Tag: zoology

Questions Related to zoology

Pleiotropic gene has

pleiotropy genetics zoology

  1. Multiple genotype

  2. Single genotype

  3. Single phenotype

  4. Multiple phenotype

Show answer
Correct Option: D
Explanation:

The ability of a gene to have multiple phenotypic effects or as it influences a number of characters simultaneously is pleiotrophy and the genes are called Pleiotropic genes.

So, the correct option ‘Multiple phenotypes’.

Pleiotropic effect is found in

pleiotropy genetics zoology

  1. Human skin colour

  2. Night blindness

  3. Haemophilia

  4. Sickle cell anaemia

Show answer
Correct Option: D
Explanation:

The ability of a gene to have a multiple phenotypic effects is known as pleiotrophy and the gene is called Pleiotropic gene and the inheritance is called Pleiotropic inheritance.

eg:Sickel cell anaemia

So, the correct option is ‘sickle cell anaemia’.

A pleiotropic gene is

pleiotropy genetics zoology

  1. $I^A$

  2. $Hb^S$

  3. $Hb^A$

  4. $I^B$.

Show answer
Correct Option: B
Explanation:

The gene having multiple phenotypic effects is called pleiotropic genes. Eg: Sickel cell anaemia. This is caused by a gene HbS. When it is a homozygous condition, sickle cell anaemia occurs or if it is in the homozygous condition, act as a carrier.

So, the correct option is 'HbS’

For good reflex actions we require intact _____________.

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Spinal cord

  2. Medulla oblongata

  3. Hypothalamus

  4. Cerebellum

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Correct Option: A

Which of the following is not a reflex action?

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Salivation

  2. Sweating

  3. Withdrawal of hand when pinched by needle

  4. None of these

Show answer
Correct Option: B
Explanation:

An automatic (involuntary) neuromuscular action excited by a defined stimulus is called reflex action. Sweating is not a reflex action. It is primarily a means of temperature regulation. But, Salivation and hand withdrawal because of the needle both are reflex actions.

Classify the following into reflex action and in voluntary actions of brain.

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Beating of heart

  2. Withdrawing your hand inmediately on touching a hot object

  3. Change in size of pupil in response to intensity of light

  4. Riding a bicycle

  5. Sneezing

  6. pulling up the leg immediately when foot falls on some sharp object.

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Correct Option: A

Reflex action is the function of brain stem.

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. True

  2. False

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Correct Option: A

The direction of against stimulus response is opposite in which of the following reflex action?

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Biceps tendon reflex

  2. Knee jerk reflex

  3. Triceps tendon reflex

  4. Withdrawal reflex

Show answer
Correct Option: D
Explanation:

Option 'D' is correct


Withdrawal reflex is the reflex that involves the withdrawal is response to stimulus. It is also known as pair withdrawal reflex. When pair receptors are stimulated, reciprocal innervation stimulate the flexons to withdrawal and inhibit the extensors. 

Which one is not a reflex action?

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Closing the eye lids suddenly

  2. Release of saliva

  3. Obeying the order

  4. Pupillary constriction

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Correct Option: A

Which one is correct about voluntary and involuntary movements?

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Voluntary movements- caused by skeletal muscle, Involuntary movements- caused by smooth muscle

  2. Voluntary movements- caused by smooth muscle, Involuntary movements- caused by skeletal muscle

  3. Voluntary movements- controlled by brain, Involuntary movements- controlled by organs

  4. Voluntary movements- controlled by organs, Involuntary movements- controlled by brain

Show answer
Correct Option: A
Explanation:

Voluntary movements are movements that are in direct control of the will of a person. These are controlled by skeletal muscles. For example walking, talking, dancing, etc. Involuntary movements are movements that are not in control of a person. They are generated by smooth striated muscle. For example, heart pumping, digestion, etc.