Question 4 :
The summit of Rio de Janeiro was convened for addressing urgent problems of development concerning.

Question 5 :
It is important to make small check dams across the flooded gullies because they-<br/>(i) &#160;&#160;hold water for irrigation.<br/>(ii) &#160;hold water and prevent soil erosion.<br/>(iii) &#160;recharge ground water.<br/>(iv) &#160;hold water permanently. <br/>Select the correct options from the above stated reasons-<br/>

Question 8 :
The sand particles in Indian Desert are uniformly rounded because of :

Question 9 :
The total area under forests in India is only ___ percent.

Question 10 :
In which of the following states deforestation caused land degradation due to mining?

Question 11 :
Which of the following is not a tropical type of soil?

Question 12 :
Match the following.<table class="wysiwyg-table"><tbody><tr><td>A. Alluvial Soil</td><td>$1$. Cotton</td></tr><tr><td>B. Black Soil</td><td>$2$. Rice</td></tr><tr><td>C. Brown Soil</td><td>$3$. Tea</td></tr><tr><td>D. Red Soil</td><td>$4$. Wheat</td></tr></tbody></table>

Question 15 :
Consider the following statements.<br>$1$. Alluvial soil is rich in chemical properties and is capable of yielding Rabi and Kharif crops.<br>$2$. Black soil is suitable for cotton, groundnut.<br>$3$. Rabi crops are reaped in autumn after sowing in June.<br>Which of these statements are correct?<br>

Question 18 :
Resources which are found in a region but have not been utilised are called __________.

Question 20 :
Assertion: Climate (temperature and rainfall) is an important factor of soil formation. Reason: Higher temperature and more rainfall speed up the process of soil formation.