NEET Biology: Ecosystem — MCQ Test 16

Q6. Which of the following statements about net primary productivity (NPP) is correct?

Q7. What is the role of leaching in decomposition?

Q8. What is the main source of energy for an ecosystem?

Q9. What is the role of fungi in the decomposition process?

Q10. Which trophic level do secondary consumers occupy in a food chain?

NEET Biology — Ecosystem

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Which of the following is a correct statement about the nitrogen cycle?

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About this NEET MCQ Test

This page provides a free online MCQ test for NEET Biology preparation, focusing specifically on the chapter Ecosystem. It contains 10 carefully selected multiple-choice questions (MCQs) designed to test your conceptual understanding and exam readiness.

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Key concepts covered in this specific test include Following, Statement, Nitrogen, Describes, Ecological, and Processes.

Taking these timed MCQ tests helps you simulate the real NEET exam environment. Detailed step-by-step explanations are provided for every question to help you learn from your mistakes and strengthen your fundamentals.

Preview of Questions in this Test

Q1. Which of the following is a correct statement about the nitrogen cycle?

  • A. Plants directly absorb nitrogen gas from the air
  • B. Denitrification converts nitrates into nitrogen gas
  • C. Nitrogen fixation releases nitrogen gas into the atmosphere
  • D. Animals directly fix atmospheric nitrogen

Q2. Which of the following best describes an ecological pyramid?

  • A. A diagram representing the number, biomass, or energy at each trophic level
  • B. A representation of nutrient cycling
  • C. A model showing the interdependence of organisms
  • D. A classification system for food webs

Q3. Which of the following processes is responsible for the formation of humus?

  • A. Leaching
  • B. Humification
  • C. Catabolism
  • D. Fragmentation

Q4. Which of the following statements is true about the second law of thermodynamics in an ecosystem?

  • A. Energy is fully transferred between trophic levels
  • B. Energy is destroyed during metabolic processes
  • C. Energy is lost as heat at each trophic level
  • D. Energy cycles repeatedly in an ecosystem

Q5. Which of the following is an incorrect statement about biological magnification?

  • A. Toxins accumulate at higher trophic levels
  • B. Top predators are the most affected
  • C. Toxins decrease in concentration as they move up the food chain
  • D. Human activities contribute to biological magnification

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