Here Are 50 Multiple-Choice Questions (Mcqs) Based On The
Indian Syllabus For 2023
Class 12
BIOLOGY
**1.** Which of the following cell organelles is responsible for protein synthesis?
a) Mitochondria
b) Golgi apparatus
c) Nucleus
d) Ribosomes
**Answer: d) Ribosomes**
**2.** Which enzyme is responsible for breaking down carbohydrates in the
mouth?
a) Lipase
b) Amylase
c) Trypsin
d) Pepsin
**Answer: b) Amylase**
**3.** Blood type AB is an example of:
a) Complete dominance
,b) Codominance
c) Incomplete dominance
d) Recessive inheritance
**Answer: b) Codominance**
**4.** The process of conversion of ammonia into nitrate compounds is called:
a) Nitrification
b) Denitrification
c) Ammonification
d) Nitrogen fixation
**Answer: a) Nitrification**
**5.** Which of the following is a fat-soluble vitamin?
a) Vitamin C
b) Vitamin B12
c) Vitamin D
d) Vitamin B6
**Answer: c) Vitamin D**
**6.** The phenomenon of movement of water molecules through a
semipermeable membrane from an area of low solute concentration to an area of
high solute concentration is known as:
, a) Osmosis
b) Diffusion
c) Active transport
d) Facilitated diffusion
**Answer: a) Osmosis**
**7.** The innermost layer of the eyeball that contains photoreceptor cells is the:
a) Sclera
b) Cornea
c) Retina
d) Choroid
**Answer: c) Retina**
**8.** In which phase of the cell cycle does DNA replication occur?
a) G1 phase
b) S phase
c) G2 phase
d) M phase
**Answer: b) S phase**
**9.** The enzyme responsible for breaking down hydrogen peroxide into water
and oxygen is:
Indian Syllabus For 2023
Class 12
BIOLOGY
**1.** Which of the following cell organelles is responsible for protein synthesis?
a) Mitochondria
b) Golgi apparatus
c) Nucleus
d) Ribosomes
**Answer: d) Ribosomes**
**2.** Which enzyme is responsible for breaking down carbohydrates in the
mouth?
a) Lipase
b) Amylase
c) Trypsin
d) Pepsin
**Answer: b) Amylase**
**3.** Blood type AB is an example of:
a) Complete dominance
,b) Codominance
c) Incomplete dominance
d) Recessive inheritance
**Answer: b) Codominance**
**4.** The process of conversion of ammonia into nitrate compounds is called:
a) Nitrification
b) Denitrification
c) Ammonification
d) Nitrogen fixation
**Answer: a) Nitrification**
**5.** Which of the following is a fat-soluble vitamin?
a) Vitamin C
b) Vitamin B12
c) Vitamin D
d) Vitamin B6
**Answer: c) Vitamin D**
**6.** The phenomenon of movement of water molecules through a
semipermeable membrane from an area of low solute concentration to an area of
high solute concentration is known as:
, a) Osmosis
b) Diffusion
c) Active transport
d) Facilitated diffusion
**Answer: a) Osmosis**
**7.** The innermost layer of the eyeball that contains photoreceptor cells is the:
a) Sclera
b) Cornea
c) Retina
d) Choroid
**Answer: c) Retina**
**8.** In which phase of the cell cycle does DNA replication occur?
a) G1 phase
b) S phase
c) G2 phase
d) M phase
**Answer: b) S phase**
**9.** The enzyme responsible for breaking down hydrogen peroxide into water
and oxygen is:
