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CBSE

Class 11 Important Question

Biology

CBSE Important Questions for Class 11 Biology - 2025-26

Q: 1. How many chapters are there in the CBSE Class 11 Biology syllabus for the 2025-26 session?

As per the rationalised NCERT curriculum for the 2025-26 academic year, the CBSE Class 11 Biology syllabus comprises 19 chapters. These are organised into five major units, starting from 'Diversity in the Living World' to 'Human Physiology'.

Q: 8. Is it more important to focus on questions from Plant Physiology or Human Physiology?

Both units are critical, but Human Physiology generally has a higher weightage in the Class 11 final exams. However, questions from Plant Physiology are often conceptually complex and are essential for scoring well. A balanced approach is best, but if time is limited, ensure you have mastered Human Physiology thoroughly.

Class 11 Biology Extra Questions and Answers Free PDF Download

CBSE Class 11 Biology Important Questions are essential tools for students aiming to improve in their exams. This resource offers a well-organised collection of important questions that cover crucial topics from the CBSE Class 11 Biology Syllabus, helping students focus their studies effectively. By engaging with these important questions, students can reinforce their understanding of core concepts and prepare more thoroughly for their exams.

Table of Content

Practising these questions not only increases confidence but also enhances problem-solving skills, making it easier to tackle exam challenges. Whether you need to review specific topics or engage in comprehensive study sessions, these important questions serve as a valuable guide. With the right preparation, students can achieve better results in their Biology exams.

10 Most Important Questions from Class 11 Biology Chapters

1. What are the main characteristics that define living organisms, and how do they differentiate from non-living things?

Answer: Living organisms exhibit several key characteristics, including:

Metabolism: All living things undergo chemical processes that provide energy for growth and maintenance.
Growth and Development: Organisms grow and develop according to specific genetic instructions.
Reproduction: Living beings have the ability to reproduce, either sexually or asexually, to produce offspring.
Response to Stimuli: They respond to environmental changes through various mechanisms, ensuring survival.
Homeostasis: Living organisms maintain a stable internal environment despite external changes. These characteristics distinguish living organisms from non-living things, which do not exhibit these complex biological functions.

2. Explain the five major kingdoms of life and provide examples of organisms in each kingdom.

Answer: The five major kingdoms of life are:

Monera: This kingdom includes unicellular organisms without a nucleus, such as bacteria and cyanobacteria.
Protista: Comprising mostly unicellular eukaryotic organisms, examples include amoeba and paramecium.
Fungi: This kingdom consists of multicellular and unicellular organisms that absorb nutrients from organic matter, such as mushrooms and yeast.
Plantae: Comprising multicellular organisms that perform photosynthesis, examples include flowering plants and ferns.
Animalia: This kingdom includes multicellular organisms that are heterotrophic, such as mammals, birds, and insects.

3. Describe the main differences between monocots and dicots in the Plant Kingdom.

Answer:

Monocots and dicots are two major groups of flowering plants with distinct features:

Monocots: They have one cotyledon, parallel leaf venation, scattered vascular bundles, and flower parts typically in multiples of three. Examples include grasses and lilies.
Dicots: They possess two cotyledons, net-like leaf venation, vascular bundles arranged in a circle, and flower parts typically in multiples of four or five. Examples include roses and sunflowers.

4. What is the morphology of flowering plants, and what are the key parts of a flower?

Answer: The morphology of flowering plants refers to their structural features. Key parts of a flower include:

Sepals: These protect the flower bud before it opens.
Petals: Often colourful, petals attract pollinators.
Stamens: The male reproductive part, consisting of the anther (produces pollen) and filament.
Carpels: The female reproductive part, made up of the stigma (receives pollen), style, and ovary (contains ovules). These parts work together for reproduction and pollination.

5. Discuss the process of photosynthesis in higher plants, including the light-dependent and light-independent reactions.

Answer: Photosynthesis occurs in two main stages:

Light-dependent Reactions: These take place in the thylakoid membranes of chloroplasts, where sunlight is absorbed by chlorophyll, leading to the splitting of water molecules (photolysis) and the production of ATP and NADPH.
Light-independent Reactions (Calvin Cycle): Occurring in the stroma of chloroplasts, ATP and NADPH from the light-dependent reactions are used to convert carbon dioxide into glucose. This process produces energy-rich compounds that sustain plant growth.

6. What are the main components of the cell and their functions?

Answer: Cells have several key components, including:

Nucleus: Contains genetic material (DNA) and controls cellular activities.
Mitochondria: Known as the powerhouse of the cell, they produce ATP through respiration.
Ribosomes: Sites of protein synthesis, translating RNA into proteins.
Cell Membrane: A selective barrier that regulates the entry and exit of substances.
Endoplasmic Reticulum (ER): Rough ER is involved in protein synthesis, while smooth ER is involved in lipid synthesis and detoxification.

7. Explain the stages of the cell cycle and the significance of cell division.

Answer: The cell cycle consists of several stages:

Interphase: The cell grows and prepares for division, with phases including G1 (growth), S (DNA synthesis), and G2 (preparation for mitosis).
Mitotic Phase: Includes mitosis (division of the nucleus) and cytokinesis (division of the cytoplasm). Cell division is significant for growth, tissue repair, and reproduction. It ensures that each daughter cell receives an identical set of chromosomes, maintaining genetic continuity.

8. What are the mechanisms of breathing and gas exchange in plants and animals?

Plants: Breathing occurs through small openings called stomata, where carbon dioxide enters and oxygen exits. Gas exchange in plants mainly happens during photosynthesis and respiration.

Animals: Breathing involves inhalation and exhalation, facilitated by respiratory organs like lungs or gills. In animals, oxygen is absorbed into the blood, and carbon dioxide is expelled, often through structures like alveoli in the lungs or gill filaments in fish.

9. Discuss the role of body fluids in circulation and the functions of the circulatory system in humans.

Answer: Body fluids, primarily blood, play a crucial role in circulation. The circulatory system consists of:

Heart: Pumps blood throughout the body.
Blood Vessels: Arteries carry oxygenated blood away from the heart, while veins return deoxygenated blood.
Functions: The circulatory system transports oxygen, nutrients, hormones, and waste products. It also helps regulate temperature and pH levels, ensuring homeostasis.

10. Describe the neural control and coordination in animals, focusing on the structure and function of neurons.

Answer: Neural control and coordination involve the nervous system, which consists of the brain, spinal cord, and nerves. Neurons are the fundamental units of the nervous system and consist of:

Dendrites: Receive signals from other neurons.
Cell Body: Contains the nucleus and integrates incoming signals.
Axon: Transmits electrical impulses away from the cell body to other neurons or muscles. The coordinated activity of neurons enables quick responses to stimuli, maintaining homeostasis and facilitating movement and behaviour in animals.

Here, you will find 10 overall important questions for Class 11 Biology. For a more detailed understanding and chapter-wise important questions, please click on the link above to access the complete resource. This will help you understand key concepts and prepare effectively for your exams.

How do Biology Important Questions Class 11 Help you with Exams?

Biology important questions help students focus on key topics that are likely to appear in exams. This targeted approach makes studying more effective.
Practicing these questions boosts confidence as students become familiar with the types of questions they may encounter. It also improves their understanding of core concepts.
Reviewing important questions allows for quick revisions, ensuring that students can easily recall essential information before exams.
These questions guide students in organising their study materials, making it easier to cover all necessary topics systematically.
Engaging with important questions enhances problem-solving skills, as students learn to apply concepts to different scenarios relevant to the subject.

Vedantu's Class 11 Biology Important Questions are a valuable resource for students preparing for their exams. By focusing on key topics and concepts, these questions help understanding and build confidence. Practicing these important questions not only aids in effective revision but also enhances problem-solving skills. Students are encouraged to make the most of this resource to achieve better results and deepen their knowledge of biology.

CBSE Class 11 Biology Chapter-wise Important Questions

CBSE Class 11 Biology Chapter-wise Important Questions and Answers cover topics from all 19 chapters, helping students prepare thoroughly by focusing on key topics for easier revision.

S. No	Chapter-wise Important Questions for Class 11 Biology
1	Chapter 1 - The Living World Important Question
2	Chapter 2 - Biological Classification Important Question
3	Chapter 3 - Plant Kingdom Important Question
4	Chapter 4 - Animal Kingdom Important Question
5	Chapter 5 - Morphology of Flowering Plants Important Question
6	Chapter 6 - Anatomy of Flowering Plants Important Question
7	Chapter 7 - Structural Organisation in Animals Important Question
8	Chapter 8 - Cell The Unit of Life Important Question
9	Chapter 9 - Biomolecules Important Question
10	Chapter 10 - Cell Cycle and Cell Division Important Question
11	Chapter 11 - Photosynthesis in Higher Plants Important Question
12	Chapter 12 - Respiration in Plants Important Question
13	Chapter 13 - Plant Growth and Development Important Question
14	Chapter 14 - Breathing and Exchange of Gases Important Question
15	Chapter 15 - Body Fluids and Circulation Important Question
16	Chapter 16 - Excretory Products and their Elimination Important Question
17	Chapter 17 - Locomotion and Movement Important Question
18	Chapter 18 - Neural Control and Coordination Important Question
19	Chapter 19 - Chemical Coordination and Integration Important Question

Additional Study Materials for Class 11 Biology

S.No.	Study Materials for Class 11 Biology
1	CBSE Class 11 Biology NCERT Solutions
2	CBSE Class 11 Biology Important Questions
3	CBSE Class 11 Biology NCERT Book
4	CBSE Class 11 Biology NCERT Exemplar
5	CBSE Class 11 Biology Sample Paper
6	CBSE Class 11 Biology Revision Notes
7	CBSE Class 11 Biology Syllabus

FAQs on CBSE Important Questions for Class 11 Biology - 2025-26

1. How many chapters are there in the CBSE Class 11 Biology syllabus for the 2025-26 session?

As per the rationalised NCERT curriculum for the 2025-26 academic year, the CBSE Class 11 Biology syllabus comprises 19 chapters. These are organised into five major units, starting from 'Diversity in the Living World' to 'Human Physiology'.

2. What are the high-weightage units I should focus on from the Class 11 Biology important questions?

While all units are crucial, for scoring high marks in the final exams, students should give special emphasis to questions from these units:

Unit 3: Cell Structure and Function: This unit is fundamental and questions often test deep conceptual understanding.
Unit 4: Plant Physiology: Chapters like Photosynthesis and Respiration are perennial sources of important questions.
Unit 5: Human Physiology: This is the most extensive unit, typically carrying the highest marks weightage in exams.

3. How do these important questions for Class 11 Biology help beyond the NCERT textbook exercises?

These important questions go beyond standard textbook exercises by focusing on application, analysis, and evaluation. They include Higher Order Thinking Skills (HOTS) questions, previously asked questions, and expected questions based on CBSE exam trends, which provide a more comprehensive preparation for the final exam format.

4. Are diagram-based questions important for the Class 11 Biology final exam?

Yes, diagram-based questions are extremely important. Chapters in Plant Anatomy, Animal Tissues, and especially Human Physiology (like the nephron, human heart, or neuron) are frequent sources for 3-mark and 5-mark questions. These important questions include practice on drawing, labelling, and interpreting diagrams as per the CBSE pattern.

5. How should I use this collection of important questions for effective exam preparation?

For maximum benefit, first, complete the relevant chapter from your NCERT textbook. Then, try to answer these important questions without looking at the solutions. This will help you identify weak areas. Use them to practise writing answers in the correct format, focusing on including keywords and structuring points as required for the final exam.

6. Do I need to prepare for a board exam in Class 11 Biology for the year 2025?

No, Class 11 does not have a national-level board exam conducted by CBSE. The final examinations are conducted at the school level. However, the question paper pattern, syllabus, and evaluation criteria are strictly based on the guidelines issued by the CBSE for the 2025-26 session, making these important questions a vital tool for preparation.

7. How do these important questions address Higher Order Thinking Skills (HOTS)?

These questions are specifically curated to include a significant number of HOTS questions. Instead of direct recall, they require you to apply concepts to new scenarios, analyse biological processes, or justify a scientific statement. This prepares you for the trickier, application-based questions that often appear in the final exam.

8. Is it more important to focus on questions from Plant Physiology or Human Physiology?

Both units are critical, but Human Physiology generally has a higher weightage in the Class 11 final exams. However, questions from Plant Physiology are often conceptually complex and are essential for scoring well. A balanced approach is best, but if time is limited, ensure you have mastered Human Physiology thoroughly.

9. How can practicing these questions improve my answer-writing skills for the Biology exam?

Practising these questions helps you understand the 'command words' in a question (like 'differentiate', 'explain', 'justify') and structure your answers accordingly. You learn how to break down 5-mark questions into parts, where to add diagrams, and how to use precise biological terminology, thereby improving your overall score and presentation.

10. Are these CBSE Class 11 Biology important questions updated for the 2025-26 syllabus?

Yes, this set of important questions is fully aligned with the latest CBSE syllabus and guidelines for the academic year 2025-26. It accounts for the rationalised content and focuses on topics prescribed by the NCERT, ensuring your preparation is relevant and targeted.