DIGESTIVE SYSYEM CLASS VI ICSE
CLASS – VI
SUBJECT – BIOLOGY
A. VERY SHORT TYPE QUESTION: –
- Write the types simple sugar.
Ans. Glucose, Fructose, Sucrose and Lactose.
- Write the example of complex sugar.
Ans. Starch is an example of complex sugar.
- Which food contains lactose?
Ans. Milk contains lactose.
- What is the simplest form protein?
Ans. Amino acid.
- Which Vitamin is not present milk?
Ans. Vitamin C.
- What is the cause of Scurvy?
Ans. Deficiency of vitamin e.
- What is the deficiency disease of calcium?
- Give examples of roughage.
Ans. I’sabgul and green vegetables.
B. FILL IN THE BLANKS: –
- _______ contains sucrose.
- _______ is made up of Carbon, Hydrogen and Oxygen.
- Fats are made up of _____ and ______.
Ans. Fatly acid and Glycerol.
- Unpolished rice is source of ______ and _____.
Ans. Iron and Vitamin B complex.
- Lemon, orange, Tomato and Amla are found in __.
Ans. Vitamin e.
- Lack of Iron causes _______.
- Deficiency of ______ causes goitre.
C. SHORT TYPE QUESTION: –
1) Write the examples of protein.
Ans. Protein can be derived from animal and plant. From plants we get protein from pulses, pea, gram, rajma, soyabean etc. From animals we get protein from fish, meat, egg etc.
2) How much vitamin is needed by body?
Ans. Vitamins are very important for functioning of body, but our body requires vitamin in very small quantities.
3) What is deficiency disease?
Ans. Lack of one or more vitamins and minerals can lead to the disease called deficiency disease which is non-communicable disease. e.g. Scurvy, Ricket etc.
4) What are the source of vitamin ‘B’ Complex.
Ans. Unpolished rice, germinating seeds, milk, egg, meat and Yeast are sources of vitamin ‘B’ Complex.
5) Why vitamin D is called “Sunshine” vitamin.
Ans. Vitamin D is synthesised in the skin with the help of sunlight. It is only one vitamin which can be
synthesised in our body. That is why vitamin D is called “Sunshine vitamin”.
6) What is Xerophthalmia? How is it prevented?
Ans. Xerophthalmia is a disease where patient cannot see in night. This is also known as night blindness.
It is prevented by intaking vitamin A rich food.
7) Why is roughage important? Give example of some roughage.
Ans. Roughage is not digested in our stomach but helps to clear our bowel. Regular intake of roughage prevents constipation. e.g. Isabgul, Green leafy vegetable.
8) What are the source of Iodine?
Ans. Iodine is found mainly salt fortified with iodine. Beside it, it is also found in seafood, root
vegetables like beat and turnip.
9) Classify nutrients.
Ans. Nutrients can be classified into five major group:
- a) Carbohydrates; b) Fats; c) Proteins; d) Vitamins; e) Minerals.
10) Why do we need nutrient?
Ans. The body needs nutrients to carry out various functions like digestion, respiration etc. These nutrients can be obtained in various food.
11) What is the function of Carbohydrates?
Ans. Carbohydrates provide instant energy while in taking.
12) Which stem is rich in starch?
Ans. Various cereal grains like rice, maize, wheat are rich in starch but out of the stems potato is an underground stem containing starch.
13) What is organ system?
Ans. Group of organs working together is called organ system. e.g. Nervous system, Digestive system, Respiratory system.
14) Write some examples of fat.
Ans. Fats are found in oil, milk, butter, ghee, nuts and red meat.
15) How does fat help in insulation?
Ans. Fat forms a layer under skin to protect body from cold. In this way this layer acts as insulator of body.
16) Which foods are categorised as energy giving food?
Ans. Carbohydrate and fat together are grouped as energy giving food like rice, sugar, honey, oil, ghee, butter.
17) Why is protein called body building food?
Ans. Proteins help to build muscles and blood. Some parts of our body like hair and nails are made entirely of protein. That is why protein is called body building food.
18) Why vitamins and minerals are called protective food?
Ans. Vitamins and minerals together protect us from various non-communicable disease and help to keep our body healthy that is why these are called protective food.
19)What is mastication?
Ans. Ingested food is first mechanically broken down in the month when we chew it with our teeth. This process is called mastication. This is also known as physical digestion.
20)What is Peristalsis?
Ans. Peristalsis is a series of contraction down the wall of esophagus through which food is pushed down from month to stomach.
D. LONG TYPE QUESTION
1) How water is useful to us?
Ans. Water is essential for our survival. All chemical reactions in our body occur in the presence of water. Food cannot be digested without water. A large part of blood is water. Water also helps in expelling sweat and urine and regulating our body temperature.
2)What is the function of gastric juice?
Ans. The gastric juice contains
- Hydrochloric acid: It kills bacteria.
- Enzyme gastric lipase: It breaks fat.
- Enzyme pepsin: It breaks down protein into peptides.
3)How the is absorbed?
Ans. The simple molecules of digested food are absorbed mostly in jejunum & ileum. The villi lining the jejunum & ilium facilitate absorption by providing a larger surface area. Digested food molecules enter the blood stream through the walls of the capillaries that supply blood to the villi. The blood carries them to the cells, where they are utilized.
4)Write few steps to maintain good health.
Ans. Steps to maintain good health are:
- We should eat at fixed hours.
- We should chew the food properly.
- We should wash our hand by hand wash before taking food.
- We should drink 3 liters to 5 liters water daily.
- We should go to bed early.
5)Describe the structure of small intestine.
Ans. Small intestine is a long coiled tube measuring about 6 m. in an adult. It is divided into three parts: Duodenum; Jejunum & ileum. The inner surface of the small intestine has millions of folds, shaped like finger called villi, help in absorption of food.
E. Write down the concerned vitamins and minerals deficiency of which cause the following disease.
i) Night blindness;
Ans. i) Night blindness – Vitamin A.
ii) Beri-Beri – Vitamin B
iii) Scurvy – Vitamin C
iv) Ricket – Vitamin D and Calcium
v) Goitre – Iodine
vi) Anaemia – Iron.