1. Consider the following :
   1. Carbon dioxide
   2. Oxides of Nitrogen
   3. Oxides of Sulphur
   Which of the above is / are the emission / emissions from coal combustion at thermal power plants ?

1. 1. 1 only

   
   
   

   2. 2 and 3 only

   
   
   

   3. 1 and 3 only

   
   
   

   4. 1, 2 and 3 only

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

2. A study of a meadow ecosystem revealed the following tropic relationships :
   sweet clover - grasshoppers - toads - snakes. The primary producer (s) in the meadow is (are) .............

1. 1. Sweet clover

   
   
   

   2. Grasshoppers

   
   
   

   3. Toads

   
   
   

   4. Snakes

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

---

3. Bacteria and fungi act as ..........within an ecosystem.

1. 1. Primary producers

   
   
   

   2. Primary consumers

   
   
   

   3. Secondary consumers

   
   
   

   4. Decomposers

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

4. Wind erosion is one of the key causes of desertification and occurs when soil is left bare or vegetation. State the major cause of wind erosion in arid and semi-arid lands where this problem is most severe.

1. 1. Cleaning of land for agriculture

   
   
   

   2. Deforestation

   
   
   

   3. Overgrazing by livestock

   
   
   

   4. Forest fires

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

---

5. Which creature is featured on the logo for International Year of Biodiversity 2010 ?

1. 1. A greater flamingo

   
   
   

   2. A bison

   
   
   

   3. A whale

   
   
   

   4. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---