Match the following columns and select the correct option.

    (a)  (b)  (c)  (d)

1. (iii)  (ii)   (i)  (iv)

2. (ii)  (iii)  (iv)  (i)

3. (i)   (ii)   (iii)  (iv)

4. (iv)  (i)   (ii)  (iii)

Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their:

1. Growth response

2. Defence action

3. Effect on reproduction

4. Nutritive value

Which of the following is not an attribute of a population?

1.  Natality

2.  Mortality

3.  Species interaction

4.  Sex ratio

The process of growth is maximum during:

1. Lag phase

2. Senescence

3. Dormancy

4. Log phase

In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?

1. Gross primary productivity is always more than Net primary productivity.

2. Gross primary productivity and Net primary productivity are one and same.

3. There is no relationship between Gross primary productivity and Net primary productivity.

4. Gross primary productivity is always less than net primary productivity.

Match the trophic levels with their correct species examples in the green land ecosystem:

Select the correct option: 

Which of the following regions of the globe exhibits the highest species diversity?

1. Madagascar 

2. Himalayas

3. Amazon forests 

4. Western Ghats of India 

According to Robert May, the global species diversity is about:

1. 20 Million

2. 50 Million

3. 7 Million

4. 1.5 Million

Snow-blindness in Antarctic regions is due to:

1.  Inflammation of cornea due to high doses of UV-B radiation

2.  High reflection of light from snow

3.  Damage to the retina caused by infra-red rays

4.  Freezing of fluids in the eye by low temperature 

Montreal Protocol was signed if 1987 for control of:

(1) Emission of ozone-depleting substances

(2) Release of Green House Gases

(3) Disposal of e-waste

(4) Transport of Genetically modified organisms from one country to another