Holidays Home Work Summer Break 2018 Class X A Subject

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a Label the parts of this neuron 8,b name of the neuron 1. a Label the parts of this neuron 5,b name of the neuron 1. a Describe how impulse is transmitted from one neuron to another neuron. Q10 Define the term voluntary and involuntary actions. Q11 Explain the reflex arc for the cranial and spinal reflex. Q12 Explain the reaction for the voluntary action how the impulse travels. a Receptors receive stimuli and convert them into electrical impulses Fig 2 1 shows the pathway. taken by electrical impulses in a reflex action Complete Fig 2 1 by writing the name of the. appropriate component on the dotted lines, a Describe how voluntary actions differ from involuntary actions. A person is stung on the hand by an insect and automatically withdraws their hand rapidly. a Describe the part played by the nervous system in this action. a For each of the following state where in the reflex arc they are found and state their functions. sensory neuron,relay neurons,motor neuron, b Explain why just after hearing a sudden loud noise a person s heart beats faster. i Name the type of nerve cell shown in Fig, ii State two features that distinguish it from other types of nerve cell.
iii Where in the nervous system is this cell located. b Nerve cells are specialized cells Suggest how the parts of the nerve cell labeled in Fig 2 1 enable the nerve. cell to function successfully,Myelin sheath,c Reflexes involve a response to a stimulus. i Complete the flow chart by putting the following terms in the boxes to show the correct sequence in a reflex. Coordinator effectors receptor response stimulus, a Complete Table by naming three sense organs and the stimulus which each detects. b Reflexes are involuntary actions coordinated by reflex arcs like the one shown in Fig. i Explain what is meant by the term involuntary action. ii The arm shown in Fig moves in response to the detection of heat. Explain how the parts of the reflex arc shown in Fig 5 1 bring about this response. iii Describe the advantages of simple reflexes such as the one shown in Fig 5 1. The diagram shows the pathway of a reflex arc,a Name the parts labeled A B C and D A. b Draw arrows on the diagram to show the direction of a nerve impulse in the parts labeled B and D 2. c What is the name of the gap between the parts labeled B and C. d How does the nerve impulse pass across this gap, i If the nerve to the arm were cut along the line marked X X how would this affect the person s movement. ii Give a reason for your answer, The diagram shows the main stages in a reflex action.
a The stimulus in this reflex action was a hot plate touching the hand. i Where are the receptor cells located,ii Name the type of nerve cell labeled A. ii Name the type of nerve cell labeled B, iv There is a third nerve cell between nerve cells A and B Where is this nerve cell located. v What would be the response to the hand touching a hot plate. vi How is this response brought about, Q21 Label the following on the diagram of spinal reflex. Sensory neuron,Relay neuron,Motor neuron,Mixed nerve. Grey matter,White matter, a If the man standing near the footpath wants to blink the eye to a girl near the mall how his nervous system.
will coordinate,The blood circulatory system,1 How do white cells differ from red cells. a in their structure,b their function,2 Where are blood cells made in the body. 3 Name two proteins carried in the plasma,4 What else is carried in the plasma. 5 Put the following events in their correct order starting with the first one listed. atria fill with blood semi lunar valves close tricuspid and bicuspid valves close. ventricles contract semi lunar valves open atria contract ventricles relax tricuspid and. bicuspid valves open,6 Fill in the missing words, Oxygenated blood from the lungs returns to the A atrium of the heart in the B. vein From here it enters the C ventricle and leaves the heart in the D to go to. From the body E blood returns via the F to the G atrium and then. leaves the heart in the H artery to go to the I, 7 Which one of the following is not a characteristic of capillary blood vessels.
a Repeatedly branched,b Small diameter,c Permeable to salts ions. d Thick walled, 8 Arteries carry blood the heart Veins carry blood the heart. 9 In which parts of the circulatory system are there valves. 10 What is the connection between tissue fluid plasma and lymph. 11 How is lymph propelled through the lymphatics,12 What is the function of lymph nodes. 13 Complete the table,Substance Transported by the blood. Oxygen A whole body,B whole body lungs,C liver kidneys.
D intestine E,Self assessment questions 12 02,The blood circulatory system continued. 14 After a period of vigorous activity you would expect blood leaving a muscle to have. a less carbon dioxide less oxygen and less glucose. b more carbon dioxide more oxygen and less glucose. c more carbon dioxide more oxygen and more glucose. d more carbon dioxide less oxygen and less glucose. 15 Blood from the alimentary canal returns to the heart by way of. a hepatic vein and vena cava,b hepatic artery hepatic vein and vena cava. c hepatic portal vein and vena cava,d hepatic portal vein hepatic vein and vena cava. 16 Describe briefly how platelets fibrin and red cells interact to form a blood clot. 17 Briefly describe the principal lines of defence against bacteria entering the blood system. 18 The substances produced by lymphocytes to combat bacterial cells are called. a antigens,b antibodies,c antidotes,d antitoxins, 19 You may acquire natural active immunity to a disease if. a you are injected with an antibody to the disease. b you recover from an attack of the disease,c you are inoculated against the disease.
d you are born with antibodies to the disease, 20 In each case give an example of a disease to which immunity can be acquired by injecting. a an inactivated bacterial toxin,b a killed bacterium. c an antibody, 21 A person whose blood group is AB can receive a blood transfusion from. a group O only,b group AB only,c groups A and B,d any group. 22 Apart from any inherited tendency towards coronary heart disease what are thought to be the four. main risk factors,TOPIC EXCRETION IN HUMANS AND HOMEOSTASIS.
1 A patient has dye injected into the blood supply to his kidneys The dye. appears in his excretory system as shown,Which part is blocked. A one kidney B one ureter C the bladder D the, 2 In which organ is urea formed and through which tube does it leave the. 3 Which substances are usually found in the urine of a healthy person. A glucose and proteins C salts and water,B salts and amino acids D water and. 4 During a long distance race the body temperature of an athlete begins to. Which changes occur to help return the body temperature to normal. 5 The diagram shows structures associated with the human urinary system. Which structure is the urethra, 6 How do sweat glands and blood vessels near the skin surface respond. when body temperature rises above normal,7 A person has a high protein diet.
What describes the level of urea in the blood leaving the liver and in the. leaving the kidneys, Study the following material and answer the questions that follow. Root hairs and water uptake by plants, Plants take in water from the soil through their root hairs. At the very tip is a root cap This is a layer of cells which protects the root as it grows. through the soil, The rest of the root is covered by a layer of cells called the epidermis. The root hairs are a little way up from the root tip Each root hair is a long epidermal. cell Root hairs do not live for very long As the root grows they are replaced by new ones. Root hair cells as seen under the light microscope. The hair is an extension of the cell and not a separate cellular structure. Functions of root hair cells,Increase the external surface area of the root. for absorption of water and mineral ions the hair increases the surface area of the cell. to make it more efficient in absorbing materials,Provide anchorage for the plant.
Passage of water through root stem and leaf, Water enters root hair cells by osmosis This happens when the water potential in. the soil surrounding the root is higher than in the cell water diffuses from the soil into. the root hair down its concentration gradient, As the water enters the cell its water potential becomes higher than in the cell next. to it e g in the cortex So water moves by osmosis into the next cell Some of water. may also just seep through the spaces between the cells or through the cell walls never. Q21 Label the following on the diagram of spinal reflex Sensory neuron Relay neuron Motor neuron Mixed nerve Ganglion Grey matter White matter Receptor Response Q22 a If the man standing near the footpath wants to blink the eye to a girl near the mall how his nervous system will coordinate

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