Consider the following statements about small-scale technologies for rice straw management:

1. Composting turns rice straw into organic manure to enrich soil.
   
2. Mushroom farming with rice straw provides supplementary income.
   
3. Mixing rice straw into soil improves its ability to retain water.
   

How many of the above statements is/are correct?

Consider the following statements regarding biofuels from rice straw:

1. They reduce dependence on fossil fuels by tapping renewable sources.
   
2. Bioethanol and biogas can be extracted from rice straw.
   
3. Their production process results in zero greenhouse gas emissions.
   

How many of the above statements is/are correct?

 What is a key feature of Recirculating Aquaculture Systems (RAS)?

Consider the following statements about the core and buffer zones of tiger reserves:

1. Buffer zones help reduce interaction between humans and tigers.
   
2. Core areas allow regulated tourism to boost revenue.
   
3. The core zone is designated as the critical habitat with maximum protection.
   

How many of the above statements is/are incorrect?

Consider the following statements regarding Article 293 of the Indian Constitution:

1. The union government can set conditions for lending to states.
   
2. A state requires Union approval before borrowing from foreign sources.
   
3. States are permitted to raise loans within India against their Consolidated Fund.
   

How many of the above statements is/are correct?