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Which of the following is an incorrect statement? (a) Energy is essential for the life process (b) Organisms grow with time (c) Movement of molecules does not take place among cells (d) Organisms must repair their body and maintain time

Movement of molecules does not take place among cells Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion. Hence, the Movement of molecules takes place in a cell.

BiologyClass 10ICSE

The oxygen liberated from plants during photosynthesis comes from (a) Glucose (b) Water (c) Carbon dioxide (d) Chlorophyll

Water The oxygen during photosynthesis comes from split water molecules. During photosynthesis, the plant absorbs water and carbon dioxide. After the absorption, the water molecules are disassembled and converted into sugar and oxygen.

BiologyClass 10ICSE

Which of the following are correct functions of two components of pancreatic juice trypsin and lipase? (a) Trypsin digests proteins and lipase carbohydrates (b) Trypsin digests emulsified fats and lipase proteins (c) Trypsin digests starch and lipase fats (d) Trypsin digests proteins and lipase emulsified fats

Pancreatic juice contains trypsin acts on proteins. Fats are not soluble in water and hence lipids act on fats.

BiologyClass 10ICSE

If the saliva is lacking in salivary amylase, then which of the following processes taking place in the buccal cavity will be affected? (a) Proteins breaking down into amino acids (b) Starch breaking down into sugars (c) Fats breaking down into fatty acids and glycerol (d) Intestinal layer breaking down to ulcers

(b) Starch breaking down into sugars In case, saliva is lacking, it will affect the breakdown of starch. The protein digestion begins in the stomach by the enzyme pepsin and completes in the small intestine by enzyme trypsin.

BiologyClass 10ICSE

Which of the following component of our food is digested by an enzyme which is present in saliva as well as in pancreatic juice? (a) Proteins (b) Fats (c) Minerals (d) Carbohydrates

Carbohydrates Carbohydrates that starch and is digested by salivary amylase present in saliva are converted into maltose and it also gets digested by pancreatic juices in the pancreas.

BiologyClass 10ICSE

Which part of the alimentary canal receives bile from the liver? (a) Esophagus (b) small intestine (c) Stomach (d) Large intestine

(b) Small intestine The small intestine receives the bile from the liver which helps in the breakdown of fats. Bile juice is produced in the liver and stored in gall bladder.

BiologyClass 10ICSE

The inner lining of the stomach is protected by one of the following from the harmful effect of hydrochloric acid. That is (a) Pepsin (b) Mucus (c) Saliva (d) Bile

(b) Mucus The mucus in gastric juice helps protect the stomach wall from the corrosive effect of hydrochloric acid.

BiologyClass 10ICSE

Where are proteins digested in the alimentary canal? (a) Small intestine (b) Esophagus (c) mouth (d) stomach

(d) Stomach Chemical digestion of protein begins in the stomach and ends in the small intestine. The body recycles amino acids to make more proteins.

BiologyClass 10ICSE

Which of the following is correct regarding bile? (a) Secreted by bile duct and stored in the liver (b) Secreted by the gall bladder and stored in the liver (c) Secreted by the liver and stored in the bile duct (d) Secreted by the liver and stored in the gall bladder

(d) Secreted by the liver and stored in the gall bladder Bile is a fluid that is made by the liver, stored in the gallbladder and passes through the common bile duct where it helps in the digestion of fat.

BiologyClass 10ICSE

Pancreatic juice contains enzymes which digest, (a) Proteins and carbohydrates only (b) Proteins and fats only (c) Fats and carbohydrates only (d) Proteins, fats and carbohydrates

Proteins, fats and carbohydrates Trypsin- helps to digest proteins. Amylase - helps to digest sugars (carbohydrates). Lipase - helps to digest fat.

BiologyClass 10ICSE

When carrying the starch test on a leaf, why is it important to boil the leaf in an alcohol? (a) To dissolve the waxy cuticle (b) To make the cells more permeable to iodine solution (c) To remove the chlorophyll (d) To stop the chemical reaction in the cell

(a) To remove the chlorophyll On boiling the leaf in alcohol, the leaf becomes decolorized, and when it is treated with iodine, the blue- black color clearly indicates the presence of starch. To avoid the interference of green color, it is treated with alcohol.

BiologyClass 10ICSE

In the human digestive system, the enzymes pepsin and trypsin are secreted respectively by (a) Pancreas and liver (b) Stomach and salivary glands (c) Pancreas and gall bladder (d) Stomach and pancreas Answer

Stomach and pancreas Pepsin is an enzyme that breaks down proteins into smaller amino acids. In the small intestine, trypsin breaks down proteins, continuing the process of digestion that began in the stomach.

BiologyClass 10ICSE

The correct order of steps occurring in nutrition in animals is (a) Ingestion Absorption Digestion Assimilation Egestion (b) Ingestion Digestion Assimilation Absorption Egestion (c) Ingestion Digestion Absorption Assimilation Egestion (d) Ingestion Assimilation Digestion Absorption Egestion

Answer (c) Ingestion Digestion Absorption Assimilation Egestion Ingestion: The process the food is taken inside through mouth and broken down by teeth and initial digestion takes place in the mouth by saliva. Digestion: The process in which food is digested by using few enzymes and are used by the cells for producing energy. Absorption: The process in which cells use the energy from the digested food and helps in building tissues in our body. Assimilation: The process in which digested food moves into the cells of the Egestion: The process in which undigested food is removed out from the body through

BiologyClass 10ICSE

The autotrophic mode of nutrition requires (a) Carbon dioxide and water (b) Chlorophyll (c) Sunlight (d) All the above

All the above The mode of nutrition in which organisms make their own food by the process of photosynthesis. The process by which plants make their own food using raw materials like sunlight, chlorophyll, water and carbon dioxide is called photosynthesis.

BiologyClass 10ICSE

Two of the organisms have a holozoic mode of nutrition. These are: (a) Paramecium and Plasmodium (b) Plasmodium and Parakeet (c) Parakeet and Paramecium (d) Paramecium and Parasite

Parakeet and Paramecium The mode of nutrition in which the digestion of food is allowed only after the ingestion of food is called the holozoic mode of nutrition. Human beings are also the example of holozoic mode of nutrition.

BiologyClass 10ICSE

In the human digestive system, bile is secreted by (a) Pancreas (b) Liver (c) Kidneys (d) Stomach

Liver Bile, which is made in the liver, is released from the gallbladder to help digest fats.

BiologyClass 10ICSE

The process of digestion in human beings is completed in (a) Oesophagus (b) small intestine (c) stomach (d) large intestine

Large intestine In the large intestine, water is removed and bacteria break down some indigestible materials, producing important compounds (such as vitamin K). The concentrated waste material that remains is called feces, which is passed into the rectum and eliminated from the body through the anus.

BiologyClass 10ICSE

The process of digestion in human beings begins in (a) Stomach (b) food pipe (c) mouth (d) small intestine

Mouth Digestion begins when food enters the mouth (oral cavity). Both mechanical and chemical digestion occurs in the mouth. Teeth grind and break up food. This is called the physical or mechanical digestion.

BiologyClass 10ICSE

The length of small intestine in human adult is (a) 4.5m (b) 1.5m (c) 3.5m (d) 6.5m

(d) 6.5m The small intestine is so long because it needs a maximum amount of surface area to increase digestion and nutrient absorption.

BiologyClass 10ICSE

One of the following has a saprophytic mode of nutrition. The organism is (a) Mushroom (b) Malarial parasite (c) Leech (d) Lice

Mushroom The mode of nutrition in which organisms feed on dead and decaying matter. Mushroom depends on dead and decaying plants for food.

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