Important Diagrams for CBSE Class 7

Diagrams in Biology are essential for getting higher marks, particularly for the yearly CBSE Class 7 Examinations; they are as important as formulas and equations. The visual representation of concepts also benefits the understanding of the topics in Biology. The collection of important Biology diagrams for 7th grade is provided below.

Photosynthesis

Only plants have the ability to prepare their food from water, carbon dioxide, and minerals. The production of food by plants is known as photosynthesis.

Photosynthesis

As seen in the diagram, roots collect water and minerals from the earth and carry them to the leaves. Through stomata, carbon dioxide from the air is carried in. Chlorophyll facilitates the sunlight energy absorption of leaves. Food is prepared using this energy combining carbon dioxide and water as ingredients.

Digestion in Amoeba

A tiny, single-celled organism called an Amoeba can be found in stagnant water. It consumes several minute organisms as food. When it detects food, it spreads out pseudopodia that envelop the food particle. A food vacuole holds the food trapped. The food vacuole receives secretions of digestive juices. They combine with the food and transform it into less complex elements. The ingested food is steadily absorbed.

Digestion in Amoeba

Schematic Diagram of Circulation

The three primary kinds of blood vessels are capillaries, veins, and arteries. Endothelial cells form capillaries' outer surface, encased in basement membranes. Veins carry deoxygenated blood to the heart. It returns to the heart after being oxygenated in the lungs. All regions of the body receive oxygenated blood from the heart. It is called double circulation because blood circulates twice through the heart in a single cycle.

Schematic Diagram of Circulation

Structure of Heart

Our bodies have an organ called the heart, which beats continually to pump blood into our blood arteries. The four chambers of the heart restrict the mixing of blood which has carbon dioxide, with blood which has oxygen. They are referred to as ventricles and atria. The ventricles are the lowest two chambers of the heart, and the atria are the top two chambers. With valves, these two chambers are separated into two chambers inside themselves.

Structure of Heart

Human Excretory System

Excretion is the process of removing waste created in the living cells of organisms. One of the main waste products created by our bodies is urea. Urine is a yellowish liquid waste produced when urea and other undesirable salts break down in water inside the body. The excretory system gathers the body's liquid wastes and helps in their removal. Humans have four organs that make up their excretory system: a bladder, a urethra, two kidneys, and two ureters.

Human Excretory System

Reproductive Parts of a Flower

Pollination is a technique used in the reproduction of flowers. This procedure involves the transfer of male gametes to female ovules, where pollination occurs, and the ovules develop into seeds inside a fruit. Sepals, petals, stamens, and pistils are the key components of a flower. The male reproductive component of a flower is the stamen, and the female reproductive component is the pistil. Anthers and filaments enclose the stamen. The anthers produce pollen grains. The vegetative components of a flower are its sepals and petals.

Parts of a Flower

Pollination in Flowers

Pollination is the method by which pollen grains are carried from the anther of one flower to the stigma of that same flower or the other. When a flower on a different plant of the same species is crossed-pollinated, pollen grains from the anther enter the stigma of that flower. Male flowers produced more pollen to reach the female flower, which might not be nearby. The newly created plant possesses traits from both plants.

Pollination in Flowers

Interesting Facts

• Photosynthesis is just the reverse process of cellular respiration.

• The only organ in the human body which can float on water is the lungs.

• The amount of saliva produced by an average human every day is equal to the capacity of a can of soda.

• It is a myth that urine is toxic. It is a byproduct of blood and is non-toxic.

• The heart of a human is about the size of 2 hands clasped together.

Important Questions

1. What are the tiny pores present on the surface of leaves for the exchange of gases?

The tiny pores present on the surface of leaves for the exchange of gases in a plant are called stomata. These help in gaseous exchange and transpiration.

2. How many ovules do the ovaries of different flowers contain?

The number of ovaries might differ for each plant depending on their species. But each ovary of the plan contains only one ovule inside them.

3. What is the pumping organ of our circulatory system?

The heart and blood vessels make up the human circulatory system. The body's pumping organ, the heart, distributes blood to every region of the body.

4. The digestive tract and the associated glands together are called?

The digestive system combines the digestive tract and the associated glands.

5. Which part of the plant is called a food factory?

Through the process of photosynthesis, leaves prepare food. As a result, they are referred to as plant food factories.

Practice Questions

1. Draw a diagram of the solar system.

2. Explain the structure of the heart.

3. Draw some drawings related to science.

4. Explain some important diagrams related to science.

Key Features

In this article, we have discussed diagrams related to science. The diagrams in the Class 7 CBSE curriculum cover various diagrams. The most important diagrams to remember are of the organs in the human body, reproduction in plants, photosynthesis and nutrition in various organisms.

Make sure you practice every diagram on this listing. Doing this will make it possible to draw these with high accuracy and comfort.