Here are 10 One-Word Answer Type Questions from the topic How Nutrients Are Replenished in the Soil (from your provided PDF), with answers and explanations after each question as requested:
One-Word Answer Type Questions
Topic: How Nutrients Are Replenished in the Soil
1. Question: What do farmers add to the soil to increase its nutrient content?
• Answer: Fertiliser
• Explanation: Farmers add fertilisers rich in nutrients like nitrogen, phosphorus, and potassium to replenish the nutrients in the soil.
2. Question: What natural substance is added to soil besides fertilisers to improve its fertility?
• Answer: Manure
• Explanation: Manure is made from animal waste and decomposed plant material and is used to enrich the soil with nutrients.
3. Question: Which nutrient in the soil decreases when crops are grown repeatedly?
• Answer: Nitrogen
• Explanation: Crop plants absorb nitrogen in large amounts from the soil, leading to a decline in nitrogen content over time.
4. Question: Name the bacteria that fix atmospheric nitrogen in the soil.
• Answer: Rhizobium
• Explanation: Rhizobium bacteria live in the root nodules of leguminous plants and convert atmospheric nitrogen into a usable form.
5. Question: In which type of plants does Rhizobium bacteria live?
• Answer: Leguminous
• Explanation: Rhizobium bacteria live in the root nodules of leguminous plants like peas, moong, and beans.
6. Question: What is the process of converting atmospheric nitrogen into usable nitrogen compounds called?
• Answer: Nitrogen fixation
• Explanation: Nitrogen fixation is the process of converting nitrogen gas from the air into a soluble form that plants can absorb.
7. Question: What type of relationship exists between leguminous plants and Rhizobium bacteria?
• Answer: Symbiotic
• Explanation: Rhizobium bacteria and leguminous plants live in a symbiotic relationship where both benefit from each other.
8. Question: Which nutrient is added to soil through nitrogen fixation?
• Answer: Nitrogen
• Explanation: Nitrogen fixation adds nitrogen to the soil, which is essential for plant growth.
9. Question: What structure is formed in the roots of leguminous plants due to Rhizobium bacteria?
• Answer: Nodules
• Explanation: Rhizobium bacteria live in root nodules of leguminous plants where nitrogen fixation takes place.
10. Question: What do farmers grow to naturally increase nitrogen content in the soil?
• Answer: Pulses
• Explanation: Pulses like gram, moong, and beans are leguminous plants that help in replenishing nitrogen in the soil.
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