CBSE Important Questions for Class 11 Biology

Important Questions for class 11 Biology: Biology is a subject that, when thoroughly understood, can help students achieve excellent scores. It is often chosen by students who are genuinely interested in life sciences and wish to pursue research or a career in medical science. To master the advanced concepts in Class 12, it is crucial for students to build a strong foundation in Class 11 Biology first.

Keeping this in mind, we have brought a set of important questions for Class 11 Biology, carefully curated by our expert faculty after deep research. These questions are aligned with both exam level and competitive level standards. They include a thoughtful mix from NCERT books class 11 and other relevant reference materials. Each question is designed to give you a clear understanding of the topic and can only be solved with sincere practice.

For your convenience, Infinity Learn also provides Class 11 study materials like CBSE revision notes, NCERT Solutions, and much more on our website. Students can access and practice these materials anytime to boost their preparation.

CBSE Important Questions for Class 11 Biology – Introduction

We have carefully created a complete set of CBSE Important Questions for Class 11 Biology, covering every chapter from the NCERT syllabus. These questions are designed by experts to help you in exam preparation and also to understand each concept clearly. 

Whether it's Plant Physiology, Human Physiology, or Cell Structure, our question series will guide you step by step in learning. Practicing these questions will boost your confidence and help you score better in both school exams and competitive exams. This collection is a smart and effective way to revise your syllabus and strengthen your Class 11 Biology basics.

Also Check: NCERT Solutions for Class 11 Biology | GK Questions for Class 11 Biology

CBSE Class 11 Biology – Chapter wise Marks Distribution

CBSE Class 11 Biology Marks Distribution

Important Questions from CBSE Class 11 Biology Chapters

Before you begin solving these important questions from Class 11 Biology, make sure you have cleared all your basic concepts from each chapter. These questions are specially designed for self-assessment and should be practiced only when you are ready to test your understanding. They are perfect for CBSE exam preparation and will help you identify your strengths and the areas that need more focus.

1. Which of the following features distinguishes Monera from Protista?
   A. Presence of peptidoglycan in cell wall
   B. Mode of nutrition
   C. Presence of nucleus
   D. Locomotory organelles
   Answer: A
2. Which organism is correctly matched with its kingdom and characteristic feature?
   A. Euglena – Plantae – Autotrophic
   B. Paramecium – Protista – Cilia for locomotion
   C. Mycoplasma – Fungi – Cell wall without cellulose
   D. Spirogyra – Monera – No nucleus
   Answer: B
3. Which of the following criteria is not used in Whittaker’s five-kingdom classification?
   A. Body organization
   B. Mode of nutrition
   C. Phylogenetic relationship
   D. Cell wall composition
   Answer: D
4. Which epithelial tissue lines the inner surface of blood vessels and facilitates diffusion?
   A. Columnar epithelium
   B. Cuboidal epithelium
   C. Squamous epithelium
   D. Ciliated epithelium
   Answer: C
5. Collenchyma in plants provides support and also:
   A. Performs photosynthesis
   B. Stores food
   C. Transports water
   D. Forms secondary xylem
   Answer: A
6. Which option accurately links each muscle type with its specific characteristics?
   A. Skeletal – Involuntary – Multinucleated
   B. Cardiac – Voluntary – Uninucleated
   C. Smooth – Involuntary – Spindle shaped
   D. Cardiac – Voluntary – Branched
   Answer: C
7. Which cellular component is found in prokaryotic cells but missing in eukaryotic cells?
   A. Ribosomes
   B. Plasmid
   C. Mitochondria
   D. Endoplasmic reticulum
   Answer: B
8. What role does the Golgi apparatus play in animal cells?
   A. Protein synthesis
   B. Lipid degradation
   C. Sorting and packaging of proteins
   D. DNA replication
   Answer: C
9. Fluid mosaic model explains:
   A. Semi-permeability of the nuclear membrane
   B. Arrangement of microtubules
   C. Dynamic nature of plasma membrane
   D. Function of lysosomes
   Answer: C
10. What is the process called when water is released in liquid form through hydathodes?
    A. Transpiration
    B. Guttation
    C. Evaporation
    D. Root pressure
    Answer: B
11. In C4 plants, the primary CO₂ acceptor is:
    A. RuBP
    B. PEP
    C. PGA
    D. OAA
    Answer: B
12. Under which of the following conditions do stomata remain closed?
    A. Light
    B. High internal CO₂
    C. Low CO₂ concentration in leaf
    D. Presence of K⁺ in guard cells
    Answer: B
13. Which plant hormone is primarily responsible for dormancy?
    A. Gibberellin
    B. Auxin
    C. Abscisic acid
    D. Cytokinin
    Answer: C
14. Which enzyme plays a key role in splitting water molecules during photosynthesis?
    A. Rubisco
    B. NADP⁺ reductase
    C. Oxygen evolving complex
    D. PEP carboxylase
    Answer: C
15. Which part of the nephron is responsible for maximum reabsorption?
    A. Loop of Henle
    B. Collecting duct
    C. Distal convoluted tubule
    D. Proximal convoluted tubule
    Answer: D
16. In resting membrane potential, the inside of the axon is:
    A. Positive due to Na⁺ influx
    B. Negative due to K⁺ leakage
    C. Positive due to Cl⁻ ions
    D. Neutral
    Answer: B
17. Which vitamin is essential for vision and also acts as an antioxidant?
    A. Vitamin A
    B. Vitamin B1
    C. Vitamin D
    D. Vitamin C
    Answer: A
18. What takes place in the heart during the systolic phase?
    A. Relaxation of ventricles
    B. Closing of semilunar valves
    C. Ejection of blood from ventricles
    D. Atrial filling
    Answer: C
19. Which component of blood is involved in immunity?
    A. Erythrocytes
    B. Platelets
    C. Plasma
    D. Lymphocytes
    Answer: D
20. Which of these enzymes is secreted in an inactive form?
    A. Pepsin
    B. Lipase
    C. Trypsinogen
    D. Amylase
    Answer: C

Also Check: Biology MCQ for Class 11 | CBSE Class 11 Biology Syllabus

Application-based and Higher Order Thinking

1. Why is My Plant Wilting Even Though the Soil is Moist? This could be due to:
   A. Excess transpiration
   B. Blockage in xylem
   C. Less chlorophyll
   D. Absence of phloem
   Answer: B
2. What Happens When a Cell is Immersed in a Hypertonic Solution?
   A. Gain water
   B. Swell
   C. Remain same
   D. Lose water and shrink
   Answer: D
3. How is the Attachment of Myosin Heads to Actin Controlled During Muscle Contraction?
   A. Troponin and calcium ions
   B. ATP and myosin
   C. Acetylcholine
   D. Tropomyosin and ATP
   Answer: A
4. Which part of the brain controls body temperature and tells us when we're hungry?
   A. Cerebrum
   B. Cerebellum
   C. Medulla
   D. Hypothalamus
   Answer: D
5. Which disease happens when the brain doesn't make enough dopamine?
   A. Parkinson’s disease
   B. Alzheimer’s disease
   C. Epilepsy
   D. Meningitis
   Answer: A
6. What will happen to a plant if you cover the tiny holes on its leaves with petroleum jelly?
   A. Grow faster
   B. Photosynthesize more
   C. Lose more water
   D. Show reduced transpiration
   Answer: D
7. In CAM plants, CO₂ is fixed at:
   A. Day time in bundle sheath
   B. Night in mesophyll as malate
   C. Day time in mesophyll as OAA
   D. Night in bundle sheath as malate
   Answer: B
8. A DNA molecule has 20% thymine. What is the percentage of cytosine?
   A. 20%
   B. 30%
   C. 40%
   D. 60%
   Answer: B
9. Which hormone increases the reabsorption of Na⁺ in kidney tubules?
   A. ADH
   B. Aldosterone
   C. Oxytocin
   D. Glucagon
   Answer: B
10. Which pair of biological terms is correctly matched together?
    A. Liver – Urea formation
    B. Pancreas – Bile secretion
    C. Kidney – Insulin production
    D. Lungs – Urea excretion
    Answer: A

Also Check: NCERT Exemplar Solutions Class 11 Biology

Experimental/Analytical Based

1. What type of cell would a student be looking at if it doesn't have a membrane around its nucleus?
   A. From an alga
   B. Prokaryotic
   C. Eukaryotic
   D. Fungal
   Answer: B
2. During which phase of cell division do chromosomes line up in the middle of the cell?
   A. Prophase
   B. Anaphase
   C. Metaphase
   D. Telophase
   Answer: C
3. Which indicator organism is used to assess water quality for microbial contamination?
   A. Salmonella
   B. Pseudomonas
   C. Escherichia coli
   D. Vibrio cholerae
   Answer: C
4. Which hormone is chemically a polypeptide?
   A. Testosterone
   B. Thyroxine
   C. Insulin
   D. Estrogen
   Answer: C
5. Which among the following organelles is semi-autonomous and involved in ATP synthesis?
   A. Golgi body
   B. Ribosome
   C. Mitochondria
   D. Lysosome
   Answer: C
6. If there is a defect in tricuspid valve, the backflow of blood would occur in:
   A. Right ventricle to right atrium
   B. Right atrium to left atrium
   C. Pulmonary vein to right atrium
   D. Left ventricle to right atrium
   Answer: A
7. Which of the following plant movements is independent of the direction of stimulus?
   A. Phototropism
   B. Geotropism
   C. Hydrotropism
   D. Nastic movement
   Answer: D
8. Which organelle is involved in protein glycosylation and secretion?
   A. Mitochondria
   B. Lysosome
   C. Golgi apparatus
   D. Ribosome
   Answer: C
9. Which process in respiration yields the highest ATP per glucose molecule?
   A. Glycolysis
   B. Krebs cycle
   C. Fermentation
   D. Electron transport chain
   Answer: D
10. Which structure initiates and maintains the contraction of the heart?
    A. Purkinje fibres
    B. SA node
    C. AV node
    D. Bundle of His
    Answer: B