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Standard XII
Biology
Absorption of Food
Question

Assimilation is:
  1. The process of breaking large food molecules into simpler molecules.
  2. The process by which undigested food is released out of the body.
  3. The process by which the absorbed food carried by the blood is utilized by the cells of the body.
  4. Process of exchange of oxygen and carbon dioxide between the haemoglobin molecules and the cells of the body.

A
The process of breaking large food molecules into simpler molecules.
B
Process of exchange of oxygen and carbon dioxide between the haemoglobin molecules and the cells of the body.
C
The process by which undigested food is released out of the body.
D
The process by which the absorbed food carried by the blood is utilized by the cells of the body.
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Solution
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Biological assimilation, or bio-assimilation, is the combination of two processes to supply cells with nutrients. The first is the process of absorption of vitamins, minerals, and other chemicals from food within the gastrointestinal tract. The second process of bio assimilation is the chemical alteration of substances in the bloodstream by the liver or cellular secretions. Hence, assimilation is the process by which the absorbed food carried by the blood is used by the cells of the body for their activities.

So, the correct answer is 'The process by which the absorbed food carried by the blood is utilized by the cells of the body'.

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Similar Questions
Q1

A unicellular animal P having no fixed shape ingests a food particle by forming temporary finger-like projections Q. The food particle is engulfed with a little surrounding water to form a temporary stomach R inside it. The chemicals S from surrounding cytoplasm enter into R and break down food into small and soluble molecules by chemical reactions. The digested food is absorbed directly into the cytoplasm by the process T. The undigested food is thrown out of the body by the rupture of a cell organelle U in a process called V.
(a) Name the unicellular animal P.
(b) What are (i) Q and (ii) R?
(c) Name (i) chemical S, and (ii) process T.
(d) Name (i) organelle U, and (ii) process V.

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Q2

Question 18
Following statements describe the five steps in animal nutrition. Read each statement and give one word for each statement. Write the terms that describes each process.

(a) Transportation of absorbed food to different parts of 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.

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Q3

Breathing is a process that:
(i) Provides oxygen to the body.
(ii) Breaks down food to release energy.
(iii) Helps the body to get rid of carbon dioxide.
(iv) Produces water in the cells.
Which of the following correctly defines the characteristics of breathing?


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Q4
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of:
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Q5

The process by which oxygen is used to burn down food chemically and released energy in the body is known as?

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