Improvement In Food Resources- 2 - Free MCQ Practice Test with solutions,

In India, as in many other agriculture-based countries, farming ranges from small to very large farms. Different farmers thus have more or less land, money and access to information and technologies

Canals: This is usually an elaborate and extensive irrigation system. In this system canals receive water from one or more reservoirs or from rivers. The main canal is divided into branch canals having further distributaries to irrigate fields
Correct Answer:
- A: To irrigate fields

Tanks are described as small storage reservoirs that intercept and store the runoff from smaller catchment areas, ensuring water is retained for various uses. They are not natural lakes, underground channels, or artificial canals.

Canals receive water from:

• Rivers: Canals often divert water from rivers to distribute it for irrigation or navigation.
• Reservoirs: These are man-made lakes that store water, which can be released into canals as needed.

This makes option C the correct answer since canals can receive water from one or more reservoirs or rivers, providing a controlled water supply for various uses.

Correct Answer:
c) competing for various resources of crops (plants) causing low availability of nutrients

Explanation:

Weeds primarily affect crop plants by competing with them for essential resources such as nutrients, water, and sunlight. This competition can result in the crop plants receiving insufficient resources for optimal growth and development, ultimately reducing their yield.

• Option a: Although weeds may interfere with the growth of crops, the phrase "killing of plants in field before they grow" is not an accurate or common description of how weeds affect crops.

• Option b: The statement "dominating the plants to grow" is ambiguous and does not clearly describe the competitive nature of weeds.

• Option c: This accurately captures the primary mode of interference—competition for resources—which leads to a lower availability of nutrients and other vital resources for the crop plants.

• Option d: Since options a and b are not correct, this option is not applicable.

Thus, the correct answer is c).

- Catlas fish feed on the surface of the water body.
- They primarily consume floating food items and plankton found near the water's surface.
- This feeding behavior helps them target their prey efficiently.

• When two genetically dissimilar plants of the same species are crossed, it is called intervarietal cross (also called hybridisation).
• Interspecific cross = cross between two different species.
• Intergeneric cross = cross between two different genera.

The system of culturing several species of fish together is known as composite fish culture. This method involves:

• Using five or six species of fish with different food habits.
• Maximising the use of available food resources in a fishpond.
• Reducing competition for food among the fish.

Composite fish culture improves yield by making efficient use of the pond ecosystem.

Continuous use of fertilisers can negatively impact soil fertility due to several reasons:

• Organic matter is not replenished, leading to nutrient depletion over time.
• Soil microbes are harmed, which disrupts the natural nutrient cycle and soil health.