Tag: biology

Questions Related to biology

Circulatory system also performs the function of homeostasis.

biology organization of life

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Homeostasis is a phenomenon of maintaining an equilibrium of internal environment despite constantly changing external environment. Various body systems are involved in performing the function of homeostasis. Circulatory system maintains homeostasis by continuous and controlled movement of blood that reaches every cell in the body. Nutrients pass from capillary blood into fluids surrounding the cells and waste products are removed.

Thus, the correct answer is option A.

Choose the correct answers from the alternatives given .
Homeostasis is

biology organization of life

  1. tendency to maintain constant, favourable internal conditions

  2. combination of growth, repair and energy release that is basic to life

  3. a form of reproduction involving only one sex

  4. the sum of all the chemical reactions in the body

Show answer
Correct Option: A
Explanation:
Homeostasis is the state of steady internal conditions maintained by living things.
So, the correct option is 'tendency to maintain constant, favourable internal conditions'

State whether the following statements are true or false .
Homeostasis is achieved by morphological, physiological and behavioural adaptations

biology organization of life

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Homeostasis is maintaining constant conditions inside living organisms. These might be in terms of maintenance of pH, temperature, osmolarity etc. Organisms achieve homeostasis by various adaptations. This can be understood with the example of temperature regulation in different organisms-

  • Morphological adaptation - thick blubber and fur coat in polar bears for maintaining body temperature in cold temperature.
  • Physiological adaptation - sweating to bring down body temperature in summer.
  • Behavioral adaptation - Desert lizards lack the physiological ability that mammals have to deal with the high temperatures of their habitat but manage to keep their body temperature fairly constant by behavioral means. They bask in the sun and absorb heat when their body temperature drops below the comfort zone, but move into the shade when the ambient temperature starts increasing. 
So, the correct option is 'True'.

Which of the following options exemplifies a behavioral means of homeostasis?

biology organization of life

  1. A man sweating profusely in a hot room

  2. A rhino covering itself in mud to keep cool

  3. A desert lizard basking in sun too increasing its body temperature

  4. Both (B) and (C)

Show answer
Correct Option: D
Explanation:

Some organisms show behavioral adaptations to cope with variations in their environment. A rhino covering itself in mud to keep cool and desert lizard basking in Sun to keep warm are examples of behavioral ,means of homeostasis. 

Digestion is the breaking down of large food molecules into
smaller ones. The main purpose of this is to

biology coordination in life processes ingestion of food mechanism of digestion

  1. Make the food soluble

  2. Enable the digestive enzymes to be used up

  3. Provide many different types of molecules for absorption

  4. Make the Passage of food along the gut easier

  5. Make the food insoluble

Show answer
Correct Option: C
Explanation:

Most of our foods are complicated chemical structure.
In order to be absorbed and utilized by the body, they
must be broken down into relatively simple molecules.
The process by which the complex food materials are
changed to simple molecules is called digestion.


Air or food is prevented from going into the trachea during swallowing by the

biology coordination in life processes ingestion of food mechanism of digestion

  1. larynx

  2. epiglottis

  3. pharynx

  4. tongue

Show answer
Correct Option: B
Explanation:

Epiglottis stands open during breathing, allowing air into the larynx. During swallowing it closes to prevent aspiration, forcing the swallowed liquids or food to go into the esophagus instead. It is thus the structure that diverts passage air into  the trachea and food into the esophagus

So, the correct answer is 'epiglottis'

Food and air pathway are divided at

biology coordination in life processes ingestion of food mechanism of digestion

  1. Larynx

  2. Pharynx

  3. Oesophagus

  4. Stomach

Show answer
Correct Option: B
Explanation:
The pharynx is part of the digestive system as well as the respiratory system because it carries both food and air. At the bottom of the pharynx, this pathway divides in two, one for food (the oesophagus, which leads to the stomach) and the other for air.
So, the correct option is 'Pharynx'.

Succus entericus acts in?

biology coordination in life processes ingestion of food mechanism of digestion

  1. Alkaline medium

  2. Strongly acidic medium

  3. Neutral medium

  4. Weakly acidic medium

Show answer
Correct Option: A

For how much time an average meal stays in a fish-hook stomach?

biology coordination in life processes ingestion of food mechanism of digestion

  1. 6---8 hrs

  2. 3----4 hrs

  3. 1---2 hrs

  4. 8---10 hrs

Show answer
Correct Option: B
Explanation:
  • Variables considered with feeding rate and gastric evacuation time includes temperature, season, activity, body size, gut capacity, satiety, and metabolic rate. 
  • Gastric emptying rate declines more or less exponentially with time. Larger meals first are digested at a faster rate than small meals and the amount of pepsin and acid produced was somewhat proportional to the degree of distension of the stomach.
  •  Stomach mobility often increases with the degree of stomach distension also. Gastric emptying time is approximately 3 - 4 hours.

The swallowing of food from buccopharyngeal cavity to stomach is called 

biology coordination in life processes ingestion of food mechanism of digestion

  1. Deglutition

  2. Mastication

  3. Peristalsis

  4. None of the above

Show answer
Correct Option: A