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Selective breeding is a process of (a) selecting the offsprings with desired properties. (b) selecting the parents with desired properties. (c) selecting an area for breeding. (d) selecting fine hair for good quality wool.

b) Selecting the parents with desired properties. Selective breeding is the process of crossing of two selected varieties having different... View Article

A wool fibre cannot be obtained from which of the following? (a) Goat (b) Llama (c) Alpaca (d) Moth

d) Moth Animals that yield wool are Angora goats, Llama and Alpaca. Silk moth lays eggs which develop into silkworms to yield silk but not... View Article

The silk fibre is obtained from (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk

c) Cocoon A cocoon is formed at one of the life stages of a silk moth. Caterpillar/ silkworm completely covers itself by silk. This covering is... View Article

Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. Which of the following would be the right gift for her to buy? (a) Woollen shawl (b) Silk scarf (c) Animal fur cap (d) Leather jacket

a) Woollen shawl Wool is extracted from animals such as sheep without killing them. Wool is a natural animal fibre obtained from sheep,... View Article

Which of the following is not a type of silk? (a) Mulberry silk (b) Tassar silk (c) Mooga silk (d) Moth silk

d) Moth silk Mulberry silk, Tasar Silk, and Mooga silk are the varieties of silk produced by different silkworms whereas moth silk is not a... View Article

The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture (d) silviculture

b) Sericulture Sericulture is the process of cultivating silkworms and extracting silk from them. The caterpillars of the domestic silkmoth... View Article

Label the following parts in Figure and name them. (a) The largest gland in our body. (b) The organ where protein digestion starts. (c) The organ that releases digestive juice into the small intestine. (d) The organ where bile juice gets stored.

(a) Liver is the largest gland of the human body. (b) Digestion of protein starts in the stomach of human body. (c) Pancreas is the organ that... View Article

Read the following passage carefully and answer the questions that follow it. Bile juice is stored in a sac called, gall bladder, located near its organ of secretion, liver. The gall bladder releases the bile juice into the small intestine whenever food reaches there. Though bile juice is devoid of any digestive enzymes, it is required for the digestion of fats. The fats cannot be digested easily because they are insoluble in water and are present as large globules. Bile juice breaks down big fat droplets into smaller droplets. These are then easily digested by the enzymes released from the pancreas. (a) Which organ secretes the bile juice? (b) Why is digestion of fats difficult as compared to that of other nutrients? (c) How does bile juice help in digestion of fat? (d) Where is the digestion of fat completed? (e) Does bile juice digest fat completely?

(a) Liver, the largest gland of the human body produces bile juice which gets stored in gall bladder and used when required. (b) Digestion of... View Article

Label the below given Figure as directed below in (i) to (iv) and give the name of each type of teeth. (i) The cutting and biting teeth as ‘A’ (ii) The piercing and tearing teeth as ‘B’ (iii) The grinding and chewing teeth as ‘C’ (iv) The grinding teeth present only in adult as ‘D’

(i) The cutting and biting teeth labelled as A are the incisors. They are the first teeth to develop in an infant. They are present in the front... View Article

Amoeba pushes out _ around the food and traps it in a food _.

Amoeba pushes out pseudopodia around the food and traps it in a food vacuole. Amoeba does not have any specialized organ for nutrition. Its... View Article

Tongue is attached at the _ to the floor of the mouth cavity and is free at the _.

c) Back d) Front Tongue is attached at the back to the floor of the mouth cavity and is free at the front. It is a muscular organ which helps... View Article

Large intestine absorbs and some from the undigested food.

(b) Large intestine absorbs water and some salts from the undigested food. The large intestine reabsorbs the water from indigestible food... View Article

The digestion of all food components is completed by the ____________ juice.

Intestinal juice The digestion of all food components is completed by the intestinal juice .These are a group of enzymes which help in complete... View Article

Boojho and Paheli were eating their food hurriedly so that they could go out and play during the recess. Suddenly, Boojho started coughing violently. Think of the reasons why he was coughing and discuss with your friends.

Sometimes when anyone eats hurriedly, talks, laughs or does another similar activity while eating, the flap such as valve, epiglottis closing... View Article

Ruminants such as cows and buffaloes swallow their food hurriedly and then sit restfully and chew their food. Can you reason why?

Ruminants such as cows and buffaloes chew the food quickly and swallow it. This swallowed food is brought back from the stomach to mouth and... View Article

‘A’ got her gall bladder removed surgically as she was diagnosed with stones in her gall bladder. After the surgery, she faced problems in the digestion of certain food items when consumed in bulk. Can you tell which kind of food items would they be and why?

Bile juice is produced by the liver that is collected and stored in a location named gall bladder. The main role of bile juice is to break fat... View Article

Boojho took some grains of boiled rice in a test tube ‘A’ and Paheli took boiled and chewed rice in a test tube ‘B’. Both of them poured 1 – 2 drops of iodine solution into the test tube and observed the colour change. What colour change would they have observed? Give reasons for your answer.

In test-tube A, the boiled rice contains starch. When we add 1-2 drops of iodine, the combination turns in the shade of blue-black. This... View Article

Following statements describe the five steps in animal nutrition. Read each statement and give one word for each statement. Write the terms that describe each process. (a) Transportation of absorbed food to different parts of the body and their utilisation. (b) Breaking of complex food substances into simpler and soluble substances. (c) Removal of undigested and unabsorbed solid residues of food from the body. (d) Taking food into the body. (e) Transport of digested and soluble food from the intestine to blood vessels.

The terms that describe each process are: a) Transportation of absorbed food to different parts of the body and its utilisation: Assimilation b)... View Article

Fill in the blanks with suitable words: (a) The alimentary canal stretches from ___ to _. (b) Teeth are rooted in separate in between the _. (c) Digestion of food starts in _ and gets completed in _. (d) ___ is the largest gland in the human body.

(a) The alimentary canal stretches from the buccal cavity to the anus. buccal cavity is the starting point of alimentary canal, while it... View Article

You were blindfolded and asked to identify the drinks provided in two different glasses. You could identify drink A as lime juice and B as bitter gourd juice. How could you do it in spite of being blindfolded?

In the tongue different types of taste buds are present These taste buds help to identify the various types of tastes such as spicy, salty, sweet... View Article

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