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Q1. Processes such as nutrition, respiration, excretion and reproduction, which are essential for the survival of living beings, are collectively called
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Q2. The long tube in which complex food components are broken down into simpler forms, starting at the mouth and ending at the anus, is called the
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Q3. In the mouth, the initial breakdown of food into smaller pieces by crushing and chewing with teeth is called
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Q4. When a piece of chapati is chewed for a long time, it begins to taste sweet because saliva contains a digestive juice that breaks down
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Q5. The long, flexible tube that carries chewed food from the mouth to the stomach is called the
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Q6. The secretion released by the inner lining of the stomach contains digestive juice, acid and
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Q7. The approximate length of the small intestine in human beings is about
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Q8. Bile, which neutralises the acid coming from the stomach and breaks down fat into tiny droplets, is secreted by the
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Q9. Thousands of finger-like projections on the inner lining of the small intestine increase the surface area for efficient
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Q10. The process by which the undigested food is finally expelled out of the body through the anus is called
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Q11. In cows and buffaloes, partially digested food is brought back to the mouth for gradual chewing. This process is called
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Q12. Birds do not have teeth. The muscular chamber in which their food is broken down, often with the help of swallowed grit, is called the
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Q13. Inside the lungs, the windpipe branches further and ends in small balloon-like sacs called
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Q14. The dome-shaped muscle present below the lungs that helps in inhalation and exhalation is the
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Q15. Most aquatic animals like fish breathe through specialised structures called
