9 class FA 3 KEY 2025-26

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 Self Assessment Model Paper - 3 (2025-26)

Class : 9

Subject: Biological Science

No. of Questions: 20

Total Marks: 35

Duration: 1 hr. 15 min.

Section – A (15 × 1 = 15)

1. Which of the following methods help in developing high-yield crop varieties?
A) Hybridization
C) Using manures
B) Selection of local varieties
D) Crop rotation
Answer: A) Hybridization

2. Rajaiah and Raghavaiah cultivated the same crop under similar conditions, but Rajaiah got a higher yield. What might be the reason for Raghavaiah's lower yield?
A) Use of poor-quality seeds
B) Timely use of fertilizers
C) Efficient crop management
D) Timely weed control
Answer: A) Use of poor-quality seeds

3. Identify the rabi crops ?
A) Paddy & mustard
C) Soyabean & maize
B) Wheat & mustard
D) Wheat & cotton
Answer: B) Wheat & mustard

4. Which of the following statements explains the main advantage of using manures?
A) Manures contain fewer nutrients than fertilizers
B) Manures take longer to show results
C) Continuous use of manures reduces soil fertility
D) Manures give long-term benefits
Answer: D) Manures give long-term benefits

5. Which of the following methods is most effective for increasing ground-water levels?
A) River lift system
B) Canal system of irrigation
C) Water shed system
D) Irrigation from wells
Answer: C) Water shed system

6. Why do people prefer to buy organic food even though it is costly and hard to find?
A) They are imported from other countries
B) They are only grown in certain seasons
C) They are genetically modified
D) They are grown without chemicals
Answer: D) They are grown without chemicals

7. Ravi plans to grow maize and soya beans together. How can intercropping help?
A) Plants grow faster
B) Use different nutrients
C) Use same nutrients
D) Same fertilizer needed
Answer: B) Use different nutrients

8. What do you call the unwanted plants in the crop field?
A) Herbs
B) Crops
C) Weeds
D) Shrubs
Answer: C) Weeds

9. Which statement about crop variety improvement is correct?
A) Same quality for every crop
B) Short duration increases expenditure
C) Both biotic and abiotic factors affect yield
D) Avoid climate-suitable varieties
Answer: C) Both biotic and abiotic factors affect yield

10. Which abiotic component affects crop productivity?
A) Salinity
B) Disease
C) Air quality
D) Insects
Answer: A) Salinity

11. Who gave the correct statement about micro and macro nutrients?



A) Ravi
B) Meena
C) Kiran
D) Anita
Answer: D) Anita

12. Which macro nutrient is available in both air & water?
A) Hydrogen
B) Oxygen
C) Nitrogen
D) Carbon
Answer: B) Oxygen

13. Which method increases nitrogen richness in soil?
A) Green manuring
B) Composting
C) Crop rotation
D) Weed removal
Answer: A) Green manuring

14. Disadvantage of canal system of irrigation?
A) Even distribution
B) Washes away fertilizers
C) Suitable for all crops
D) Prevents soil erosion
Answer: B) Washes away fertilizers

15. Most sustainable method to prevent weed growth?
A) Intercropping and crop rotation
B) Disease-resistant varieties
C) Ploughing weeds
D) Herbicides
Answer: A) Intercropping and crop rotation

Section – B (2 × 2 = 4)

16. Suggest two methods to improve soil fertility.

  • Use organic manures / compost

  • Practice crop rotation / green manuring

17. Suggestions to manage drought conditions and expenditure

  • Use drip irrigation

  • Rainwater harvesting

  • Grow drought-resistant crops

  • Practice watershed management

Section – C (2 × 4 = 8)

18. Why is weed control essential in farming?

  • Weeds compete for nutrients, water and sunlight

  • Reduce crop yield

  • Spread pests and diseases

  • Early removal gives better harvest

19. How do crop rotation and intercropping maintain soil health?

  • Improve soil fertility

  • Prevent nutrient depletion

  • Reduce pests and diseases

  • Ensure better nutrient utilization

Section – D (1 × 8 = 8)

20. A) Factors for selecting improved crop variety

  • High yield

  • Disease resistance

  • Pest resistance

  • Drought resistance

  • Short duration

  • Good quality produce

  • Better response to fertilizers

  • Suitable for different climates

OR

20. B) Differences between Manures and Fertilizers

Manures    Fertilizers
Organic in nature        Chemical in nature
Improve soil structure        Do not improve soil structure
Provide long-term benefits        Give quick results
Low nutrient content        High nutrient content
Eco-friendly            May cause pollution