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CBSE Important Questions for Class 11 Biology – Introduction
CBSE Class 11 Biology – Chapter wise Marks Distribution
Important Questions from CBSE Class 11 Biology Chapters
- Application-based and Higher Order Thinking
- Experimental/Analytical Based
CBSE Most Important Questions for class 11 Biology
CBSE Important Questions for class 11 Biology FAQs

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CBSE Important Questions for Class 11 Biology

By Maitree Choube

Updated on 21 May 2025, 12:25 IST

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.

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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.

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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

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CBSE Class 11 Biology – Chapter wise Marks Distribution

Unit	Chapters Included	Term	Marks
I. Diversity of Living Organisms	Chapter 1: The Living World Chapter 2: Biological Classification Chapter 3: Plant Kingdom Chapter 4: Animal Kingdom	Term I	15
II. Structural Organisation in Animals and Plants	Chapter 5: Morphology of Flowering Plants Chapter 7: Structural Organisation in Animals	Term I	8
III. Cell: Structure and Function	Chapter 8: Cell – The Unit of Life Chapter 9: Biomolecules	Term I	12
III. Cell: Structure and Function (Contd.)	Chapter 10: Cell Cycle and Cell Division	Term II	5
IV. Plant Physiology	Chapter 13: Photosynthesis in Higher Plants Chapter 14: Respiration in Plants Chapter 15: Plant Growth and Development	Term II	12
V. Human Physiology	Chapter 17: Breathing and Exchange of Gases Chapter 18: Body Fluids and Circulation Chapter 19: Excretory Products and Their Elimination Chapter 20: Locomotion and Movement Chapter 21: Neural Control and Coordination Chapter 22: Chemical Coordination and Integration	Term II	18

CBSE Class 11 Biology Marks Distribution

Component	Marks
Theory (Term I + II)	70
Practical – Term I	15
Practical – Term II	15
Grand Total	100

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.

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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
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
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
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
Collenchyma in plants provides support and also:
A. Performs photosynthesis
B. Stores food
C. Transports water
D. Forms secondary xylem
Answer: A
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
Which structure is present in prokaryotic cells but absent in eukaryotic cells?
A. Ribosomes
B. Plasmid
C. Mitochondria
D. Endoplasmic reticulum
Answer: B
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
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
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
In C4 plants, the primary CO₂ acceptor is:
A. RuBP
B. PEP
C. PGA
D. OAA
Answer: B
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
Which plant hormone is primarily responsible for dormancy?
A. Gibberellin
B. Auxin
C. Abscisic acid
D. Cytokinin
Answer: C
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
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
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
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
What happens in the heart during the systole phase?"
A. Relaxation of ventricles
B. Closing of semilunar valves
C. Ejection of blood from ventricles
D. Atrial filling
Answer: C
Which component of blood is involved in immunity?
A. Erythrocytes
B. Platelets
C. Plasma
D. Lymphocytes
Answer: D
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

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
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
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
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
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
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
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
A DNA molecule has 20% thymine. What is the percentage of cytosine?
A. 20%
B. 30%
C. 40%
D. 60%
Answer: B
Which hormone increases the reabsorption of Na⁺ in kidney tubules?
A. ADH
B. Aldosterone
C. Oxytocin
D. Glucagon
Answer: B
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

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Experimental/Analytical Based

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
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
Which indicator organism is used to assess water quality for microbial contamination?
A. Salmonella
B. Pseudomonas
C. Escherichia coli
D. Vibrio cholerae
Answer: C
Which hormone is chemically a polypeptide?
A. Testosterone
B. Thyroxine
C. Insulin
D. Estrogen
Answer: C
Which among the following organelles is semi-autonomous and involved in ATP synthesis?
A. Golgi body
B. Ribosome
C. Mitochondria
D. Lysosome
Answer: C
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
Which of the following plant movements is independent of the direction of stimulus?
A. Phototropism
B. Geotropism
C. Hydrotropism
D. Nastic movement
Answer: D
Which organelle is involved in protein glycosylation and secretion?
A. Mitochondria
B. Lysosome
C. Golgi apparatus
D. Ribosome
Answer: C
Which process in respiration yields the highest ATP per glucose molecule?
A. Glycolysis
B. Krebs cycle
C. Fermentation
D. Electron transport chain
Answer: D
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

CBSE Most Important Questions for class 11 Biology

Here are 10 most important questions from Class 11 Biology, designed to be high-yield, concept-based, and suitable for board and NEET-level preparation. Must Practice these Questions before going for an Exam.

Explain the human digestive system with a labeled diagram and describe the role of digestive enzymes in each part.
How are saturated fats, unsaturated fats, and phospholipids different from each other? Give examples and explain why each is important in living things.
Describe the process of photosynthesis in higher plants, highlighting the role of pigments, light reactions, and the Calvin cycle.
Compare and contrast prokaryotic and eukaryotic cells with reference to cell envelope, organelles, and genetic material.
List and describe the five major kingdoms of life as per Whittaker’s classification, with examples for each.
Explain the structure and function of the human heart with a labeled diagram and describe the cardiac cycle.
Explain how water is absorbed and transported in plants, mentioning the roles of root pressure, cohesion-tension, and transpiration pull.
Describe the structure and function of a nephron and explain how urine formation occurs in three steps.
Discuss the mechanism of breathing in humans and explain how gases are exchanged in alveoli.
Explain the fluid mosaic model of the plasma membrane and discuss the role of membrane proteins in transport.

CBSE Important Questions for class 11 Biology FAQs

What are the most important topics in Biology Class 11?

The most important topics in Class 11 Biology include cell structure and function, plant physiology (especially photosynthesis and transport in plants), human physiology, and biological classification. These concepts form the base for Class 12 and NEET preparation.

Which is the most difficult chapter in Class 11 Biology?

Plant physiology is often considered the most difficult due to its detailed processes like photosynthesis, respiration, and mineral nutrition. However, with proper flowcharts and diagrams, it becomes easier to understand.

How to get full marks in CBSE Biology Class 11 Exam?

To score full marks in Biology Class 11, focus on NCERT textbook thoroughly, revise diagrams, write answers in proper format, practice labelled diagrams, and solve previous years’ questions. Consistent revision and conceptual clarity are key.

Which is the toughest subject in CBSE Class 11 ?

The hardest subject varies by student, but many find Physics tough due to its numerical and application-based problems. However, Biology can also be challenging if concepts and terms are not understood clearly.

Is Biology hard in Class 11 CBSE?

Class 11 Biology is not hard if studied regularly. It is theory-heavy, but with interest in life sciences, clear understanding of concepts, and consistent revision, it becomes one of the most scoring subjects.

What is the importance of Biology for Class 11?

Biology in Class 11 builds the foundation for careers in medicine, biotechnology, genetics, agriculture, and more. It helps students understand how living organisms function at the cellular and system level, forming the core for Class 12 and competitive exams.