Angel International School - Manipay 1 st Term Examination November, 2015

Transcription

1 Grade 10 Angel International School - Manipay 1 st Term Examination November, 2015 Biology Duration: 3.00 Hours Part 1 Index No:- Choose the correct or most appropriate answer and underline them 1) When a person is frightened, which substance increases the blood sugar levels? a) Adrenaline b) Amylase 2) Which of the following is an example of excretion? a) Release of insulin from the pancreas b) Release of saliva from the salivary gland c) Removal of faeces from the alimentary canal d) Removal of carbon dioxide from the lungs c) Glycogen d) Insulin 3) Which response to overcooling does not involve muscle contraction? a) Blood vessels narrowing b) Hairs standing up c) Shivering d) Reduced sweating 4) Diagram 1 shows the iris and pupil of person s eye. Diagram 2 shows the eye after a change in external conditions. Which changes coursed this response? a) A decrease in light intensity b) An increase in light intensity c) Focusing on a distant object d) Focusing on a nearby object 5) In kidney machine, which of the following passes from the blood to the dialysis fluid? a) Glucose b) Plasma protein 6) Which type of cell stimulates the release of adrenaline? a) Motor nerve cell b) Muscle cell c) Red blood cells d) Urea c) Pancreatic cell d) Red blood cell 7) The flow diagram shows the pupil reflex. x x Bright light falls on Information travels retina along.. neurons to brain neurons to brain z Information y Y send from brain to muscles of the. Circular muscles respond by.. Diameter of pupil decreases 1

2 Which words complete the follow diagram? X Y Z A Motor neuron Ciliary body Contracting B Motor neuron iris relaxing C Sensory neuron Ciliary body relaxing D Sensory neuron iris contracting 8) The diagram shows a section through a human eye. Which structure contains muscle fibers that contract in response to sudden changes in light intensity? a) Suspensary ligament c) ciliary muscle b) Iris d) lens 9) The diagram shows a section of the spinal cord. Which identifies the neurons of the reflex arc shown? MOTER RELAY SENSORY A B C D ) The diagram shows a section through the brain. Which regions control balance, heart rate and temperature? Balance heart rate temperature A W Z Y B X Y Z C Y X W D Z W Y 11) In a nerve pathway, the following events take place i) Activation of muscle ii) Activation of receptor iii) Passage of impulses along a motor neurons iv) Passage of impulses along a sensory neurons What is the correct order of these events? First last a) b) c) d)

3 12) Which is most important androgen? a) Testosterone b) Progesterone c) Estrogen d) None of the above 13) Which of the following statements are wrong? i) Ovulation is part of the menstrual cycle ii) Progesterone secretes before ovulation iii) A follicle secretes estrogen iv) Follicle develops inside an ovary v) Menstrual cycle is controlled by hormone a) i and ii b) ii only c) iii and v d) iii only 15) Which hormone involves the shoot to short bends towards the light? a) Auxin c) Insulin b) Ethane d) Glycogens 16) Which diagram shows how light from a distant object is focused on the retina to from a clear image? a) b) c) d) 17) Which is responsible for colour of skin? a) Melanin b) Sebum c) Keratin d) Cornitier layer 18) What are the three main excretory substances in human? a) Carbon dioxide, bile pigment, urea c) Sweat, faeces, saliva b) Carbon dioxide, sweat, urine d) All off the above 19) The diagram shows part of the nervous system including reflex arc. It has been cut at diagram. A bee stings a finger, as shown. What are the effects of this sting? Pain felt arm moved a) No no b) No yes c) Yes no d) Yes yes 20) Which part of the plant show positive geotropism? a) Root b) Shoot c) Seed d) Stem 3

4 21) Quantities in the climateric phase of fruit ripening. a) Auxin c) Cytokinin b) Abscisis acid d) Ethylene 22)..regulates stem elongations in young grass seedling and most herb. a) Auxin b) Gibberellins c) Cytokinin d) Ethylene 23) Where is urea made in human body? a) Liver b) Kidneys c) Pancreas d) Small intestine 24) A person walks in to very cold room. Shortly afterwards the hairs on theirs on their skin are raised. Which labeled structure is included in the first stage of this reflex? 25) Which of these in not a normal constituent of urine? a) Urea b) Sugar c) Creatinine d) Water 26) Which of these is not an excretory organ? a) Intestine b) Lungs c) Thyroid d) Kidney 27) Which of these is not a function of kidney? a) Maintenances of acid base balance b) Excretion of nitrogenous waste products c) Temperature regulation d) Maintenance of water balance 28) The diagram shows some nerve pathways involved in temperature control of the human body. 4

5 Which part of the nervous system does X represent? a) Cerebrum b) Hypothalamus c) Medulla d) Pituitary gland 29) The graph shows how the diameter of the pupil of a person s eye changed during the course of two minutes. What happens to the light intensity at X and which muscles begin to contract? Light intensity Iris muscles contracting A Decrease Circular muscle B Decrease radial muscle C Increase Circular muscle D increase radial muscle 30) Which of the following is not a function of the skin? a) Holding the organs b) Temperature regulation c) Protection d) Sensing stimuli 31) The diagram shows the front part of an eye. Which changes take place in the eye when a person looks up from reading a book to view a distant object? a) Ciliary muscle lens b) Contracts become thicker c) Contracts become thinner d) Relaxes become thicker e) Relaxes become thinner 32) The function of melanin in the skin is to a) Cause cancer b) Give the skin a nice cooler c) Protect underlying layers from the harmful rays of the sun d) Make the skin tough 5

6 33) Sebaceous gland secrete.. a) Sweat b) Milk 34) Keratin deposited in the epidermal cells a) Makes it stronger b) Gives it colour c) Oils d) Scent c) Makes it water proof d) Makes it flexible 35) The diagram shows skin temperature of a human when exposed to warm air and then exposed to cold air. When causes the observed change in skin temperature on exposure to cold air? a) Less blood flowing just below the skin b) Less blood going to the heart and lungs c) More blood flowing just below the skin d) More blood going to the heart and lungs 36) Which vitamin is produced in the skin in sunlight? a) Vitamin-D b) Vitamin-B12 c) Vitamin- C d) Vitamin-E 37) Which of the following are not important in temperature regulation of the body? i. Sebaceous glands produce oil for water proofing and protecting the hairs ii. Smooth muscles around capillaries iii. Shivering iv. Sebaceous glands v. Sweet gland a) i only b) iii and v only c) iii and iv only d) iii only 38) The diagram showed a cross section of the spinal cord of a mammal. Which region contains the axons (fibers) of motor neurons, but not those of sensory neurons? a) A b) B c) C d) D 6

7 39) Which part of the brain co-ordinates the information labeled in the diagram? a) Cerebrum b) Hypothalamus c) Cerebellum d) Medulla 40) The diagram shows the flow of blood and dialysis fluid through a kidney machine. Where would the concentration of urea be highest? a) W and x b) Y and z c) X and y d) Z and w (40 Marks) 7

8 Part 2 1) 2) a) Explain how the skin is involved in returning the body temperature to normal when the body over heats. In your answer you should mention the part done by arteriole and capillaries. b) Explain why temperature control is regarded as an example of a negative feedback system (10marks) a) Explain how in a healthy person i) The body temperature ii) The blood sugar are returned to normal after they have risen above normal levels b) Explain why it is important for man to maintain a constant body temperature of 37 C. (10marks) 3) Explain how named excretory substances in blood are removal by i) The lungs ii) The kidneys iii) The skin (8) b) Explain why the loss of oxygen from a leaf of a plant may be described as excretion. (2) (10marks) 4) Below diagram shows a section through an eye of a person who is focusing on a distant object. A B a) Name the structures labeled U to X. (2) b) On the diagram continue the light rays in to the eye to show how a focused image is produced on the retina. (2) c) Identify the parts labeled A and B. (2) d) A student wrote Massages past allow structure B. i) State the correct term for this massage. (1) ii) State the organ term which these massages are carried. (1) e) The table contains statement which describes some of the changes in the Eye when a person looks closely at the book after looking distant object. Using the No 1 to 4 indicate the correct sequence of these changes starting from when the Eye focused on the distance object Lens is thick Suspensory ligaments slacken Lens in thick Ciliary muscles contract (2) (10 Marks) 8

9 5) a) Describe the part played in reflex actions by i) Sensory neurons, ii) Motor neurons and iii) Relay neurons. (6) b) Describe how a reflect actions differs from a deliberate actions. (4) c) Draw the mylinated motor neuron and label it. (5) (15marks) Choose only one from here. 6) Use this chart and label the below diagram. Part of function brain P Controls body temperature Q R S T Is the master hormone producer Controls unconscious activities such as heart- beat Helps to control balance and gives coordination Memory storage and conscious behaviour (5 marks) 7) a) Which blood vessels bring blood to the kidney? (1) b) What is urine? (2) c) What do u meant by deamination? (1) d) Why urea is called a nitrogenous excretory product? (1) (5marks) 9

10 8) a) The body is able to maintain its internal environment within narrow limits. State the term for this process. (1) b) Structure C and D in diagram, are involved in the process of temperature regulation. Identify the structures C and D and state the part they play in the process. (4) (5 marks) ***** 10