The blog discusses the Questions and Answers from the lesson Busy at Work – Our Internal Organs, Environmental Science, Part 1, from Class 5. Students can use these answers for reference in their studies.
Q1. Whats the solution ?
• A person has fainted and a crowd of people has surrounded him.
Ans. When a person has fainted and a crowd of people has surrounded him, the following things need to be done in emergency:
1. Ask the people not to crowd nearby and allow fresh air to be available to the fainted person.
2. Sprinkle some cold water on the face of the fainted person, see if he responds.
3. In case if he does not respond, immediately seek medical help.
Q2. Use your brain power !
1. Why do we sometimes choke suddenly while eating ?
Ans. Sometimes we choke suddenly while eating because :
(a) The trachea and the oesophagus both have a single opening at the upper end called the throat.
(b) A flap covers the trachea when food is to be swallowed.
(c) Sometimes when we eat in a hurry the food enters the trachea and we face choking.
2. How is the air that we inhale purified in our body ?
Ans. The air that we inhale is purified in the following way :
(a) The inner part of the nose has tiny hairs called as cilia.
(b) Also there is a stick substance called mucus inside the nose.
(c) The air consisting dust particles is filtered with the help of cilia and the mucus and therefore the air gets purified before entering our body.
Q3. Fill in the blanks.
1. Oxygen gas is transported to all parts of the body.
2. The stomach is like a bag.
Q4. Match the following.
Q5. Answer the following questions:
1. Name the systems that carry out the different functions of the body.
Ans. The systems that carry out different functions of the body are :
(a) respiratory system
(b) digestive system
(c) circulatory system
(d) nervous system
(e) skeletal system
(f) excretory system
2. Describe how the exchange of oxygen and carbon dioxide gases takes place in the lungs.
Ans. The exchange of oxygen and carbon dioxide gases takes place in the lungs as follows:
(a) During inhalation the air from outside reaches the alveoli of the lungs.
(b) The oxygen from the air enters the blood vessels surrounding the alveoli.
(c) The oxygen is supplied to the entire bosy by a network of blood vessels.
(d) Simultaneously the carbondioxide from the blood stream is brought to the alveoli of the lungs.
(e) During exhalation the carbondioxide is given out of the body.
3. Why do we call saliva a digestive juice ?
Ans. The saliva is called a digestive juice because :
(a) The salivary glands secrete saliva.
(b) With the help of saliva the food is made into a bolus.
(c) The saliva also contains a starch digesting enzyme that convert starch into sugar.
Q6. Choose the appropriate word from the brackets.
(circulation, trachea, diaphragm)
1. Respiration takes place because of its up and down movement.
2. The process of keeping the blood flowing continuously throughout the body.
3. Air that enters through the nose passes into this tube.