Science MCQ (1 Marks)

What is the role of diaphragm in breathing?

The finger-like outgrowths of Amoeba help to ingest food. However, the finger-like outgrowths of the human intestine help to

What is the main function of the lungs in the respiratory system?

Given below from (i) to (iv) are some food items.
(i) Boiled and mashed potato
(ii) Glucose solution
(iii) A slice of bread
(iv) Mustard oil
Which of the above will give a blue-black colour when tested with iodine?

What is the role of bile in digestion?

Oxygen helps break down of glucose to release

When air is blown from the mouth into a test-tube containing lime water, the lime water turns milky due to the presence of

The main purpose of respiration is to:

During the process of exhalation, the ribs move

What is the role of saliva in digestion?

The swallowed food moves downwards in the alimentary canal because of

Breathing is a process that
(i) provides O₂ to the body.
(ii) breaks down food to release energy.
(iii) helps the body to get rid of CO₂.
(iv) produces water in the cells.
Which of the following gives the correct combination of functions of breathing?

The small balloon-like sacs in the lungs where gas exchange occurs are called:

Which of the following is NOT part of the digestive system?

During inhalation, the diaphragm:

The circulatory system in humans primarily functions to:

Which animal uses moist skin for breathing?

The process of taking in air rich in oxygen is:

Diaphragm helps in:

Which of the following structures is involved in gas exchange in lungs?

Ruminants bring back partially digested food to the mouth. This process is called:

The enzyme in saliva helps in breaking down:

In birds, food is mechanically broken down in the:

Which part of the digestive system absorbs most nutrients?

The blue-black colour seen on adding iodine to boiled rice indicates the presence of:

What feature of alveoli aids efficient gas exchange?

What may happen if intestinal villi are damaged?

What explains the difference in oxygen content between inhaled and exhaled air?

Which adaptation allows birds to digest food efficiently without teeth?

Why is the small intestine long despite being called "small"?

Why does breathing rate increase during exercise?

Why do cows regurgitate their food?

In an experiment, test tube A with boiled rice and test tube B with chewed rice were both tested with iodine. What is the correct prediction and explanation?