Tag: organization of life

Questions Related to organization of life

Choose the correct answers from the alternatives given .
The maintenance of internal conditions of an organism within a certain boundary range is called

biology organization of life

  1. evolution

  2. metabolism

  3. adaptation

  4. homeostasis

Show answer
Correct Option: D
Explanation:

A. Evolution is a change in the inheritable characteristics of species over successive generations.

B. Metabolism is the sum total of all the chemical activities occurring in the body to sustain life.
C. Adaptation is the changes acquired by the body to sustain adverse conditions.
D. Homeostasis refers to the maintenance of a constant internal environment of the body. It is essential to maintain the living state of organisms as they can tolerate the change in internal conditions like temperature, pH etc. within a range. 
So the correct answer is 'Homeostasis'.

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. 

Water we take in, plays an important role in?

bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

  1. Metabolic processes

  2. Provide energy

  3. Prevents dehydration

  4. More than one correct answer

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Correct Option: A

Which of the following represents the metabolic anti-transparent?

bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

  1. PMA

  2. $CO _2$

  3. Aspirin

  4. All of the above

Show answer
Correct Option: A

Which of the following life processes is evolved around RNA?

bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

  1. Metabolism

  2. Translation

  3. Splicing

  4. All of these

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Correct Option: D

Respiration is a

bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

  1. Anabolic process

  2. Deamination process

  3. Catabolic process

  4. Both A and C

Show answer
Correct Option: D
Explanation:

The breaking of the C-C bonds of complex compounds through oxidation within the cells, leading to the release of a considerable amount of energy is called as respiration. As carbon-carbon covalent bonds are broken, it is a catabolic process. Respiration involves the synthesis of energy in form of ATP. The synthesis of ATP leads to the formation of several covalent linkages of phosphates. There is synthesis which are included in the anabolic processes.

Thus, the correct answer is option D.

Catabolic and anabolic pathways are often coupled in cell because

bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

  1. Both the paths have the same energy

  2. The free energy released from one pathway is used to drive other

  3. The intermediates of a catabolic pathway are used in the anabolic pathway

  4. Their enzymes are controlled by their activators and inhibitors.

Show answer
Correct Option: B
Explanation:
  • Anabolic pathways are those that require energy to synthesize larger molecules. Catabolic pathways are those that generate energy by breaking down larger molecules. Both types of pathways are required for maintaining the cell's energy balance.
  • Catabolic and anabolic pathway are coupled because catabolic reactions furnish the energy required for anabolism. Catabolic reactions transfer energy from complex molecules to ATP. Anabolic reactions transfer energy from ATP to complex molecules.
  • Hence Catabolic and anabolic pathways are often coupled in the cell because the free energy released from one pathway is used to drive other.
  • So, the correct answer is 'the free energy released from one pathway is used to drive other'.