class 7 nutrition in animals TB FC

How is breathing different from respiration?

• Breathing is a chemical process, while respiration is a physical process.

• Breathing involves the exchange of gases, while respiration is the release of energy.

• Breathing is a voluntary action, while respiration is involuntary.

• Breathing is physical (air in/out) and respiration is chemical (energy release).

How much oxygen and carbon dioxide in inhaled vs exhaled air?

• Inhaled: ~21% O₂, ~0.04% CO₂; Exhaled: ~16-17% O₂, ~4-5% CO₂

• Inhaled: ~15% O₂, ~0.03% CO₂; Exhaled: ~18% O₂, ~3% CO₂

• Inhaled: ~25% O₂, ~0.05% CO₂; Exhaled: ~10% O₂, ~6% CO₂

• Inhaled: ~20% O₂, ~0.02% CO₂; Exhaled: ~17% O₂, ~2% CO₂

Why is smoking harmful?

• It improves lung function and health.

• It damages lungs and increases the risk of lung cancer and respiratory illness.

• It has no effect on health.

• It helps in weight loss.

Where does digestion occur?

• In the alimentary canal, a long tube starting at the mouth and ending at the anus.

• In the stomach only.

• In the small intestine only.

• In the lungs.

What are life processes?

• Nutrition, respiration, circulation, excretion, and reproduction

• Growth, development, adaptation, and evolution

• Movement, response to stimuli, and homeostasis

• Photosynthesis, digestion, and fermentation

What happens in the stomach during digestion?

• Food is churned and mixed with digestive juices. Acid kills bacteria and helps protein digestion. Mucus protects stomach lining.

• Food is absorbed directly into the bloodstream.

• Food is broken down into smaller pieces by teeth.

• Food is stored in the stomach without any processing.

What are the main components of food?

• Vitamins, minerals, and water

• Carbohydrates, proteins, and fats

• Fiber, sugars, and starches

• Antioxidants, enzymes, and probiotics

How do birds digest food without teeth?

• They have a gizzard, a muscular organ that grinds food with the help of swallowed stones.

• They use their beaks to tear food into smaller pieces.

• They swallow food whole and rely on stomach acids to break it down.

• They have specialized enzymes in their saliva that digest food before swallowing.

What happens in the large intestine?

• Absorbs nutrients and oxygen into the bloodstream.

• Absorbs water and salts, forms semi-solid waste (stool), and stores stool in the rectum for egestion.

• Breaks down proteins and fats into amino acids and fatty acids.

• Produces bile for digestion.

What are the main parts of the human respiratory system?

• Nostrils → Nasal passage → Windpipe → Lungs → Bronchi → Alveoli

• Mouth → Esophagus → Stomach → Intestines → Lungs

• Nostrils → Trachea → Heart → Lungs → Alveoli

• Nasal passage → Lungs → Bronchi → Diaphragm → Alveoli