Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to: 

$1$. Resist drought and increase the porous area.

$2$. Tolerate extremes of pH.

$3$. Resist disease infestation.

Select the correct answer using the codes given below.

In India, the overall index of Industrial Production, the indices of eight core industries have a combined weight of 37-90%. Which of the following are among those eight core industries?  

1. Cement

2. Fertilizers

3. Natural gas

4. Refinery products

5. Textiles

Select the correct answer using the codes given below:

The government of India encourages the cultivation of ‘sea buckthorn’. What is the importance of this plant?  

$1$. It helps in controlling soil erosion and in preventing desertification.

$2$. It is a rich source of biodiesel.

$3$. It has nutritional value and is well-adapted to live in cold areas of high altitudes.

$4$. Its timber is of great commercial value.

Which of the statement(s) given above is /are correct?

Which of the following is the chief characteristic of ‘mixed farming’?  

Consider the following crops of India,

1. Cowpea 2. Green gram 3. Pigeon pea.

Which of the above is/are used as pulse, fodder and green manure?

Consider the following factors.

$1$. Rotation of the Earth

$2$. Air pressure and wind

$3$. Density of ocean water

$4$. Revolution of the Earth

Which of the above factors influence the ocean currents?

Consider the following crops of India,

1. Groundnut

2. Sesamum

3. Pearl millet

Which of the above is/are predominantly rainfed crop/crops?

Normally, the temperature decreases with the increase in height from the Earth's surface because:

$1$. The atmosphere can be heated upwards only from the Earth's surface.

$2$. There is more moisture in the upper atmosphere.

$3$. the air is less dense in the upper atmosphere.

Select the correct answer using the codes given below:

The acidification of oceans is increasing. Why is this phenomenon cause of concern? 

1. The growth and survival of calcareous phytoplankton will be adversely affected.

2. The growth and survival of coral reefs will be adversely affected.

3. The survival of some animals that have phytoplankton larvae will be adversely affected.

4. The cloud seeding and formation of clouds will be adversely affected.

Which of the statement(s) given above is /are correct?