Class 7 Science - RAJASTHAN
Life Processes in Animals
The chapter 'Life Processes in Animals' for Class 7 Rajasthan Board explores the essential biological activities that keep animals alive. Students will learn about nutrition and digestion in various animals, including human digestive processes and ruminants like cows. It also covers the mechanism of breathing and respiration, the transportation of substances through the circulatory and excretory systems, and how animals reproduce. Understanding these topics is crucial for scoring well in Rajasthan Board exams as they form the foundation of human and animal physiology, often featured in both objective and short-answer questions.
Start Learning FreeKey Concepts
Digestion in Humans
The process of breaking down complex food substances into simpler, soluble forms as food passes through the alimentary canal and digestive glands.
Ruminants and Rumination
Grass-eating animals quickly swallow grass and store it in the rumen, where it is partially digested as 'cud' before being brought back up for thorough chewing.
Respiration and Breathing
The exchange of gases where organisms take in oxygen to break down food for energy and release carbon dioxide, occurring through lungs, gills, or skin depending on the animal.
Circulatory System
The transport network consisting of the heart, blood vessels, and blood that distributes oxygen, nutrients, and waste products throughout the animal's body.
Excretion in Animals
The biological process of removing harmful metabolic waste products from the body using specialized organs like kidneys in humans.
Important Formulas
Board Exam Info
In the Rajasthan Board Class 7 Science examinations, this chapter typically carries around 6 to 8 marks. Questions generally include fill-in-the-blanks, matching columns, diagram-based questions (like the human digestive system or respiratory system), and short descriptive answers explaining life processes.
Frequently Asked Questions
Cellulose is a type of carbohydrate found in plants. Humans cannot digest it because our bodies lack the specific enzymes and bacteria needed to break down cellulose walls, unlike ruminants.
Cellulose is a plant carbohydrate. Humans lack the specific bacteria in their digestive tract to break it down, whereas ruminants like cows have a special chamber called the rumen for this purpose.
Earthworms breathe through their skin. Their skin is moist and thin, allowing gases to pass through it directly into their blood vessels.
Earthworms breathe through their moist and slimy skin, which allows oxygen to pass directly into their blood.
During heavy exercise, muscle cells respire anaerobically due to a temporary lack of oxygen, producing lactic acid. The accumulation of lactic acid causes painful muscle cramps.
Muscle cramps occur due to the partial breakdown of glucose into lactic acid during anaerobic respiration when there is a temporary shortage of oxygen.
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