Test: Improvement In Food Resources- 2 - Class 9 MCQ

Indian cattle are a specific breed of cattle found in India. Let's analyze each option:

 

(i) Bos indicus: This is a scientific name for the Indian zebu cattle, which are commonly found in India. They are characterized by a hump on their back and large ears. This is a correct answer.

 

(ii) Bos domestica: This is not a specific breed of cattle. It is a term used to refer to domesticated cattle in general. This is not an Indian cattle.

 

(iii) Bos bubalis: This is a scientific name for the water buffalo, which is commonly found in India. Water buffalo is considered as Indian cattle. This is a correct answer.

 

(iv) Bos vulgaris: This is not a specific breed of cattle. It is a term used to refer to the wild ancestor of domesticated cattle, known as Aurochs. This is not an Indian cattle.

 

Answer: Indian cattle breeds are (i) Bos indicus and (iii) Bos bubalis.

 

 

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.

Weeds affect the crop plants by:

Killing of plants in the field before they grow:
- Weeds can outcompete crop plants for sunlight, water, and nutrients, leading to the death of young crop plants before they can establish and grow.

Dominating the plants to grow:
- Some aggressive weed species can grow rapidly and form dense stands, dominating the available space and resources, which hinders the growth and development of crop plants.

Competing for various resources of crops (plants) causing low availability of nutrients:
- Weeds compete with crop plants for nutrients, water, and space. This competition can result in limited availability of essential resources for the crop plants, leading to stunted growth, reduced yields, and overall poor crop health.

All of these:
- Weeds can have a combined impact on crop plants, including killing young plants, dominating available space, and competing for vital resources. This comprehensive effect can severely affect crop productivity, quality, and economic value.

In conclusion, weeds can have a detrimental impact on crop plants by killing young plants, dominating growth space, and competing for essential resources. It is crucial for farmers to implement effective weed management strategies to minimize the negative effects of weeds and ensure optimal crop growth and productivity.

- 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.

Intervarietal hybridization is the process in which parents involved in hybridization belong to the same species but different varieties. For example, crossing of two varieties of wheat or other crops. Interspecific hybrids are bred by mating two species, normally from within the same genus but different species.

Answer:
The correct answer is B: Composite fish culture.
Explanation:
Composite fish culture is a system of culturing multiple species of fish with different food habits in a fishpond. This method is widely practiced in aquaculture to maximize fish production and optimize the utilization of resources. Here is a detailed explanation of each option:
- Mariculture: Mariculture refers to the cultivation of marine organisms in the ocean or other saltwater environments. It involves the farming of various marine species such as fish, shellfish, and seaweed.
- Composite fish culture: Composite fish culture involves the culture of multiple species of fish with different feeding habits in the same fishpond. The combination of different species helps in utilizing the available resources efficiently and reducing competition for food.
- Capture fishing: Capture fishing refers to the practice of catching fish from natural water bodies like rivers, lakes, and oceans using various fishing gears and techniques.
- Pisciculture: Pisciculture is a broader term that encompasses the breeding, rearing, and culture of fish, including both freshwater and marine species. It involves activities such as fish farming, hatchery operations, and stocking of fish in natural water bodies.
In conclusion, the system of culturing five or six species of fish with different food habits in a fishpond is known as composite fish culture.

Continuous use of fertilisers can destroy soil fertility because:
1. Organic matter is not replenished:
- Fertilisers primarily provide essential nutrients to plants, but they do not replenish organic matter in the soil.
- Organic matter, such as decomposed plant and animal materials, is crucial for maintaining soil fertility.
- It improves soil structure, water-holding capacity, nutrient retention, and provides a habitat for beneficial soil organisms.
2. Microbes in the soil are harmed:
- Continuous use of fertilisers can negatively impact the microbial population in the soil.
- Soil microbes play a vital role in nutrient cycling, decomposition of organic matter, and maintaining soil health.
- Fertilisers can alter the microbial community composition and reduce the diversity and activity of beneficial soil microbes.
3. Soil becomes hard:
- Excessive use of fertilisers can lead to the accumulation of salts in the soil, causing soil salinization.
- Salinization can result in the hardening of the soil, making it difficult for plant roots to penetrate and access water and nutrients.
- This can impede plant growth and decrease soil fertility over time.
Conclusion:
Continuous use of fertilisers without replenishing organic matter can lead to a decline in soil fertility. The absence of organic matter and the harm caused to soil microbes can disrupt nutrient cycling and reduce the overall health of the soil. Additionally, excessive fertiliser use can contribute to soil salinization, resulting in soil hardening and reduced plant growth. It is therefore important to adopt sustainable soil management practices that incorporate organic matter additions and minimize excessive reliance on fertilisers to maintain long-term soil fertility.