Control and Coordination for Class 10 Science Important Questions

Control and Coordination For Class 10 Science Important Questions

Q 1 – The main function of abscisic acid in plants is 

(a) to promote cell division.

(b) to inhibit growth.

(c) to promote growth of stem.

(d) to increase the length of cells

 

(b) to inhibit growth.

Q 2 – A part of the body which responds to the instructions sent fromnervous system is called

(a) receptor

(b) effector

(c) nerves

(d) muscles

(b) effector

Q 3 – Which nerves transmit impulses from the central nervous system towards muscle cells? 

(a) Sensory nerves

(b) Motor nerves

(c) Relay nerves

(d) Cranial nerves

(b) Motor nerves

Q 4 –
Give the missing term.
(a) Spinal cord
(b) Brain
(c) Cranial nerves
(d) Relay nerves

(a) Spinal cord

Q 5 – Identify which of the following statements about thyroxin is incorrect?
(a) Thyroid gland requires iodine to synthesize thyroxin.
(b) Thyroxin is also called thyroid hormone.
(c) It regulates protein, carbohydrates and fat metabolism in the body.
(d) Iron is essential for the synthesis of thyroxin.

(a) Thyroid gland requires iodine to synthesize thyroxin.

Q 6 – The secretion of which hormone leads to physical changes in the body when you are 10-12 years of age?
(a) Oestrogen from testes and testosterone from ovar.
(b) Estrogen from adrenal gland and testosterone from pituitary gland.
(c) Testosterone from testes and estrogen from ovary.
(d) Testosterone from thyroid gland and estrogen from pituitary gland.

(c) Testosterone from testes and estrogen from ovary.

Q 7 – Which of the following statements are true?
(i) Sudden action in response to something in the environment is called reflex action
(ii) Sensory neurons carry signals from spinal cord to muscles
(iii) Motor neurons carry signals from receptors to spinal cord
(iv) The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc
(a) (i) and (ii)
(b) (i) and (iii)
(c) (i) and (iv)
(d) (i), (ii) and (iii)

(c) (i) and (iv)

Q 8 – Fill in the blanks.

  1.  Control and coordination are the functions of the nervous system and ……… in our body.
  2. The nervous system uses ……… impulses to transmit messages.
  3.  Central nervous system consists of ……… and ……… .
  4. Largest part of the brain is ………………..
  5. Deficiency of ……… hormone in childhood leads to dwarfism in humans.
  6. The growth of pollen tubes towards the ovules is the result of a ……… movement.
  7. The Hindbrain consists of three centres called ………………, ………………….. and ………………
  8. …………….. no. of pairs of nerves arise from the Spinal Cord .
  9. A microscopic gap between a pair of Adjacent neurons over which nerve impulses pass when going from one neuron to the next is known as ………………..
  10. The various sense organs are present in our body with special receptors. The Photoreceptors are present in ………………., Phonoreceptors are present in …………….., Olfactory receptors are present in ………………………., Olfactory receptors are present in ………………………., gustatory receptors are present in ………………………… and thermoreceptors are present in ………………………..
  1. hormones
  2. electrical
  3. brain, spinal cord
  4.  cerebrum
  5.  growth
  6. Chemotropic
  7. Pons, cons and medulla.
  8. 31
  9. Synapse
  10. eyes, inner ears, nose, tongue and skin

Q 9 – Match the following

 

Column I

Column II

(i) Thyroxin

(a) Puberty

(ii) Chemotropism

(b) Adrenaline

(ii) Body posture

(c) Tendril

(iv) Negative geotropism

(d) Gustatory

(v) Estrogen

(e) Goitre

(vi) Response to touch

(f) Cerebellum

(vii) Cell division

(g) Shoot system

(viii) Emergency situations

(h) Pollen tube

(ix) Taste

(i) Cytokinin

Column I

Column II

(i) Thyroxin

 (e) Goitre

(ii) Chemotropism

 (h) Pollen tube

(iii) Body posture

 (f) Cerebellum

(iv) Negative geotropism

 (g) Shoot system

(v) Estrogen

(a) Puberty

(vi) Response to touch

(c) Tendril

(vii) Cell division

(i) Cytokinin

(viii) Emergency situations

(b) Adrenaline

(ix) Taste

(d) Gustatory

Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true. 

Q 10. Assertion(A) : Insulin regulates blood sugar level.
Reason (R) : Sufficient secretion of insulin will cause diabetes.

 c) A is true but R is false.

Q 11. Assertion(A) : Animals can react to stimuli in different ways.
Reason (R) : All animals have a nervous system and an endocrine system involving hormones.

(a) Both A and R are true and R is the correct explanation of A.

Q 12. Assertion(A): A receptor is a specialized group of cells in a sense organ that perceive a particular type of stimulus.
Reason (R) : Different sense organs have different receptors for detecting stimuli.

(b) Both A and R are true but R is not the correct explanation of A.

 Q 13. Assertion(A) : The brain is also known as the central nervous system.
Reason (R) : Central nervous system controls and regulates the voluntary actions.

(d) A is false but R is true.

Q 14. Assertion(A) : The spinal nerves are 31 in number.
Reason (R) : Spinal nerves only have sensory neurons in them

(c) A is true but R is false.

Q 15 – Assertion (A) – Senescence can be delayed in plants by applying cytokinin.

Reason (R) – Cytokinin prevents breakdown of chlorophyll, proteins and so on

(a) Both A and R are true and R is the correct explanation of A.

Q 16 – Assertion(A) – A nerve impulse is an electrochemical event.

Reason(R)- In a nerve impulse there are changes in the resting potential which spreads down the nerve fibre.

(a) Both A and R are true and R is the correct explanation of A.

Q 17 – What is Thigmonatism . Explain the working of ‘Touch me not’ plant  ?

Q 18 – How the electrical impulse travels through the gap (synapse) between the two neurons ?

Transmission of nerve impulses between two neurons takes place through the synapse. At the end of the axon, the electrical impulse sets off the release of some chemicals (neurotransmitters). These chemicals cross the gap or synapse and start a similar electrical impulse in the dendrite of the next neuron.

Q 19 – What are Cerebral reflexes . Explain with an example ?  

Cerebral reflexes

  1. Reflexes that involved the brain are known as cerebral reflexes.
  2. These are involuntary and almost instantaneous responses to the stimulus.
  3. Cerebral reflexes usually occur in the organs which are directly connected to the brain.
  4. Examples of cerebral reflexes are the Closing of eyes when it gets exposed to brighter light and this reflex protects the eyes.

Q 20 – Name the glands that act as both Exocrine as well as Endocrine systems and how do they act in that way ?      

Q 21 – Name the fluid present in Meninges of brain and also mention the functions of Mid Brain ?

Q 22 – Why plants cannot respond quickly and Animals can respond quickly ?

Q 23 – What is the Function of progesterone ?

The main function of progesterone is to prepare the endometrium (lining of your uterus) for a fertilized egg to implant and grow. If a pregnancy doesn’t occur, the endometrium sheds during your menstrual period. If conception occurs, progesterone increases to support the pregnancy

Q 24 – What are the functions of plant hormones ?

Control all the growth and development activities like cell division, enlargement, flowering, seed formation, dormancy and abscission

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