Unit-7

11th Standard

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Biology

Time : 00:03:00 Hrs
Total Marks : 78
    15 x 1 = 15
  1. Which one of the following plasma proteins is involved in the coagulation of blood?

    (a)

    Globulin

    (b)

    Fibrinogen

    (c)

    Albumin

    (d)

    Serum amylase

  2. Which of the following WBCs are found in more numbers

    (a)

    Eosinophil

    (b)

    Neutrophil

    (c)

    Basophil

    (d)

    Monocyte

  3. Which of the following is not involved in blood clotting?

    (a)

    Fibrin

    (b)

    Calcium

    (c)

    Platelets

    (d)

    Bilirubin

  4. Lymph is colourless because

    (a)

    WBC are absent

    (b)

    WBC are present

    (c)

    Haemoglobin is absent

    (d)

    RBC are absent

  5. Blood group is due to the presence or absence of surface

    (a)

    Antigens on the surface of WBC

    (b)

    Antibodies on the surface of  RBC

    (c)

    Antigens of the surface of RBC

    (d)

    Antibodies on the surface of WBC

  6. A person having both 'antigen A and antigen B on the surface of RBCs belongs to blood group

    (a)

    A

    (b)

    B

    (c)

    AB

    (d)

    O

  7. Erythroblastosis foetalis is due to the destruction of

    (a)

    Foetal RBCs

    (b)

    Foetus suffers from atherosclerosis

    (c)

    Foetal WBCs

    (d)

    Foetus suffers from minamita

  8. Dub sound of heart is caused by

    (a)

    Closure of atrio-ventricular valves

    (b)

    Opening of semi-lunar valves

    (c)

    Closure of semi -lunar values

    (d)

    Opening of atrio-ventricular valves

  9. Why is the velocity of blood flow the lowest in the capillaries?

    (a)

    The systemic capillaries are supplied by the left ventricle, which has a lower cardiac output than the right ventricle

    (b)

    Capillaries are far from the heart, and blood flow slows as distance from the heart increases

    (c)

    The total surface area of the capillaries is larger than the total surface area of the arterioles

    (d)

    The capillary walls are not thin enough to allow oxygen to exchange with the cells

    (e)

    The diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate

  10. An unconscious patient is rushed into the emergency room and needs a fast blood transfusion. Because ~there is no time to check her medical history or determine her blood type, which type of blood should you as her doctor, give her?

    (a)

    A-

    (b)

    AB

    (c)

    O+

    (d)

    O-

  11. At the venous end of the capillary bed, the osmotic pressure is

    (a)

    Greater than the hydrostatic pressure

    (b)

    Result in net outflow of fluids

    (c)

    Results in net absorption of fluids

    (d)

    No change occurs

  12. A patient's chart reveals that he has a cardiac output of 7500mL per minute and a stroke volume of 50 mL. What is his pulse rate (in beats/min)?

    (a)

    50

    (b)

    100

    (c)

    150

    (d)

    400

  13. At any given time there is more blood in the venous system than that of the arterial system. Which of the following features of the veins allows this?

    (a)

    Relative lack of smooth muscles

    (b)

    Presence of valves

    (c)

    Proximity of the veins to lymphatic's

    (d)

    Thin endothelial lining

  14. Which of these functions could or could not be carried out by a red blood cell? Briefly justify your answer.
    a. Protein synthesis
    b. Cell division
    c. Lipid synthesis
    d. Active transport

    (a)

    Protein synthesis

    (b)

    Cell division

    (c)

    Lipid synthesis

    (d)

    Active transport

  15. What is the function of lymph?

    (a)

    Transport of O2 into brain

    (b)

    Transport of CO2 into lungs

    (c)

    Bring interstitial fluid in blood

    (d)

    Bring RBC and WBC in lymph node

  16. 11 x 3 = 33
  17. Distinguish between arteries and veins.

  18. Distinguish between open and closed circulation

  19. Distinguish between mitral valve and semi lunar valve.

  20. Right ventricular wall is thinner than the left ventricular wall Why

  21. What might be the effect on a person whose diet has less iron content?

  22. Protein molecules of larger size can pass through the lymph vessel? Give reason.

  23. The disease kwashiorkor is caused by a diet which is very low in protein. The concentration of proteins in blood becomes much lower than usual. One of the symptoms of kwashiorkor is edema. Give reasons.

  24. Why there are no blood capillaries in the cornea of the eye and cartilage? How are these regions supplied with the required nutrients?

  25. Suggest why arteries close to the heart have more elastic fibres in their walls than arteries further away from the heart?

  26. When blood volume drops down abruptly, what happens to the stroke volume? State whether it increases or decreases?

  27. Ramu was 45 years old when he went to a doctor to check his blood pressure. His pressure was around 158/98mmHg. The doctor advised him to measure his blood pressure at home for two weeks. He came to the doctor saying his average -blood pressure was around 160/100mmHg. Doctor concludes that Ramu has high blood pressure or hypertension. If not controlled, hypertension can lead to heart failure, stroke and kidney failure. He returned to the doctor after two months after taking the drug, ACH inhibitor. This chemical blocks the production of angiotensin II, a powerful vasoconstrictor, so his blood pressure returned back to normal.
    1. Why are people with high blood pressure at greater risk for having a hemorrhagic stroke?
    2. Without medication Ramu's blood pressure was around 160/100mmHg after two weeks. Why this pressure was referred to as hypertension by the doctor.
    3. Blocking the action of vasoconstrictor lower the blood pressure? Give reasons.
    4. What is the role of ACH inhibitor in reducing blood pressure?
    5. What conditions one might expect if the blood pressure is not controlled?

  28. 6 x 5 = 30
  29. Describe the mechanism by which the human heart beat is initiated and controlled.

  30. What is lymph? Write its function.

  31. What are the heart sounds? When and how are these sounds produced?

  32. Select the correct biological term
    Lymphocytes, red cells, leucocytes, plasma, erythrocytes, white cells, haemoglobin , phagocyte, platelets, blood clot.
    (a) Disc shaped cells which are concave on both sides.
    (b) Most of these have a large, bilobed nucleus.
    (c) Enable red cells to transport blood.
    (d) The liquid part of the blood.
    (e) Most of them move and change shape like an amoeba.
    (f) Consists of water and important dissolved substances.
    (g) Destroyed in the liver and spleen after circulating in the blood for four months.
    (h) The substances which give red cells their colour .
    (i) Another name for red blood cells
    (j) Blood that has been changed to a jelly
    (k) A word that means cell eater.
    (l) Cells without nucleus .
    (m) White cells made in the lymphatic tissue.
    (n) Blocks wound and prevent excessive bleeding.
    (o) Fragment of cells which are made in the bone marrow.
    (P) Another name for white blood cells.
    (q) Slowly releases oxygen to blood cells.
    (r) Their function is to help blood clot in wounds.

  33. Select the correct biological term.
    Cardiac muscle, atria, tricuspid systole, auricles, arteries, diastole, ventricles, bicuspid valve, pulmonary artery, cardiac cycle, semilunar valve, veins, pulmonary vein, capillaries, vena cava, aorta.
    (a) The main artery of the blood
    (b) Valves between the left atrium and ventricle
    (c) Technical name for relaxation of the heart.
    (d) Another name for atria.
    (e) The main vein.
    (f) Vessels which carry blood away from the heart
    (g) Two names for the upper chambers of the heart
    (h) Thick walled chambers of the heart.
    (i) Carries blood from the heart to the lungs
    (j) Takes about 0.8 sec to complete.
    (k) Valves situated at the point where blood flows out of the heart.
    (l) Vessels which carry blood towards the heart
    (m) Carries blood from the lungs to the heart.
    (n) The two lower chambers of the heart.
    (o) Prevent blood from re-entering the ventricles after entering the aorta.
    (p) Technical name for one heartbeat.
    (q) Valves between right atrium and ventricles.
    (r) Technical name for contraction of the heart.
    (s) Very narrow blood vessels.

  34. Name and Label the given diagrams to show A, B, C, D, E, F, and G

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