Hello friend as you want the previous year question papers of Banaras Hindu University Pre Medical Test so here I am providing you the same….

1. What are poikilothermic animals ?
Ans. Also called cold blooded animals. Their body temperature changes according surrounding environment. These
animals are less active.
e.g. all invertebrates, fishes, amphibians, reptiles.
2. Write two functions of juxtaglomerular apparatus.
Ans. Functions :
(i) Juxtaglomerular cells secretes Renin which through RAAS (Renin-Angiotensis Aldosterone System) help in
absorption of Na+ from DCT and therefore increases Blood pressure.
(ii) Its Macula densa cells act as chemorecptor feeding information to JG cells.
3. State two differences between red and white muscle.
Ans. Difference between Red & White Muscle.
Red Muscles White Muscles
i) Rich in Myoglobin. i) Less myoglobin.
ii) Mitochondria are more in number. ii) Less in number.
iii) Less sarcoplasmic reticulum. iii) More sarcoplasmic reticulum.
iv) Can carry out considerable aerobic
respiration.
iv) Depends mainly on anaerobic
respiration.
v) Slow rate of contraction for long
period.
v) Fast rate of contraction for short
period.
4. What is the difference between pinocytosis and phagocytosis ?
Ans.
Phagocytosis Pinocytosis
i) Bulk intake of fluid material by cell. i) Intake of solid material from outside to
inside of the cell.
ii) Vesicles formed are small. ii) Large
iii) Lysosome play no role. iii) Lysosomes are essential.
5. State four important functions of plasma membrane.
Ans. (i) Helps in Transport by active and passive processes.
(ii) Take part in Exocytosis and Endocytosis.
6. What is bioaccumulation ?
Ans. Different types of elements and compound deposited inside the living beings. Which is called Bioaccumulation or
Bioconcentration. Like in scallops maximum quantity of Zn, Cu, Cd and Cr deposited and in human beings
maximum Iodide deposieted in thyroid glands.

7. What is a test cross ? Why is it so named ?
Ans. When F1 progeny is crossed with recessive parent then it is called Test Cross. Test Cross helps to find out the
genotype of dominant individual.
8. What is ribozyme ?
Ans. Ribozymes are the RNA molecules (Non protein enzyme) that possess catalytic activity they function in RNA
splicing reactions.
9. What are mycorrhizae?
Ans. The association of fungi with the roots of higher plant, is called mycorrhizae. Mycorrhizal association fround in
conifers plant.
10. Write down the scientific name of China rose plant. Give its floral formula.
Ans. Hibiscus rosasinensis :