Plant Physiology is a crucial yet often underestimated unit in NEET Biology. Many students find it slightly conceptual, but with proper understanding and NCERT-focused preparation, it becomes a highly scoring section. Questions are frequently asked from photosynthesis, respiration, plant growth regulators, and transport in plants. In this article on Top 5 Plant Physiology Questions for NEET, we will cover the most important previous year questions (PYQs) along with clear concepts and explanations to help you master this unit.
Why Practice Top 5 Plant Physiology Questions for NEET?
Plant Physiology contributes around 8–10 questions in NEET. Most of these questions are either concept-based or directly derived from NCERT statements and diagrams. Practicing the Top 5 Plant Physiology Questions for NEET helps you understand recurring patterns such as enzyme functions, growth hormones, and physiological processes like transpiration and photosynthesis.
Another advantage is that many questions are predictable if you have a strong grip on NCERT diagrams and definitions.
Question 1: Photosynthesis – Site of Light Reaction
Question:
The light reaction of photosynthesis takes place in:
Options:
A. Stroma
B. Thylakoid membrane
C. Cytoplasm
D. Outer membrane of chloroplast
Correct Answer: B. Thylakoid membrane
Explanation:
The light reactions occur in the thylakoid membranes of chloroplasts, where pigments like chlorophyll absorb light energy. This leads to the formation of ATP and NADPH. The stroma, on the other hand, is the site of the dark reaction (Calvin cycle). This is a direct NCERT concept and is frequently asked in the Top 5 Plant Physiology Questions for NEET.
Question 2: Transpiration Pull
Question:
Water movement in plants occurs mainly due to:
Options:
A. Root pressure
B. Capillary action
C. Transpiration pull
D. Osmosis
Correct Answer: C. Transpiration pull
Explanation:
The cohesion-tension theory explains that transpiration pull is the primary force responsible for the upward movement of water in plants. Water evaporates from leaves, creating a negative pressure that pulls water upward through xylem. Questions like this are very common in the Top 5 Plant Physiology Questions for NEET, especially from transport in plants.
Question 3: Respiration – Respiratory Quotient (RQ)
Question:
The respiratory quotient (RQ) for carbohydrates is:
Options:
A. 0.7
B. 1
C. 1.3
D. 0.5
Correct Answer: B. 1
Explanation:
RQ is defined as the ratio of CO₂ evolved to O₂ consumed. For carbohydrates, this ratio is 1 because equal amounts of CO₂ are produced and O₂ is consumed. This is a commonly repeated numerical concept in the Top 5 Plant Physiology Questions for NEET.
Question 4: Plant Growth Regulators
Question:
Which plant hormone is responsible for cell elongation?
Options:
A. Cytokinin
B. Gibberellin
C. Auxin
D. Abscisic acid
Correct Answer: C. Auxin
Explanation:
Auxins promote cell elongation, especially in stems. They play a key role in phototropism and apical dominance. Although gibberellins also promote growth, auxins are primarily responsible for elongation. Questions on plant hormones are very frequently included in the Top 5 Plant Physiology Questions for NEET.
Question 5: Photorespiration
Question:
Photorespiration occurs in:
Options:
A. Only chloroplast
B. Only mitochondria
C. Chloroplast, peroxisome, and mitochondria
D. Cytoplasm only
Correct Answer: C. Chloroplast, peroxisome, and mitochondria
Explanation:
Photorespiration is a process involving three organelles: chloroplast, peroxisome, and mitochondria. It occurs when oxygen is used instead of carbon dioxide by RuBisCO, leading to energy loss. This is a very important concept in the Top 5 Plant Physiology Questions for NEET, often tested directly from NCERT.
Key Concepts Covered in Top 5 Plant Physiology Questions for NEET
The Top 5 Plant Physiology Questions for NEET highlight the most important topics such as photosynthesis, transpiration, respiration, plant hormones, and photorespiration. These concepts are repeatedly asked because they form the foundation of plant functioning.
Understanding processes like light reaction and Calvin cycle, water transport mechanisms, and hormone functions is essential. Diagrams from NCERT, especially of chloroplast structure and transport pathways, are extremely important and should be revised regularly.
Common Mistakes Students Make
While preparing the Top 5 Plant Physiology Questions for NEET, students often confuse the sites of different processes, such as light and dark reactions. Another common mistake is mixing up functions of plant hormones like auxin and gibberellin.
Students also tend to ignore numerical concepts like RQ, which can easily fetch marks if practiced properly. Careful reading of NCERT and repeated revision can help avoid these errors.
Preparation Strategy for Plant Physiology
To master the Top 5 Plant Physiology Questions for NEET, focus on understanding rather than memorizing. Start with NCERT and ensure clarity of each process. Revise diagrams thoroughly, as many questions are based on them.
Practice PYQs regularly and make short notes for quick revision of formulas, hormone functions, and key definitions. With consistent revision, this unit can become highly scoring.
FAQs on Top 5 Plant Physiology Questions for NEET
Q1. How many questions come from Plant Physiology in NEET?
Around 8–10 questions are asked.
Q2. Is Plant Physiology difficult for NEET?
It can feel conceptual, but with NCERT-based preparation, it becomes manageable.
Q3. Which topics are most important in Plant Physiology?
Photosynthesis, respiration, transport, and plant hormones are key areas.
Q4. How should I revise Plant Physiology quickly?
Focus on diagrams, key processes, and PYQs like the Top 5 Plant Physiology Questions for NEET.