Effect of Human Activities

Q. Which of the following reasons are responsible for the decrease in the water spread area of the Kolleru lake?

1. Commercial expansion of aquaculture
2. Occupying lake area for crop cultivation
3. Construction of bunds
4. Construction of industries

Q.

The main cause for abundant Coliform bacteria in the river Ganga is

1. disposal of unburnt corpses into water

2. discharge of effluents from electroplating industries

3. washing of clothes

4. immersion of ashes

Q. A recent case study conducted in the Edulabad Water Reservoir (EBWR) has shown that the accumulation of heavy metals in fishes is more in the pre-monsoon season than the monsoon season. Which of the following statements supports the seasonal change in accumulation?

1. Increased acidic condition of the water
2. Decreased acidic condition of the water
3. Increased temperature of the water
4. Decreased temperature of the water

Q. During the sparrow campaign in China, the farmers killed all the sparrows creating an imbalance in the ecosystem. Which of the following options would have been logical and safe to protect the crop against locusts?

1. Spray the crops with pesticide
2. Hand pick them off the crops
3. Burn the branches with locusts
4. Bring in predators that feed on locusts

Q.

What are CFCs?

Q. Which disrupted food chain led to the Great Chinese Famine?

1. Plants $\to$ Sparrow $\to$ Snake
2. Plants $\to$ Locust $\to$ Mouse
3. Plants $\to$ Grasshopper $\to$ Sparrow
4. Plants $\to$ Locust$\to$ Sparrow

Q. Which of the following are responsible for Kolleru lake pollution?

1. Agrochemicals
2. Fertilizers
3. Effluents
4. Sewage

Q.

Growing different crops alternatively can increase the yield. justify the statement.

Q. Which of the following activities were significantly affected by the Kolleru Lake pollution?

1. Urban settlements
2. Industrial catchments
3. Bird migration
4. Agricultural farms

Q.

What does Crop rotation ensure?

Q. Which of the following is not the impact of Sparrow Campaign?​

1. Plenty of sparrows were there to eat locusts.​
2. Use of pesticides further degraded the land.​
3. It led to the initiation of Chinese famine.​
4. Crop yields were substantially decreased.​

Q. Which of the following activitie(s) is/are responsible for the occurrence of water borne diseases in the Kolleru lake?

1. Agricultral activities
2. Sewage discharge
3. Industrial effluents
4. Sediments from plains

Q. Which of the following is/are disadvantage(s) of using chemical pesticides?

1. It gets accumulated in animals.
2. The pests are destroyed completely.
3. It kills the beneficial microorganisms.
4. It leads to environmental and health issues.

Q. The water holding capacity of Kolleru lake has been reduced due to

1. Urbanization
2. Eutrophication
3. Dam construction
4. Both A and B

Q.

Chemicals that kill weeds are known as herbicides.

1. True
2. False

Q.

Which of the following measures will you take to avoid soil pollution?

1. Lesser use of pesticides.
2. Planting of more trees.
3. Limited use of fertilizers.
4. Burying plastic wastes in soil.

Q. Crop rotation is the year round cultivation of a single crop.

1. True
2. False