Class 7 Science — Chapter 9: Life Processes in Animals

Chapter 9: Life Processes in Animals is a chapter in Class 7 Science (Curiosity), part of the CBSE NCERT curriculum followed by over 25 million students across India. This chapter covers 9 topics including Human Digestive System Overview, Digestion in the Mouth, Digestion in the Stomach and Small Intestine. BrainWeave provides free AI-powered explanations — by voice or text, in Hindi or English — with no signup required.

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What you'll learn

▸Human Digestive System OverviewCore concept

alimentary canaldigestive systemdigestionhumancomplex food
▸Digestion in the MouthCore concept

mouthsalivastarchsugarteeth
▸Digestion in the Stomach and Small IntestineCore concept

stomachsmall intestineliverbilepancreas
▸Absorption and AssimilationCore concept

absorptionassimilationnutrientsblood vesselssmall intestine
▸Nutrition in RuminantsCore concept

ruminantsrumencudcellulosegrass-eating
▸Nutrition in Amoeba

Amoebapseudopodiafood vacuolesingle-celledingestion
▸Human Respiratory SystemCore concept

respiratory systemlungswindpipebreathingoxygen
▸Mechanism of BreathingCore concept

inhalationexhalationdiaphragmrib cagebreathing mechanism
▸Respiration in Other Organisms

gillsspiraclesstomatamoist skintracheae

Chapter Summary

Understand the overall pathway of food through the alimentary canal (mouth, oesophagus, stomach, small intestine, large intestine, anus) and the general concept of digestion as the process of breaking down complex food components into simpler substances.

Learn about the initial stages of digestion, including mechanical digestion by teeth (chewing) and chemical digestion by saliva, which breaks down starch into sugars.

Understand the roles of the stomach (churning food with acid and digestive juices to break down proteins) and the small intestine, which receives secretions from the liver (bile) and pancreas to complete the digestion of carbohydrates, fats, and proteins.

Explain how fully digested nutrients are absorbed into the bloodstream through the walls of the small intestine and then transported to be used by the body for energy, growth, and repair (assimilation).

Describe the specialized digestive system of grass-eating animals like cows, including their multi-chambered stomach (rumen) and the process of rumination (chewing the cud) to digest cellulose.

Understand how a single-celled organism like Amoeba obtains nutrition by using pseudopodia (false feet) to engulf food, forming a food vacuole for digestion, and then egesting waste.

Identify the main organs of the respiratory system (nostrils, windpipe, lungs) and trace the pathway of air into the body. Understand that respiration releases energy from digested food.

Explain the physical process of breathing (inhalation and exhalation) and the roles of the diaphragm and rib cage in changing the chest cavity volume to move air in and out of the lungs.

Compare the different ways various organisms breathe, such as insects using spiracles and tracheae, earthworms using their moist skin, fish using gills, and plants using stomata.

Practice Questions from this Chapter

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Explain how food moves through the body. Get Solution →
Describe what makes stomach acid so strong. Get Solution →
Compare animal digestive systems to ours. Get Solution →
What is the long tube extending from the mouth to the anus where food is digested? Get Solution →
According to the text, where does the journey of food begin in the human body? Get Solution →
The process of breaking down food into smaller pieces by crushing and chewing is called what? Get Solution →
What substance in the mouth contains a digestive juice that breaks down starch into sugar? Get Solution →
What is the name of the long, flexible tube that food passes through from the mouth to the stomach? Get Solution →

Did you know?

💡 The human small intestine can stretch over six meters long.
💡 Your stomach acid is strong enough to dissolve razor blades.
💡 Cows have four different stomach chambers for digestion.
💡 Some spiders digest prey externally by injecting digestive juices.
💡 Humans produce approximately one liter of saliva daily.

Frequently Asked Questions

How many topics are covered in this chapter?

This chapter covers 9 key topics: Human Digestive System Overview, Digestion in the Mouth, Digestion in the Stomach and Small Intestine, Absorption and Assimilation, Nutrition in Ruminants, and more. The BrainWeave AI tutor explains each one with examples.

Is Chapter 9: Life Processes in Animals important for board exams?

Class 7 is a foundation year. Mastering this chapter now will help you build strong fundamentals for the higher classes.

Can I get NCERT solutions for this chapter in Hindi?

Yes. BrainWeave's AI tutor supports Hindi, English, and Hinglish for both voice and text chat. Just ask your question in your preferred language.

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Related Chapters

Chapter 8: Measurement of Time and Motion

Chapter 10: Life Processes in Plants

Chapter 7: Heat Transfer in Nature

Chapter 12: Earth, Moon, and the Sun

Chapter 6: A Stage of Growth and Change

Chapter 11: Light: Shadows and Reflections

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