CBSE Class 10 Science Control and Coordination Assignment Set C

Question. One of the following acts as an endocrine gland as well as an exocrine gland. This one is :
(a) salivary gland
(b) pancreas
(c) pituitary
(d) parathyroid

Answer : B

Question. Which of the following helps in maintaining posture and balance of the human body ?
(a) cerebellum
(b) cerebrum
(c) medulla
(d) pons

Answer : A

Question. Which of the following is not an involuntary action ?
(a) vomiting
(b) chewing
(c) heart beat
(d) salivation

Answer : B

Question. Which of the following hormone prepares our body for action in emergency situations ?
(a) testosterone
(b) growth hormone
(c) adrenaline
(d) insulin

Answer : C

Question. One of the following controls the peristaltic movements of alimentary canal. This one is :
(a) cerebrum
(b) cerebellum
(c) pons
(d) medulla

Answer : D

Question. The hormone which is associated with male puberty is called :
(a) oestrogen
(b) adrenaline
(c) testosterone
(d) progesterone

Answer : C

Question. The number of pairs of nerves which arises from the spinal cord is :
(a) 21
(b) 31
(c) 41
(d) 51

Answer : B

Question. Cerbellum, medulla and pons are the parts of :
(a) mid-brain
(b) hind-brain
(c) forebrain
(d) spinal cord

Answer : B

Question. Which of the following are cerebral reflexes ?
(i) a person pulls away his hand on touching a hot object
(ii) a person spits out immediately when a fly enters his mouth while talking
(iii) A person walking bare foot lifts his foot at once on stepping on to a nail
(iv) A person’s pupil contracts at once in the presence of bright light
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (ii) and (iv)

Answer : D

Question. Iodine is necessary for the synthesis of which of the following hormone ?
(a) adrenaline
(b) auxin
(c) thyroxine
(d) insulin

Answer : C

Question. Which of the following is a mis-matched pair ?
(a) adrenaline : pituitary gland
(b) estrogen : ovary
(c) pancreas : insulin
(d) progesterone : ovary

Answer : A

Question. A cell (or group of cells) in a sense organ which is sensitive to a particular type of stimulus is called :
(a) interceptor
(b) effector
(c) receptor
(d) acceptor

Answer : C

Question. Which of the following cannot be considered a receptor ?
(a) ear
(b) nose
(c) muscle
(d) eye

Answer : C

Question. One of the following is an incorrect statement about insulin. This is :
(a) it is produced in pancreas
(b) it regulates growth and development of the body
(c) it regulates blood glucose level in the blood
(d) its deficiency in the body will cause diabetes

Answer : B

Question. The spinal cord orginates from :
(a) cerebrum
(b) cerebellum
(c) medulla
(d) pons

Answer : C

Question. The involuntary actions in the body are controlled by :
(a) medulla in forebrain
(b) medulla in hindbrain
(c) medulla in spinal cord
(d) medulla in midbrain

Answer : B

Question. The underactive endocrine gland which causes goitre is :
(a) pancreas
(b) thyroid
(c) adrenal
(d) pituitary

Answer : B 

Question. Which of the following endocrine gland does not occur as a pair in the human body ?
(a) adrenal
(b) pituitary
(c) testis
(d) ovary

Answer : B

Question. The junction between two adjacent neurons is called :
(a) nerve junction
(b) sensory junction
(c) synapse
(d) neuro-muscular joint

Answer : C

Question. The life processes in humans are controlled and regulated by :
(a) reproductive and endocrine systems
(b) respiratory and nervous systems
(c) endocrine and digestive systems
(d) nervous and endocrine systems

Answer : D

Question : How does the plant shoot bends, when the plant is placed in a room having only one open window? 

Answer : When the plant is placed in such a room that has only one open window, the shoot of the plant bends towards the direction of light. Plant hormone auxin is synthesized at the shoot tips,helps the cells to grow longer. When light is coming from one side of the plant, auxin diffuses towards the shady side of the shoot. This concentration of auxin stimulates the cells to grow longer on the side of the shoot which is away from light.

Thus, the plant appears to bend towards light while growing phototropism.

 

 

 

Question : Explain how the movement of leaves of a sensitive plant different from movements of shoots towards light? 

Answer :  Movements in Mimosa pudica (touch sensitive plant) occur in response to touch.

In such movements, plant cells change shape by changing the amount of water in them resulting in folding up and drooping of leaves. This phenomenon is called thigmonasty and this movement is independent of direction of stimuli.

Plants respond to a light by growing in or away from the direction of light, this is known as phototropism. Movement of shoots towards light indicates positive phototropism. 

Question :  A person suffered a head injury, due to which he faces breathing problem. No problem was detected with his respiratory system. What could be the cause of this problem? 

Answer :  As the problem is caused due to head injury, it could be related to “Pons” a part of Hind brain responsible for regulation of respiration.

Question :  A man becomes unconscious due to head injury. A pin is pricked on his foot, he withdraws his foot. Why? Explain. 

Answer :  It is reflex action. Stimulus is perceived by receptor (skin). Sensory nerve sends the sensation from receptor to the spinal cord. Then spinal cord sends the message through motor nerves to the effectors. Effectors i.e. muscles help in withdrawing his foot.

Question :  In a family of normal sized members, there are two exceptions, one member is dwarf and one is tall like “Khali”. What could be the cause of it?  

Answer :  In case of dwarfs, there is a deficiency of growth hormone from Pituitary gland and in case of giants excess of growth hormone is produced during childhood.

Question :  Why do you blink your eyes as bright light is focused on you? 

Answer :  We blink in order to protect the eye from bright light which otherwise would damage the retina.

Question :  There is a potted plant in your drawing room, after few days you note that plant has bent to one side. What could be the reason? How has this movement been cocoordinated?

Answer :  The plant has bent to one side due to phototropic movement of the stem. This movement is due to unequal growth of the stem on both sides. This growth is initiated by the hormone auxin.

Question :  A leaf shaped gland is present above the intestine. The secretion of this gland regulates the metabolism of sugar in blood. Name the secretion and gland.

Answer : The name of the gland is pancreas. The secretion is Insulin from special cells in it.