Fill in each blank with the correct word from the lesson.

1. Special bacteria called _______ live in nodules on the roots of legume plants like peas and beans.
2. Farmers add fertilisers to replenish soil _______.
3. Nitrogen is the most critical soil nutrient — plants need it to make proteins and _______.
4. Every time a crop is harvested, it takes _______, phosphorus, potassium, and other minerals out of the soil.
5. Chemical fertilisers like urea, DAP, and NPK _______s deliver concentrated nutrients quickly, boosting crop yields dramatically.

Choose the best option for each question.

1. Which bacteria convert atmospheric nitrogen into nitrates usable by plants?
   a) E. colib) Rhizobiumc) Salmonellad) Yeast
2. What is the main problem with overusing chemical fertilisers?
   a) They work too slowlyb) They deplete soil health and pollute waterc) Plants cannot absorb themd) They are too expensive
3. Why can't plants use nitrogen directly from the air?
   a) Air nitrogen is toxic to plantsb) Plants cannot absorb gasesc) They can only absorb nitrates from soild) Nitrogen gas is too heavy

Write T for True or F for False in the brackets.

1. Special bacteria called Rhizobium live in nodules on the roots of legume plants like peas and beans.
2. Special bacteria called E. coli live in nodules on the roots of legume plants like peas and beans.
3. They deplete soil health and pollute water is one of the key concepts in the lesson on Replenishing Soil Nutrients.
4. They work too slowly is the main topic of this lesson.

1. In your own words, explain what Replenishing Soil Nutrients means.
2. List two things you learned from this lesson on Replenishing Soil Nutrients.