Tag: biology

Questions Related to biology

When breast feeding is replaced by less nutritive food low in proteins and calories ; the infants below the age of one year are likely to suffer from

biology nutrition minerals and vitamins nutrition and diet role of various nutrients

  1. Marasmus

  2. Rickets

  3. KwashiorKor

  4. Pellagra

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Correct Option: A

Which of the following statement is incorrect related to digestion?

biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

  1. Digestion is the breakdown of large insoluble food molecules into small water-soluble food molecules.

  2. It is a anabolic process.

  3. Digestion is both voluntary and involuntary process.

  4. None of these.

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Correct Option: B
Explanation:

A) Digestion is the breakdown of large insoluble food molecules into small water-soluble food molecules.

B) It is a catabolic process as it breaks down the molecule into a simple form.
C) It is voluntary until swallowing as food is swallowed the whole process becomes involuntary.

So the correct option is '(B) It is an anabolic process.
                                         

The final products of digestion should be

biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

  1. Fat soluble and should be able to pass through cell walls.

  2. Water soluble and should be able to pass through cell walls.

  3. Fat soluble and should be able to pass through cell membranes.

  4. Water soluble and should be able to pass through cell membranes.

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Correct Option: D
Explanation:
  •  Digestion is catabolic process in the digestive tract where ingested food is converted into simpler, soluble and diffusible substances that can be assimilated by the body and absorbed into the blood from the intestinal walls.
  • The end product should be water soluble as it has to combine with the plasma of blood.
  • Absorption at intestinal walls is through cell membranes of intestinal cells and walls of blood capillaries.
  • So, the correct answer is 'Water soluble and should be able to pass through cell membranes'.

Which scientist first extracted rennin from a calf stomach helping to make cheese more easily?

biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

  1. Karl August Folkers

  2. Christian Hansen

  3. Richard Kuhn

  4. George Wald

Show answer
Correct Option: B
Explanation:
Rennet is a complex set of enzymes produced in the stomachs of ruminant mammals. Chymosin, its key component, is a protease enzyme that curdles the casein in milk. This .Helps young mammals digest their mothers' milk. Rennet can also be used to separate milk into solid curds for cheese making. Calf rennet is extracted from the inner mucosa of the fourth stomach chamber . First extracted by 'Christian Hansen'. So, the correct option is "B" (Christian Hansen).

In amoeba, the digestion is intracellular because

biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

  1. Amoeba is unicellular

  2. Amoeba is multicellular

  3. Amoeba is found in a pond

  4. Amoeba is a microscopic animal

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Correct Option: A
Explanation:

Amoeba, a protozoan employs intracellular digestion for deriving nutrition. Food is ingested with the pseudopodium by invagination of cell membrane and subsequently stored into the food/gastric vacuole. This due to cytoplasmic movements combine with the lysosome where the food is broken down to simpler products and assimilated. Finally, the waste is removed by exocytosis by the contractile vacuole.

Digestion is a .......... process

biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

  1. Mechanical

  2. Chemical

  3. Both A and B

  4. None of the above

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Correct Option: C
Explanation:

Digestion is the combination of mechanical as it food convert into a paste by teeth through a process called as mastication and chemical process as it requires various enzymes that break down the complex food material into simpler absorbable form.

So, the correct option is 'Both A and B'

Defaecation is carried out by mass peristaltic movement and is a

biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

  1. Voluntary process

  2. Involuntary process

  3. Partly voluntary and partly involuntary process

  4. Initially involuntary process then voluntary process

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Correct Option: A

Amoeba engulfs food by the process of

biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

  1. Photosynthesis

  2. Phagocytosis

  3. Respiration

  4. Meiosis

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Correct Option: B
Explanation:

Amoeba obtains the food through phagocytosis process. Since, Amoeba has no mouth, it takes the food into it's body by means of pseudopodia, which completely enclose the particle of food, that is enveloped in vacuoles. Photosynthesis is a process used by plants and other organisms to convert light energy, normally from the Sun, into chemical energy that can be later released to fuel the organism's activities. In physiology, respiration is defined as the transport of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction. Meiosis is a process of cell division in eukaryotes characterized by: two consecutive divisions: meiosis I and meiosis II. 

Therefore, the correct answer is option B.

Amoeba procures food through

biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

  1. Proboscis

  2. Pseudopodia

  3. Cilia

  4. Tongue

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Correct Option: B
Explanation:

Pseudopods which translates to "false feet" are temporary cytoplasm-filled parts of the cell wall that are able to change their form in order to move. They are used in some eukaryotic cells to move around or to eat. Most cells that do this are called as amoeboids. The amoeba is a common example. Proboscis, cilia and tongue are absent in amoeba. 

Therefore, the correct answer is option B.

The inner lining of the stomach secretes

biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

  1. Mucous

  2. Hydrochloric acid

  3. Digestive enzymes

  4. All of the above

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Correct Option: D
Explanation:

The stomach is the main food storage tank of the body. If it were not for the stomach’s storage capacity, we would have to eat constantly instead of just a few times each day. The stomach also secretes a mixture of acid, mucus, and digestive enzymes that helps to digest and sanitize our food while it is being stored. 

Therefore, the correct answer is option D.