Science exemplar problems class 10 Solutions for Chapter 6 control and coordination

Read the given statements and choose the correct option:

STATEMENT A: Increased level of blood glucose causes the release of insulin which then lowers the blood sugar levels.

STATEMENT B: This process is regulated by a negative feedback mechanism.

Complete the following sentence:

In a synapse, chemical signal is transmitted from ………………………………………………………………………………………

From which of the following parts of the neuron chemical substances called neurotransmitters are released?

Which of the following options give the correct pathway in which a nerve impulse is transmitted during a relex action?

Observe the image of the human brain shown below:

Which of the following part of the brain consist of cerebellum?

Which of the following is the main function of abscisic acid in plants?

The image below shows a disorder caused due to the deficiency of iodine:

Which is the name of this disorder?

Which of the following phytohormone promotes cell division in fruits?

The shape of guard cells changes in response to the concentration of water. This type of movement is called ……………………………….

(hydrotropism/thermotropism)

In the image shown below, the tendril of the pea plant grows with the help of the support of the rod.

This growth in the pea tendril is due to which of the following movements?

Assertion (A): The pollen tubes grows towards the ovary.

Reason (R): The growth of the pollen tube towards ovary is due to chemotropism.

The image given below shows the movement of the roots towards water:

This growth of roots towards the direction of water is called ……………………………………

(hydrotropism/chemotropism)

Which of the following phytohormone causes shedding of leaves?

The bony-box which forms a tough outer covering around the brain and protects it from any damage is called ……………………

Which of the following statements is/are incorrect about transmission of nerve impulse?

Complete the following sentence:

When a person is suffering from severe cold, he or she cannot differentiate …………………………………………………………………………..

Which of the following statements is correct about receptors?

Which of the following leads to dwarfism?

Which statement is not true about thyroxin?

Which of the following hormone bring about distinct physical changes in girls and boys during puberty?

The ……………………………… is called as the master gland of the body. It releases the thyroid stimulating hormone (TSH).

What is the junction between two neurons called?

Complete the following sentense:

In humans, the life processes are controlled and regulated by ……………………………..

Rise in the blood glucose level is regulated by which of the following hormone?

Which of the following statements are true about the brain?

(i) The main thinking part of the brain is the hind-brain.

(ii) The sensory inputs of sight and audio are received by the midbrain and processed by the forebrain

(iii) Involuntary actions like heartbeat , salivation, vomiting are controlled by the medulla oblongata present in the hind-brain.

(iv) Cerebellum does not control posture and balance of the body.

Which of the following depicts the correct direction of flow of electrical impulses through the neurons?

The spinal cord arises from which of the following parts?

Identify the given statement as TRUE or FALSE:

Sudden, quick, and involuntary actions in response to a stimulus is called reflex action.

Observe the image of the neuron given below:

Which of the following part of the neuron is called the AXON?

Assertion (A): The hypothalamus secretes growth hormone (GH).

Reason (R): Deficiency of growth hormone (GH) causes dwarfism.

The table given below states the name of the receptor and the organ where they are present.

Which of the following option gives the correctly matched receptor and their organs?

The image given below shows the opening and closing of the leaves due to light:

This movement in the leaves is called …………………………….. movement.

(Photonastic/Chemotropic)

After walking for long time under sun, a person feels thirsty. Which of the following part of the brain consist of centers that signals this thirst?

X is a fluid that is present between the meninges of the brain and spinal cord. X functions as a shock absorber.

Identify X.

The optic nerve is a type of X nerve that on the stimulus of sight transmits a signal to the Y.

Identify X and Y.

While crossing road, Mohini observes a truck approaching her. Her fight and flight response activates and she runs and crosses the road. After some time she relaxes and walks peacefully.

Which nervous system helped to relax?

The image below depicts an endocrine gland:

Which of the following statements are TRUE with respect to the endocrine gland shown in the image?

Choose all that apply.

Assertion (A): While playing cricket when a fielder sees a ball approaching herself, her heartbeat increases.

Reason (R): The parasympathetic nervous system prepares the body for fight and flight response.

Involuntary actions in the body are controlled by ……………………………

Identify!

A are the type of nerves that arise from the brain and form a part of the peripheral nervous system.

Identify A.

Which of the following statements are true about the brain?

(i) Forebrain: Helps in thinking.

(ii) Forebrain: Does not help with sensory inputs of sight and audio.

(iii) Cerebellum: Maintains posture and balance of the body.

(iv) Cerebellum: Does not control posture and balance of the body.

Observe the diagram shown below:

Which of the following options correctly depict the labels in the given image?

‘X’ is a plant hormone that is present in the root and shoot tips. It is majorly responsible for apical dominance. Identify ‘X’.

Assertion (A): The elongation of stems increases the length of the plants.

Reason (R): Gibberellins bring about elongation of the stem.

The image given below shows the endocrine glands present in the body:

Which of the following options give the CORRECT names of these endocrine glands?

Observe the image of the plants given below:

Which of the following plant is showing positive phototropism and positive geotropism respectively?

Observe the image of the neuron shown below:

Which of the following label points on the dendrite?

Identify the given statement as TRUE or FALSE:

The directional growth movement of a plant in response to an external stimulus is called tropic movement.

State TRUE or FALSE:

Low intake of iodine can lead to a deficiency disoredr called goitre.

The specialized dendritic end of the nerve cell which receives the neurotransmitter and sets off an electrical impulse which then travels through the cell body is called……………………………….

(receptor/ synapse)

The gap between the terminal end of a nerve and muscle is called …………………………….. junction.

Which of the following is an example of reflex action?

Assertion (A): The dendritic ends consist of the receptors which receive the impulse from the neuron.

Reason (R): The impulse is then converted into an electrical signal which then travels through the cell body and reaches the axonal end.

Deficiency of which of the following hormone causes a rise in the blood sugar level?

The image given below shows the endocrine glands present in females:

Which of the following glands is present ABOVE the organ labelled as A?

The image given below shows the endocrine glands present in females:

Name the gland labelled as A?

Which of the following endocrine gland is present in males but not in females?

Which of the following endocrine gland is present above each kidney?

State TRUE or FALSE:

Function of neuron is to process and transmit information from brain to all parts of the body.

Which of the following part of the brain receives sensory impulses from various receptors?

The image below shows the shoot of the plant bending towards the stimulus of light:

This movement occurs due to the increase in the concentration of the hormone ‘X’ in the shady region. What is the name of this plant hormone?

State TRUE or FALSE:

Adrenaline is responsible for the growth and regulation of the body.

Which of the following hormone regulates the metabolic processes like carbohydrate, fat, and protein metabolism in the body?

State TRUE or FALSE:

Testosterone is responsible for the expression of secondary sexual characters in females.

Which of the following hormone is also called the fight and flight hormone?

The movement shown in plants in response to a chemical stimuli is called ……………………………………………

State TRUE or FALSE:

Moving your hand away from a hot iron plate is an example of reflex action.

State TRUE or FALSE:

When light acts as a stimulus, the pupil of the eye changes in size is an example of reflex action.

The organ system which controls and coordinates the responses of the body to different stimuli is called ………………………….. system.

State TRUE or FALSE:

Chemical cordination takes place in organisms with the help of hormone.

State TRUE or FALSE:

The flow of signals in a synapse occurs from the axonal end of one neuron to the dendritic end of another neuron but not the reverse.