Previous Year Papers NEET Biology Class 11 – Respiration in Plants

Respiration in Plants is a vital chapter of NEET Biology Class 11 that explains how plants release energy from carbohydrates to perform vital activities. Understanding this chapter is crucial for answering conceptual and application-based questions in NEET.

NEET previous year papers often include questions on stages of respiration, ATP yield, enzymes involved, and comparison of aerobic and anaerobic respiration. Practicing PYQs helps students master energy flow, biochemical reactions, and associated diagrams. Studentbro.in provides exam-oriented content to ensure effective preparation.

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Introduction to Respiration – NEET PYQ Focus

Respiration is the process of breaking down organic compounds to release energy in the form of ATP. It occurs in all living cells and provides energy for growth, maintenance, and metabolic activities.

NEET questions often test the definition, significance, and overall equation of respiration.

Glycolysis – Important NEET Concepts

Glycolysis is the first step of respiration and occurs in the cytoplasm. Glucose is broken down into pyruvate with a net gain of 2 ATP and 2 NADH molecules.

Key concepts for NEET include energy investment and energy payoff phases, substrate-level phosphorylation, and enzymes like hexokinase and phosphofructokinase.

Krebs Cycle (Citric Acid Cycle) – Frequently Asked Questions

The Krebs cycle occurs in the mitochondrial matrix and is central to aerobic respiration. Pyruvate is converted into acetyl-CoA, which enters the cycle to produce NADH, FADH2, ATP, and CO2.

NEET questions often focus on intermediates, enzymes, and ATP yield from one cycle. Understanding the cyclic nature and significance of the Krebs cycle is essential.

Electron Transport Chain and Oxidative Phosphorylation

The electron transport chain is located in the inner mitochondrial membrane. NADH and FADH2 donate electrons to the chain, creating a proton gradient that drives ATP synthesis.

Chemiosmosis and oxidative phosphorylation produce the majority of ATP in aerobic respiration. NEET PYQs often include identification of components and the ATP yield of the ETC.

Anaerobic Respiration (Fermentation)

Anaerobic respiration occurs in the absence of oxygen and results in partial breakdown of glucose. Products include ethanol and CO2 in plants and lactic acid in some tissues.

NEET questions frequently ask differences between aerobic and anaerobic respiration, products, and ATP yield.

Glyoxylate Cycle – Concept-Based Questions

The glyoxylate cycle is a modified Krebs cycle that occurs in germinating seeds to convert stored fats into carbohydrates. Key enzymes include isocitrate lyase and malate synthase.

This topic occasionally appears in NEET previous year papers in the context of metabolism in plants.

Factors Affecting Respiration

Respiration in plants is influenced by oxygen concentration, temperature, and availability of substrates. Limiting factors and their effects are important from an NEET perspective.

NEET PYQs often test conceptual understanding of how environmental factors affect respiration rate.

Importance of Previous Year Papers for NEET Biology

Practicing previous year papers helps students identify frequently asked topics, strengthen conceptual understanding, and improve speed and accuracy. PYQs for Respiration in Plants focus on pathways, ATP yield, enzyme functions, and differences between aerobic and anaerobic respiration.

Conclusion

Previous Year Papers of NEET Biology Class 11 Respiration in Plants are essential for mastering plant physiology. This chapter requires clear understanding of glycolysis, Krebs cycle, electron transport chain, and anaerobic pathways.

Regular practice of PYQs helps students enhance conceptual clarity, diagram interpretation, and confidence in NEET. Studentbro.in provides structured, reliable, and exam-focused content to help NEET aspirants succeed.