Which of the following statements are wrong?
$(i)$ Leucocytes disintegrate in the spleen and liver.
$(ii)$ $RBC$,$WBC$ and blood platelets are produced by bone marrow.
$(iii)$ Neutrophils bring about destruction and detoxification of toxins of protein origin.
$(iv)$ The important function of lymphocytes is to produce antibodies.

  • A
    $(i)$ and $(ii)$ only
  • B
    $(i)$ and $(iv)$ only
  • C
    $(i)$ and $(iii)$ only
  • D
    $(ii)$ and $(iii)$ only

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What is the need for a circulatory system?

Match the following:
Disease: Cause
$A.$ Diabetes: $6.$ Increase in blood sugar level
$B.$ Uraemia: $7.$ Urea is in excess in blood
$C.$ Anaemia: $5.$ Fall in $RBC$ count
$D.$ Polycythemia: $3.$ Rise in $RBC$ count
$E.$ Pernicious or Megaloblastic anaemia: $2.$ Deficiency of vitamin ${B_{12}}$
$F.$ Leukemia: $8.$ Pathological increase in $WBC$
$G.$ Thrombocytopenia: $9.$ Decrease in the number of platelets
$H.$ Leucopenia: $4.$ Fall of $WBC$ count
$I.$ Leucocytosis: $1.$ Rise in $WBC$ count
The correct matching sequence is:

Assertion $A$: Anemia is sometimes observed in humans.
Reason $R$: There is a deficiency of iron and copper in the human body.
Which option is correct for Assertion $A$ and Reason $R$?

Describe the events in the cardiac cycle. Explain 'double circulation'.

The organ that acts as a filter for blood is:

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