laboursonline – MCQs, Mock Tests | Biology Biology MCQ Question

It is the measure of force with which blood pushes up against the walls of blood vessels.

1. Stroke volume
2. Cardiac output
3. Blood pressure
4. Blood flow

✅ Correct Answer: 3

All of the follwing are blood clots except

1. Thrombus
2. Embolus
3. Atheroma
4. Hematoma

✅ Correct Answer: 3

It is the discharge of blood from blood vessels.

1. Myocardial infarction
2. Cerebral infarction
3. Cerebral Hemorrhage
4. Thromboembolism

✅ Correct Answer: 3

The flow of lymph is maintained by

1. Movement of viscera
2. Breathing movements
3. Valves
4. All of these

✅ Correct Answer: 4

Introduction of vaccine within the body to produce immunity is an example of

1. Artificially induced active immunity
2. Naturally induced active immunity
3. Artificially induced passive immunity
4. Naturally induced passive immunity

✅ Correct Answer: 1

Chlorosis, i.e., yellowish hue on the leaves results from

1. Accumulation of toxic waste products in leaves.
2. Deficiency of chlorophyll.
3. Short supplies of mineral nutrients in the soil.
4. All of these

✅ Correct Answer: 4

Chemically auxins are

1. Indole propionic acid.
2. Indole carboxylic acid.
3. Indole acetaldehyde
4. Indole acetic acid.

✅ Correct Answer: 4

Gibberellins may be substituted for _____ light, therefore promote flowering in long day plants.

1. White
2. Red
3. Blue
4. Green

✅ Correct Answer: 2

Which of the following is antagonist to Auxin in terms of promotion of stem growth?

1. Gibberellins
2. Cytokinins
3. Abscisic Acid
4. none of these.

✅ Correct Answer: 3

Abscisic acid promotes flowering in short day plants and inhibits in long day plants, which of the following is antagonistic to abscisic acid in terms of flowering:

1. Gibberellins
2. Cytokinins
3. Auxins
4. Ethene.

✅ Correct Answer: 1

The only promoter of leaf senescence in the following plant hormones is:

1. Gibberellins
2. Cytokinins
3. Auxins
4. Abscisic Acid

✅ Correct Answer: 4

Which of the following is used in brewing industry to promote malting:

1. Gibberellins
2. Cytokinins
3. Auxins
4. Abscisic Acid

✅ Correct Answer: 1

Which type of the receptors are present in the ear?

1. Chemoreceptors
2. Mechanoreceptors
3. Photoreceptors
4. Thermoreceptors

✅ Correct Answer: 2

Type of sensations carried by nociceptors are:

1. Touch
2. Temperature
3. Pressure.
4. Pain

✅ Correct Answer: 4

Which of the following statement about neuron is incorrect?

1. They not only conduct impulses but also generate them.
2. They are not the only cellular component of nervous system.
3. They may show limited regenerative capabilities.
4. Like all the living cell, when they mature and divide to form similar cells.

✅ Correct Answer: 4

Type of neurons found exclusively in CNS are:

1. Sensory neurons
2. Motor neurons
3. Associative neurons
4. None of these.

✅ Correct Answer: 3

Maintenance of normal resting potential via movement of K+ inside the cell and na+ out is a/an _______ process.

1. Active
2. Passive
3. Diffusional
4. None of these.

✅ Correct Answer: 1

Cell membrane under resting conditions is impermeable to all the ions except

1. Na+
2. K+
3. Cl-
4. PO4-2

✅ Correct Answer: 2

At the induction of action potential opening of Na+ gate with influx of Na+ is a _________ processes:

1. Active transport.
2. Passive transport.
3. Diffusion
4. none of these.

✅ Correct Answer: 2

Normal resting membrane potential of a neuron is

1. ? 50 mv
2. ? 60 mv
3. ? 70 mv
4. ? 80 mv

✅ Correct Answer: 3

Normal action potential of a neuronal cell is :

1. plus 50 mv
2. plus 60 mv
3. plus 70 mv
4. plus 80 mv

✅ Correct Answer: 1

Na+ -K+ ATPase pump is important for:

1. Maintenance of resting potential.
2. Massive out flux of K+ after depolarization.
3. Recovery of resting potential.
4. Conversion of resting potential into action potential.

✅ Correct Answer: 3

Maximum speed of nerve impulse transmission is

1. 100 m/sec
2. 110 m/sec
3. 120m/sec
4. 130 m/sec.

✅ Correct Answer: 3

Which of the following has no central nervous system?

1. Hydra
2. Man
3. Planaria
4. Cockroach

✅ Correct Answer: 1

Co-ordination results in

1. Regulation of body functions
2. Organization of body functions
3. Integration of body functions
4. All of these

✅ Correct Answer: 4

Which of the following are responsible for the detection of changes in environment?

1. Receptors
2. Neurons
3. Effectors
4. All of these

✅ Correct Answer: 1

Any change in the environment of an organism is called

1. Stimulus
2. Variation
3. Response
4. Reaction

✅ Correct Answer: 1

Hydra has

1. Brain
2. Nerves
3. Neuron-cells
4. All of these

✅ Correct Answer: 3

Which of the followings is missing from the nervous system of planaria?

1. Ganglia
2. Longitudinal nerves
3. Lateral nerves
4. none of these.

✅ Correct Answer: 4

Co-ordination in man is brought about by

1. Nervous system
2. Endocrine system
3. Both of these
4. none of these.

✅ Correct Answer: 3

Which of the following transmits nerve impulse from receptors to central nervous system?

1. Sensory neuron
2. Motor neuron
3. Associative neuron
4. none of these.

✅ Correct Answer: 1

In which of the following neurons length of dendrite is greater than axon?

1. Sensory neuron
2. Motor neuron
3. Associative neuron
4. none of these.

✅ Correct Answer: 1

Which of the following neuron has a single long dendron?

1. Sensory neuron
2. Motor neuron
3. Associative neuron
4. none of these.

✅ Correct Answer: 1

Which of the following cytoplasmic extensions carry the message toward the cell body?

1. Dendrites
2. Axon
3. Both of these
4. none of these.

✅ Correct Answer: 1

Microscopic gaps between the neuron endings are called

1. Transmitters
2. Synapses
3. Pores
4. Nodes

✅ Correct Answer: 2

What is the function of synapse?

1. To allow nerve impulse to move in backward direction
2. To decrease the speed of nerve impulse
3. To stop the nerve impulse
4. To provide cytoplasmic connection between neurons.

✅ Correct Answer: 2

Under resting membrane potentials

1. Outer surface of neuron is more positive
2. Inner surface of neuron is more positive
3. Both of these surfaces are equally positive
4. none of these.

✅ Correct Answer: 1

Which of the following ions are involved in the initiation of nerve impulse

1. Na+
2. K+
3. Fe
4. none of these.

✅ Correct Answer: 1

Reflex actions below the neck are under control of

1. Brain
2. Spinal cord
3. Hypothalamus
4. none of these.

✅ Correct Answer: 2

Central nervous system of man consists of

1. Brain
2. Spinal cord
3. Both of these
4. none of these.

✅ Correct Answer: 3

Which of the following is largest part of brain

1. Cerebrum
2. Cerebellum
3. Medulla oblongata
4. Thalamus

✅ Correct Answer: 1

Which of the following is present inside the vertebral column

1. Brain
2. Spinal cord
3. Both of these
4. none of these.

✅ Correct Answer: 2

Intelligence is under the control of

1. Cerebrum
2. Cerebellum
3. Thalamus
4. Hypothalamus

✅ Correct Answer: 1

Which of the following is second largest part of the brain?

1. Cerebrum
2. Cerebellum
3. Thalamus
4. Hypothalamus

✅ Correct Answer: 2

Which of the following acts as thermoregulator?

1. Cerebrum
2. Cerebellum
3. Thalamus
4. Hypothalamus

✅ Correct Answer: 4

Which of the following allows precise muscular movements?

1. Cerebrum
2. Cerebellum
3. Thalamus
4. Hypothalamus

✅ Correct Answer: 2

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Biology MCQ Question - Coordination and Control