SET 3
Introduction: This set
contains 50 multiple-choice questions focusing on energy flow in ecosystems,
the 10% law, biological magnification, pesticide accumulation, and the impact
of human activities on the environment. These questions are designed to strengthen
understanding of critical ecological concepts for Class 10 students.
⏳ Time Left: 20:00
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📘 SCIENCE
BIOLOGY | Our Environment-C
📝 Questions: 50
⏱️ Timer: 20 min
Q1. Pesticides enter soil mainly due to:
Q2. Energy flow in ecosystems cannot be reversed because:
Q3. Aquatic plants take pesticides from:
Q4. The greatest number of individuals in an ecosystem is at the level of:
Q5. Energy once passed to herbivores:
Q6. A food web consists of:
Q7. Decomposers get energy from:
Q8. The branching pattern of feeding relationships forms:
Q9. Food webs show that organisms:
Q10. Pesticides can enter the human body through:
Q11. Flow of energy in an ecosystem is:
Q12. Non-degradable chemicals accumulate at each trophic level due to:
Q13. Energy transfer efficiency in ecosystems is:
Q14. From soil, pesticides enter plants through:
Q15. Human beings are most affected by pesticide accumulation because:
Q16. Pesticides enter the food chain mainly through:
Q17. Green plants capture about how much solar energy in a terrestrial ecosystem?
Q18. Energy is lost during digestion mainly as:
Q19. Food chains usually have only 3–4 steps because:
Q20. The 10% law explains:
Q21. Human activities affect the environment because humans are:
Q22. Energy flows from autotrophs to:
Q23. Biological magnification refers to:
Q24. Which factor directly affects pesticide accumulation?
Q25. Which trophic level supports all others?
Q26. On average, how much energy is transferred from one trophic level to the next?
Q27. Why are bans placed on pesticide-rich food items?
Q28. The energy captured by green plants is converted into:
Q29. After four trophic levels, usable energy becomes:
Q30. Which process supports energy flow in ecosystems?
Q31. Only a part of energy is passed to the next trophic level because:
Q32. Which group captures solar energy first?
Q33. Energy flow diagrams help us understand:
Q34. During energy transformation in an ecosystem, some energy is always lost as:
Q35. Each organism in nature is usually eaten by:
Q36. The ultimate source of energy for ecosystems is:
Q37. When plants are eaten by primary consumers, most energy is lost as:
Q38. Chemicals like pesticides are dangerous because they are:
Q39. The energy available at higher trophic levels is:
Q40. Loss of energy at each trophic level limits:
Q41. Energy captured by autotrophs:
Q42. Which chemical property causes pesticides to magnify?
Q43. The length of food chains varies due to:
Q44. Food chains mainly show:
Q45. Lower trophic levels have:
Q46. Maximum concentration of pesticides is found in:
Q47. If energy were not lost at each step, food chains would be:
Q48. Washing food items removes pesticides:
Q49. Pesticide residues are found in:
Q50. Environmental changes affect humans mainly because:
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