Tag: zoology

Quizzes (289) Questions (5869)

Questions Related to zoology

Multiple choice pleiotropy genetics zoology

Pleiotropic gene has

  1. Multiple genotype

  2. Single genotype

  3. Single phenotype

  4. Multiple phenotype
Reveal answer Fill a bubble to check yourself
D Correct answer
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’.

Multiple choice pleiotropy genetics zoology

Pleiotropic effect is found in

  1. Human skin colour

  2. Night blindness

  3. Haemophilia

  4. Sickle cell anaemia
Reveal answer Fill a bubble to check yourself
D Correct answer
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’.

Multiple choice pleiotropy genetics zoology

A pleiotropic gene is

  1. $I^A$
  2. $Hb^S$
  3. $Hb^A$
  4. $I^B$.
Reveal answer Fill a bubble to check yourself
B Correct answer
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’

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

For good reflex actions we require intact _____________.

  1. Spinal cord

  2. Medulla oblongata

  3. Hypothalamus

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

Reflex actions are rapid, involuntary responses to stimuli that are primarily processed by the spinal cord, allowing for a faster reaction time than if the signal had to travel to the brain.

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

Which of the following is not a reflex action?

  1. Salivation

  2. Sweating

  3. Withdrawal of hand when pinched by needle

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

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

  1. Biceps tendon reflex

  2. Knee jerk reflex

  3. Triceps tendon reflex

  4. Withdrawal reflex
Reveal answer Fill a bubble to check yourself
D Correct answer
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. 

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

Which one is correct about voluntary and involuntary movements?

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