CBSE Class 11 Biology Diagrams for Quick Revision, Download PDF

CBSE Class 11 Biology Important Diagrams: The study of biology is impossible without the use of flowcharts and diagrams. These illustrations make it easier for us to comprehend the complex ideas of living systems. Can someone who has never seen a human heart comprehend how it works? Not at all, correct? Diagrams are an essential component of biology because of this.

It is expected that students will be able to use flowcharts and diagrams to clearly illustrate the topics. A person who is well-versed in the subject may turn it into an example with ease. This raises the likelihood of a high score by demonstrating to the reader that the student has a firm grasp of the material.

CBSE Class 11th Biology Syllabus 2025-26: Unit-Wise Division

Check the unit-wise marking scheme here: 

Important Biology diagrams for CBSE Class 11 Half Yearly Exam 2025-26:

Below is the list of important Biology diagrams for Class 11. These illustrations will help CBSE Class 11 Biology students understand the concepts easily. Practice them for better grades in CBSE Class 11 Biology 2025-26 exam.

Fig: 1 Different Shapes of Cell Diagram

Different cell types, varying in size and form, comprise living things. The form of one unicellular creature is different from that of another. A multicellular organism is made up of different types of cells. Some are round, while others are oval; some are long, while others are short.

Fig: 2 Bacterial cell Diagram

Bacterial cells typically consist of a nucleoid area that contains DNA, cytoplasm, ribosomes, cell wall, and cell membrane. Additionally, certain bacteria may have pili, flagella, and a capsule.

Fig: 3 Flagella Diagram

The flagella is a helical structure composed of flagellin protein. The flagella structure is divided into three parts: Basal body; Hook; Filament. Basal Body.

Fig: 4 Plant and Animal Cell Diagram

Plant cells have a cell wall, chloroplasts, and a large central vacuole, which animal cells lack. Both plant and animal cells contain a nucleus and mitochondria.

Fig: 5 Cell Wall Diagram

Cell wall diagram, which shows the cell membrane surrounded by a stiff outer layer. Its main purpose is to shield the cell and give it structural support. The primary building block of this wall in plants is cellulose, which creates a sturdy structure. Moreover, this wall keeps the cell from rupturing from excessive water pressure and aids in maintaining its form.

Fig: 6 Cell Cycle Diagram

The progression of a cell's growth and division into two new daughter cells is illustrated by the cell cycle diagram. M Phase (Mitotic phase) and Interphase are its two primary phases. The prolonged, preparatory phase is called interphase, while the actual cell division happens during M Phase.

Fig: 7 Amitosis Diagram

Illustrate a single cell's direct division by displaying its cytoplasm and nucleus expanding and then contracting in the center to create two smaller daughter cells. The process is distinguished by the lack of intricate stages of mitosis, including spindle formation and chromosomal condensation.

Fig: 8 Amoeba Diagram

The tiny, unicellular organisms known as amoebae are members of the Amoebidae family. They are typically found in freshwater environments, such as pond and stream bottoms, where they frequently hide among decomposing plants. Amoebae are characterized by their capacity to change shape through cytoplasmic extensions known as pseudopodia. They are able to move and catch food particles because to their extensions.

Fig: 9 Fragmentation in Spirogyra Diagram

Spirogyra reproduce asexually through a process called fragmentation, in which a strong water stream causes the mature body to break into numerous smaller pieces. Later on, these disparate fragments will develop into new people.

Fig: 10 Parts of a Human Brain

A human brain diagram typically labels the three main divisions—Forebrain, Midbrain, and Hindbrain—along with the Cerebrum (part of the forebrain) and its four lobes: Frontal, Parietal, Temporal, and Occipital. Other key structures include the Cerebellum, Brainstem, and Spinal Cord

Fig: 11 Structure of Eye

The cornea, lens, iris, pupil, optic nerve, and other internal components are encased in the three coats (choroid, retina, and sclera) that make up the eye's structure. After entering through the cornea, light travels through the pupil, which is regulated by the iris, is focused onto the light-sensitive retina by the lens, and is then transmitted to the brain through the optic nerve, where it is converted into images.

Fig: 12 Human Respiratory System

The nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, lungs, and diaphragm should all be shown in a normal human respiratory system diagram. Since the lungs' alveoli are where gas exchange occurs, they should also be prominently labeled on the figure. It is also useful to include the heart located between the lungs and the pleural membranes around the lungs.

Fig: 13 Neuron and Nerves

A single neuron, the fundamental nerve cell, and a nerve—a bundle of axons from several neurons that resembles a cable delivering signals—are usually depicted in a diagram. The neuron diagram illustrates a cell body with dendrites receiving signals and an axon transmitting signals away

Fig: 14 Green algae Diagram

Chlorophyll a and b pigments provide green algae, which are a varied collection of photosynthetic eukaryotes that belong to the family Chlorophyceae, their grass-green hue. They can be filamentous, colonial, or unicellular, and they have a variety of chloroplast morphologies, such as spiral, discoid, or plate-like.

Fig: 15 Life Cycle of Gymnosperms Diagram

The dominant diploid sporophyte, or the plant itself, generates spores in both male and female cones during the diplontic life cycle of gymnosperms. Tiny, dependent haploid male gametophytes (pollen) and female gametophytes (in ovules) are produced from these spores.

Practicing these essential diagrams is a game-changer for your CBSE Class 11 Biology exams. They transform complex theories into clear, memorable visuals, making revision efficient and effective. By focusing on these key illustrations, you not only prepare for diagram-based questions but also solidify your overall understanding of the subject, setting a strong foundation for future studies.

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CBSE Class 11 Biology Syllabus 2025-26