- ADecrease in progesterone.
- BIncrease in progesterone.
- ✓Decrease in estrogen.
- DBoth $2$ and $3.$
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$(i)$ 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
$A$. Concerned with lipid and steroidal hormone synthesis
$B$. Outer non-living rigid structure which gives shape to the cell and protects from mechanical damage and infection.
$C$. Both lie perpendicular to each other and each has an organisation like the cart wheel.
$D$. Responsible for trapping light energy for the synthesis of sugar.
$E$. Present in cells actively involved in protein synthesis and secretion.
$F$. Spherical structures, rich in hydrolytic enzymes.
$(i)$ Arteries are thickwalled and have narrow lumen as compared to veins.
$(ii)$ Angina is acute chest pain when the blood circulation to the brain is reduced.
$(iii)$ Persons with blood group AB can donate blood to any person with any blood group under $ABO$ system.
$(iv)$ Calcium ions play a very important role in blood clotting.Which two of the above statements are correct?
$(i)$ Reproduction is synonymous with growth
$(ii)$ Grow by cell division.
$(iii)$ Growth and reproduction are mutually exclusive events With respect to growth and reproduction, which all statements are true