SIE EXAM QUESTIONS WITH WELL VERIFIED
ANSWERS WITH DETAILED
RATIONALES|LATEST UPDATE!!|2026
---
Section 1: Biology (Questions 1-50)
1. Which organelle is known as the "powerhouse of the cell"?
A) Ribosome
B) Nucleus
C) Mitochondria
D) Golgi Apparatus
Answer: C
Rationale: Mitochondria are the site of aerobic respiration, producing ATP
(energy) for the cell. Ribosomes make proteins, the nucleus houses DNA, and
the Golgi modifies/packages proteins.
2. What is the genetic material in the HIV virus?
A) DNA
B) RNA
C) Protein
D) Lipid
Answer: B
Rationale: HIV is a retrovirus, meaning its genetic material is single-stranded
RNA. It uses reverse transcriptase to convert this RNA into DNA once inside
the host cell.
,3. Which of these is a primary pigment found in plants?
A) Carotene
B) Xanthophyll
C) Chlorophyll a
D) Anthocyanin
Answer: C
Rationale: Chlorophyll a is the primary photosynthetic pigment, directly
involved in the light-dependent reactions. The others are accessory pigments.
4. The human heart has how many chambers?
A) 2
B) 3
C) 4
D) 5
Answer: C
Rationale: The human heart consists of four chambers: two upper atria (left
and right) and two lower ventricles (left and right).
5. What is the basic structural unit of the nervous system?
A) Nephron
B) Neuron
C) Axon
D) Dendrite
Answer: B
,Rationale: The neuron (nerve cell) is the fundamental unit of the nervous
system, responsible for receiving and transmitting impulses. Nephron is the
kidney unit.
6. Which blood cells are primarily responsible for fighting infections?
A) Red Blood Cells
B) Platelets
C) White Blood Cells
D) Plasma
Answer: C
Rationale: White blood cells (leukocytes) are crucial for the immune system,
defending the body against pathogens. RBCs carry oxygen, and platelets aid in
clotting.
7. The process of programmed cell death is called:
A) Necrosis
B) Apoptosis
C) Autolysis
D) Phagocytosis
Answer: B
Rationale: Apoptosis is a regulated, controlled process of cell suicide, essential
for development and maintaining health. Necrosis is uncontrolled cell death
due to injury.
8. Which organ filters urea from the blood?
A) Liver
B) Kidney
, C) Spleen
D) Pancreas
Answer: B
Rationale: The kidneys filter blood, removing waste products like urea to form
urine. The liver produces urea from ammonia.
9. What type of joint is the elbow?
A) Ball and Socket
B) Pivot
C) Hinge
D) Gliding
Answer: C
Rationale: The elbow is a hinge joint, allowing movement in one plane (flexion
and extension), similar to a door hinge.
10. Which hormone regulates blood sugar levels?
A) Thyroxine
B) Insulin
C) Adrenaline
D) Estrogen
Answer: B
Rationale: Insulin, produced by the pancreas, regulates blood sugar by
facilitating glucose uptake into cells. Thyroxine regulates metabolism.
11. What is the protective covering of the brain called?
A) Meninges
ANSWERS WITH DETAILED
RATIONALES|LATEST UPDATE!!|2026
---
Section 1: Biology (Questions 1-50)
1. Which organelle is known as the "powerhouse of the cell"?
A) Ribosome
B) Nucleus
C) Mitochondria
D) Golgi Apparatus
Answer: C
Rationale: Mitochondria are the site of aerobic respiration, producing ATP
(energy) for the cell. Ribosomes make proteins, the nucleus houses DNA, and
the Golgi modifies/packages proteins.
2. What is the genetic material in the HIV virus?
A) DNA
B) RNA
C) Protein
D) Lipid
Answer: B
Rationale: HIV is a retrovirus, meaning its genetic material is single-stranded
RNA. It uses reverse transcriptase to convert this RNA into DNA once inside
the host cell.
,3. Which of these is a primary pigment found in plants?
A) Carotene
B) Xanthophyll
C) Chlorophyll a
D) Anthocyanin
Answer: C
Rationale: Chlorophyll a is the primary photosynthetic pigment, directly
involved in the light-dependent reactions. The others are accessory pigments.
4. The human heart has how many chambers?
A) 2
B) 3
C) 4
D) 5
Answer: C
Rationale: The human heart consists of four chambers: two upper atria (left
and right) and two lower ventricles (left and right).
5. What is the basic structural unit of the nervous system?
A) Nephron
B) Neuron
C) Axon
D) Dendrite
Answer: B
,Rationale: The neuron (nerve cell) is the fundamental unit of the nervous
system, responsible for receiving and transmitting impulses. Nephron is the
kidney unit.
6. Which blood cells are primarily responsible for fighting infections?
A) Red Blood Cells
B) Platelets
C) White Blood Cells
D) Plasma
Answer: C
Rationale: White blood cells (leukocytes) are crucial for the immune system,
defending the body against pathogens. RBCs carry oxygen, and platelets aid in
clotting.
7. The process of programmed cell death is called:
A) Necrosis
B) Apoptosis
C) Autolysis
D) Phagocytosis
Answer: B
Rationale: Apoptosis is a regulated, controlled process of cell suicide, essential
for development and maintaining health. Necrosis is uncontrolled cell death
due to injury.
8. Which organ filters urea from the blood?
A) Liver
B) Kidney
, C) Spleen
D) Pancreas
Answer: B
Rationale: The kidneys filter blood, removing waste products like urea to form
urine. The liver produces urea from ammonia.
9. What type of joint is the elbow?
A) Ball and Socket
B) Pivot
C) Hinge
D) Gliding
Answer: C
Rationale: The elbow is a hinge joint, allowing movement in one plane (flexion
and extension), similar to a door hinge.
10. Which hormone regulates blood sugar levels?
A) Thyroxine
B) Insulin
C) Adrenaline
D) Estrogen
Answer: B
Rationale: Insulin, produced by the pancreas, regulates blood sugar by
facilitating glucose uptake into cells. Thyroxine regulates metabolism.
11. What is the protective covering of the brain called?
A) Meninges
