Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

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

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

  1. Marasmus

  2. Rickets

  3. KwashiorKor

  4. Pellagra
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Marasmus is a form of severe malnutrition caused by a deficiency of both proteins and calories, typically seen in infants when breastfeeding is stopped early.

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

Which of the following statement is incorrect related to digestion?

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
                                         

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

The final products of digestion should be

  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.
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.
Multiple choice biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

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

  1. Karl August Folkers

  2. Christian Hansen

  3. Richard Kuhn

  4. George Wald
Reveal answer Fill a bubble to check yourself
B Correct answer
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).

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

In amoeba, the digestion is intracellular because

  1. Amoeba is unicellular

  2. Amoeba is multicellular

  3. Amoeba is found in a pond

  4. Amoeba is a microscopic animal
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Mechanical

  2. Chemical

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
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'

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

Defaecation is carried out by mass peristaltic movement and is a

  1. Voluntary process

  2. Involuntary process

  3. Partly voluntary and partly involuntary process

  4. Initially involuntary process then voluntary process
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Defecation involves the voluntary control of the external anal sphincter, which allows an individual to decide when to pass stool, despite the peristaltic movement being involuntary.

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

Amoeba engulfs food by the process of

  1. Photosynthesis

  2. Phagocytosis

  3. Respiration

  4. Meiosis
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Amoeba procures food through

  1. Proboscis

  2. Pseudopodia

  3. Cilia

  4. Tongue
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

The inner lining of the stomach secretes

  1. Mucous

  2. Hydrochloric acid

  3. Digestive enzymes

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.