystems.

 Choose the correct option:-

1. l, ll and lll

2. l, ll and lV

3. ll, lll and lV

4. l, ll, lll and lV

l. Higher latitude $\stackrel{Biodversity increases}{\to }$ Lower latitude

     (Poles)                                         (Equator)

ll. Higher latitude $\stackrel{Biodiversity decreases}{\to }$ Lower latitude

     (Poles)                                          (Equator)

lll. Higher altitude $\stackrel{Biodversity increases}{\to }$ Lower altitude

     (Mountain top)                              (Sea level)

lV. Higher altitude  $\stackrel{Biodiversity decreases}{\to }$ Lower altitude

     (Mountain top)                              (Sea level)

Which of the matches above is/are correct?

1. l and lll 

2. l and ll 

3. ll and lll

4. lll and lV

The impacts of the loss of biodiversity may lead to:-

(I) Lowered resistance to environmental perturbation.

(II) Decrease in plant production.

(III) Increase variability in ecosystem processes like water use, pest/disease cycle, plant productivity.

(IV) Increase in plant production.

Choose the correct option:-

1. I and II

2. I and IV

3. I and III 

4. I, II, and III

Loss of biodiversity in a region may lead to :-

1. Decline in plant production
2. Lowered resistance to environmental condition such as drought
3. Increased variability in certain ecosystem process
4. All

Sacred groves are example of in situ conservation are found in :-

(a) Khasi and Jaintia – In Meghalaya 
(b) Aravalli hills – In Rajasthan
(c) Chanda and Bastar – In Madhya Pradesh
(d) Western ghats – In Karnataka

1. a, b Only

2. b, c Only

3. a, c Only

4. a, b, c, d

According to Alexander Von Humboldt's species area relationship formula
log S = log C + Z log A
What does Z show :-

1. Species richness

2. Regression coefficient

3. Intercept

4. Area

Many species like Steller's sea cow and passenger pigeon have been extinct. Which of the following describes this situation?

1. Overexploitation by humans

2. Pollution

3. Habitat loss

4. Competition from introduced species

Communities with more species tend to be more stable than those with less species. This was confirmed by:-

1. Alexander von Humboldt

2. David Tilman

3. Paul Ehrlich

4. Edward Wilson

Which one of the following is not a broadly utilitarian aspect of biodiversity ?

1. Pollination

2. Climate moderation

3. Source of Oxygen

4. Source of medicine 

The historic convention on biological diversity (The earth summit) held in    A     in    B   .

1. A-Rio de Janeiro, B-1992

2. A-Johannesburg, B-2002

3. A-Rio de Janeiro, B-2002

4. A-Johannesburg, B-1992