21) Bamboo is classified as
a)Bush
b)Tree
c)Grass
d)Weed
22) Which one among the following is known as ‘animal starch’ ?
a)Cellulose
b) Glycogen
c) Pectin
d) Chitin
23) Who discovered the Polio vaccine ?
a)Louis Pasteur
b) Jonas Salk
c)Konrad Zuse
d) Eli Whitney
24) Oxyreductases, transferases, hydrolases, lyases, isomerases and ligases are all classes of
a) hormones
b) enzymes
c) proteins
d) vitamins
25) Ozone hole refers to
a) hole in ozone layer
b) decrease in the ozone layer in troposphere
c) decrease in thickness of ozone layer in stratosphere
d) increase in the thickness of ozone layer in troposphere
27) Non-clotting of blood is caused by deficiency of ?
a) Vitamin A
b) Vitamin C
c) Vitamin E
d) Vitamin K
28) Monotremes are unique mammals because they
a) posses hair
b) give birth to live young
c) secret milk in a pouch
d) lay eggs
29) One of the following is not a function of bones.
a) Place for muscle attachment
b) Protection of vital organs
c) Secretion of hormones for calcium regulation in blood and bones
d) Production of blood corpuscles
30) N2 content is kept constant in the biosphere due to
a) N2 fixation
b) industrial pollution
c) nitrogen cycle
d) absorption of N2