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I. Find the odd one out
1. dentine, caecum, enamel, pulp cavity
Ans: Caecum is the odd one out.
Explanation: This is because dentine, enamel and pulp cavity are parts of a tooth whereas a caecum is present between the ileum and the ascending colon.
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2. duodenum, jejunum, colon, ileum
Ans: Colon is the odd one out.
Explanation: This is because the duodenum, jejunum and ileum are parts of the small intestine whereas the colon is the largest part in the large intestine.
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II. Answer the following questions
1. What is balanced diet?
Ans: A diet that consists of all nutrients (that is carbohydrates, proteins, fats, vitamins and minerals) along with roughage and water consumed in an adequate amount is known as a balanced diet.
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2. What is transpiration?
Ans: The process in which a plant loses water in the form of water vapours is known as transpiration. It is a way a plant excretes the excess water present in it.
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3. Is liver an excretory organ? If yes, what does it remove?
Ans: Yes, the liver is a very essential excretory organ present in our body. Several substances in the blood, also toxins, are broken down in the liver. Bilirubin, a waste product of the haemoglobin catabolism, is also excreted by the liver.
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4. Name the enzymes that digest proteins.
Ans: Pepsin, Trypsin, Dipeptidases, etc are some enzymes that digest proteins.
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5. List the functions of the tongue.
Ans: The functions of the tongue are -:
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III. Answer the following in detail.
1. Explain the various steps involved in nutrition in human beings.
Ans: There are five main steps involved in the nutrition of human beings. Let's discuss each of them in detail.
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2. Explain the mechanism of opening and closing of a stomata.
Ans: The mechanism of opening and closing of stomata are as below.
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