100 Best Biology MCQ

Q89). Our skin, when exposed to excess sunlight, becomes dark. This is because our skin pigments called

a).flavoxanthin
b).melanin
c).carotene
d).Xanthophyll

Correct Answer:
melanin
Explaination:

Q90). Ramapithecus and Cro-Magnon man are considered

a).ancestors of modern man
b).ancestors of monkey
c).ancestors of lion
d).None of the above

Correct Answer:
ancestors of modern man
Explaination:

Q91). Normal adult human male has

a).10 gram of haemoglobin/100 gram of blood
b).14 gram of haemoglobin/100 gram of blood
c).18 gram of haemoglobin/100 gram of blood
d).24 gram of haemoglobin/100 gram of blood

Correct Answer:
14 gram of haemoglobin/100 gram of blood
Explaination:

Q92). Plants wilt due to excess of

a).transpiration
b).photosynthesis
c).absorption
d).None of these

Correct Answer:
transpiration
Explaination:

Q93). Monotremes are unique mammals because they

a).posses hair
b).give birth to live young
c).secret milk in a pouch
d).lay eggs

Correct Answer:
lay eggs
Explaination:

Q94). Poison glands of snakes are homologous to

a).electric organs of fishes
b).stings of rays
c).sebaceous glands of mammals
d).salivary glands of vertebrates

Correct Answer:
salivary glands of vertebrates
Explaination:

Q95). Radical vascular bundles are those in which

a).xylem is surrounded by phloem
b).phloem is surrounded by xylem
c).xylem and phloem occur on the same radius
d).xylem and phloem occur on the different radii

Correct Answer:
xylem and phloem occur on the different radii
Explaination:

Q96). Plant bends towards the source of light on account of the movement of curvature known as

a).geotropism
b).thigmotropism
c).chemotropism
d).phototropism

Correct Answer:
phototropism
Explaination: