CBSE Class 10 Science Control and Coordination Assignment Set C

Read and download free pdf of CBSE Class 10 Science Control and Coordination Assignment Set C. Get printable school Assignments for Class 10 Science. Standard 10 students should practise questions and answers given here for Chapter 7 Control And Coordination Science in Grade 10 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 10 Science prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations

Assignment for Class 10 Science Chapter 7 Control And Coordination

Class 10 Science students should refer to the following printable assignment in Pdf for Chapter 7 Control And Coordination in standard 10. This test paper with questions and answers for Grade 10 Science will be very useful for exams and help you to score good marks

Chapter 7 Control And Coordination Class 10 Science Assignment

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 : Four lobed endocrine gland is 
a. Pituitary
b. Adrenal gland
c. Parathyroid gland
d. None of these
Answer : C
Explanation: Parathyroid gland is four lobed,this gland is present in the neck region. 
Question : Select the mis-matched pair 
a. Estrogen - Ovary
b. Testosterone - Testes
c. Adrenaline - Pituitary gland
d. Thyroxin - Thyroid gland
Answer : C
Explanation: Adrenaline hormone is not released form pituitary gland. It is released by adrenal gland. 
Question : Which hormone brings the development of mammary gland? 
a. Relaxin
b. Estrogen
c. Oxytocin
d. Progesterone
Answer : B
Explanation: Estrogen hormone released from pituitary gland to help in the development of mammary gland to feed the young ones.
Question : Spinal cord is enclosed in bony cage called ? 
a. Diaphragm
b. Vertebral column
c. Cranium
d. Ribs
Answer : B
Explanation: spinal cord is protected by a bony structure called vertebral column, it present in dorsal surface.
Question :Which of the following statement are correct about glands? 
A. All glands are ductless
B. Pancreas is a mixed gland
C. Glands are specific in their action
D. Endocrine glands are ductless
a. B and D
b. All of these
c. B and C
d. A and C
Answer : C
Explanation: Pancreas is known as a mixed gland because it performs functions of both exocrine and endocrine glands; and Most hormones produce an effect on specific target tissues that are sited at some distance from the gland secreting the hormone.

Very Short Answer

Question : Name the part of the pituitary gland which controls growth and development of gonads.
Answer : Anterior lobe (Adenohypophysis) controls growth and development of gonads.
Question : Name the part of neuron 
(a) where information is acquired.
(b) through which information travels as an electrical impulse.
Answer : (a) Dendrite of cell body.
(b) Axon
Question : In which part adrenaline is produced?
Answer : Adrenaline is produced in adrenal gland.
Question : Write name of gonadotropic hormones. 
Answer : Follicular Simulating Hormone (FSH), Luteinising Hormone (LH) and Luteotropic Hormone (LTH) are gonadotropic hormones

Short Answer

Question : How endocrine glands do helps in maintaining feedback control?
Answer : The timing and amount of hormones released are regulated by feedback mechanism. 
For example, glucose level in the blood is maintained constant. The blood glucose levels may be maintained constantly by either of the following feedback mechanism.
1. High glucose level in the blood induces the pancreatic cells to produce insulin which converts glucose to glycogen.
2. Less glucose level in the blood do not induce the pancreateic cells to produce insulin so that less conversion of glucose to glycogen may occur.
Question : What are the physiological effects of gibberellins? 
Answer : Physiological effects of gibberelline are:
i. Elongation of stem and expansion of leaf.
ii. Reversal of Dwarfism particularly in corn.
iii. Parthenocarpy.
iv. Breaking of seed and bud dormancy.
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. 

Long Answer 

Question : What are hormones? State their role in the working of the human body.Or Define 'Hormone'. What are the general functions of 'hormones'? 
Answer : Selye in 1948 defined hormones as "Physiological and organic compounds produced by certain cells (endocrine glands) for the sole purpose of directing the activities of distant parts of the same organism." They are also referred to as "chemical messengers". They have excitatory effects on some organs and inhibitory effects on others.
Functions of hormones:
i. Hormones stimulate the tissue activity.
ii. Hormones regulate growth and reproduction.
iii. Hormones control metabolism.
iv. Hormones synthesize, store and utilize substances like glucose.
v. Hormones conserve water and minerals.
Question : 'Nervous and hormonal systems together perform the function of control and coordination in human beings.' Justify the statement. 
Answer : The working together of various organs of human being in a systematic, controlled and efficient way to produce a proper response to various stimuli is known as coordination.
In human beings, the control and coordination is brought about by both nervous system and endocrine system. Nervous system consists of receptors that receive the stimulus from surrounding environment and send the message received by them to the spinal cord and brain in form of electrical impulses through the sensory nerves. The motor nerves then transmit the response to the effector. The effectors are mainly the muscles and glands of our body. Thus, endocrine glands secreting hormones are directly or indirectly controlled by the nervous system. For example, when an emergency stimulus is detected by the nervous system, the stimulus is detected by the nervous system , the stimulus is received and analysed by central nervous system that send message to effectors to provide proper response. At the same time, the sympathetic nervous system activates adrenal gland to release adrenaline that prepares body by increasing heart rate, blood pressure,respiration and dilates pupil etc.
Hence, control and coordination in humans (or animals) depend on two things for transmitting information, i.e. chemical signals of hormones and nerve impulses. If they depended only on nerve impulses through nerve cells, only a limited range of tissues would be stimulated. Since, they get additional chemical signals as well, a large number of tissues are stimulated. This is why animals can show a wide range of response to stimulus.

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.

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