The human stomach can expand and contract while in taking and excreting food because it is made up of

Bones

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Muscles

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Blood

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Iron

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Solution

The correct option is B Muscles
The walls of your stomach contain layers of smooth muscle. As food enters the walls begin to stretch, prompting the smooth muscle to contract. This muscle activity leads to the physical mixing and breaking down of food in the stomach, known as churning. So, the human stomach can expand and contract while intaking and excreting food because it is made of muscles and not of iron or bones, blood is present in the vessel in the wall of stomach for transportation of soluble nutrients and oxygen for proper functioning. Thus, option B is correct.

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Question 7

Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel because on heating the iron rim
(a) expands and fits onto the wooden wheel
(b) contracts and fits onto the wooden wheel
(c) no change in the size take place
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Q. An organism X is made up of a single cell. It performs all the necessary life functions like capturing and digesting food, respiration, excretion, reproduction, etc. Identify which among the following can be X.

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