General Science — Biology — Practice

Question 1

Which organelle is known as the 'powerhouse of the cell'?
(a) Nucleus (b) Ribosome (c) Mitochondria (d) Chloroplast

Accepted Answer

(c) Mitochondria.

Mitochondria generate energy (ATP), earning the 'powerhouse' name.

Question 2

Deficiency of vitamin C causes:
(a) Rickets (b) Scurvy (c) Night blindness (d) Beriberi

Accepted Answer

(b) Scurvy.

Vitamin C (ascorbic acid) deficiency causes scurvy.

Question 3

The number of chambers in the human heart is:
(a) Two (b) Three (c) Four (d) Five

Accepted Answer

(c) Four.

Two atria and two ventricles.

Question 4

The largest gland in the human body is the:
(a) Pancreas (b) Thyroid (c) Liver (d) Salivary gland

Accepted Answer

(c) Liver.

The liver is the largest gland; it secretes bile. The skin is the largest organ.

Question 5

Malaria is caused by:
(a) A virus (b) A bacterium (c) Plasmodium (protozoan) (d) A fungus

Accepted Answer

(c) Plasmodium (protozoan).

Malaria is caused by the protozoan Plasmodium, transmitted by the female Anopheles mosquito.

Question 6

An adult human body has how many bones?
(a) 202 (b) 206 (c) 208 (d) 212

Accepted Answer

(b) 206.

Adults have 206 bones (infants have more, which fuse with growth).

Question 7

Photosynthesis in plants takes place mainly in the:
(a) Mitochondria (b) Nucleus (c) Chloroplast (d) Ribosome

Accepted Answer

(c) Chloroplast.

Chloroplasts contain chlorophyll and carry out photosynthesis.

Question 8

Which blood group is known as the universal donor?
(a) AB positive (b) O negative (c) A positive (d) B negative

Accepted Answer

(b) O negative.

O⁻ has no A, B or Rh antigens, so it can be donated to any group; AB⁺ is the universal recipient.

Question 9

The 'Father of Genetics' is:
(a) Charles Darwin (b) Gregor Mendel (c) Robert Hooke (d) Louis Pasteur

Accepted Answer

(b) Gregor Mendel.

Mendel's pea-plant experiments established the laws of inheritance.

Practice — General Science — Biology