ILTS Biology Certification Examination
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
Question 1
The basic unit of life is the:
A. Organ
B. Tissue
C. Organ system
D. Cell
Answer: D. Cell
Rationale: The cell is the smallest structure capable of performing all essential life
functions.
Question 2
Which structure controls movement of substances into and out of a cell?
A. Nucleus
B. Ribosome
C. Cytoplasm
D. Cell membrane
Answer: D. Cell membrane
Rationale: The cell membrane is selectively permeable and regulates what enters
and leaves the cell.
,Question 3
Which organelle contains DNA in eukaryotic cells?
A. Golgi apparatus
B. Lysosome
C. Ribosome
D. Nucleus
Answer: D. Nucleus
Rationale: The nucleus stores and protects the genetic material of eukaryotic cells.
Question 4
The main function of ribosomes is:
A. Energy production
B. Waste removal
C. Lipid storage
D. Protein synthesis
Answer: D. Protein synthesis
Rationale: Ribosomes assemble amino acids into proteins using instructions from
RNA.
Question 5
Which organelle produces ATP during cellular respiration?
A. Chloroplast
B. Nucleus
C. Vacuole
D. Mitochondrion
Answer: D. Mitochondrion
Rationale: Mitochondria generate ATP through aerobic cellular respiration.
,Question 6
Plant cells contain which structure that animal cells lack?
A. Ribosome
B. Cell membrane
C. Mitochondrion
D. Cell wall
Answer: D. Cell wall
Rationale: Plant cells have rigid cell walls made primarily of cellulose for support
and protection.
Question 7
Photosynthesis occurs in the:
A. Nucleus
B. Mitochondrion
C. Ribosome
D. Chloroplast
Answer: D. Chloroplast
Rationale: Chloroplasts contain chlorophyll and are the site of photosynthesis.
Question 8
The pigment responsible for capturing light energy in plants is:
A. Hemoglobin
B. Melanin
C. Keratin
D. Chlorophyll
Answer: D. Chlorophyll
, Rationale: Chlorophyll absorbs light energy needed for photosynthesis.
Question 9
The movement of molecules from high concentration to low concentration is:
A. Active transport
B. Endocytosis
C. Exocytosis
D. Diffusion
Answer: D. Diffusion
Rationale: Diffusion is passive movement down a concentration gradient.
Question 10
Osmosis refers specifically to the movement of:
A. Proteins
B. Glucose
C. Salts
D. Water
Answer: D. Water
Rationale: Osmosis is the diffusion of water across a selectively permeable
membrane.
Question 11
Active transport requires:
A. Sunlight
B. Carbon dioxide
C. Oxygen only
D. ATP energy
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
Question 1
The basic unit of life is the:
A. Organ
B. Tissue
C. Organ system
D. Cell
Answer: D. Cell
Rationale: The cell is the smallest structure capable of performing all essential life
functions.
Question 2
Which structure controls movement of substances into and out of a cell?
A. Nucleus
B. Ribosome
C. Cytoplasm
D. Cell membrane
Answer: D. Cell membrane
Rationale: The cell membrane is selectively permeable and regulates what enters
and leaves the cell.
,Question 3
Which organelle contains DNA in eukaryotic cells?
A. Golgi apparatus
B. Lysosome
C. Ribosome
D. Nucleus
Answer: D. Nucleus
Rationale: The nucleus stores and protects the genetic material of eukaryotic cells.
Question 4
The main function of ribosomes is:
A. Energy production
B. Waste removal
C. Lipid storage
D. Protein synthesis
Answer: D. Protein synthesis
Rationale: Ribosomes assemble amino acids into proteins using instructions from
RNA.
Question 5
Which organelle produces ATP during cellular respiration?
A. Chloroplast
B. Nucleus
C. Vacuole
D. Mitochondrion
Answer: D. Mitochondrion
Rationale: Mitochondria generate ATP through aerobic cellular respiration.
,Question 6
Plant cells contain which structure that animal cells lack?
A. Ribosome
B. Cell membrane
C. Mitochondrion
D. Cell wall
Answer: D. Cell wall
Rationale: Plant cells have rigid cell walls made primarily of cellulose for support
and protection.
Question 7
Photosynthesis occurs in the:
A. Nucleus
B. Mitochondrion
C. Ribosome
D. Chloroplast
Answer: D. Chloroplast
Rationale: Chloroplasts contain chlorophyll and are the site of photosynthesis.
Question 8
The pigment responsible for capturing light energy in plants is:
A. Hemoglobin
B. Melanin
C. Keratin
D. Chlorophyll
Answer: D. Chlorophyll
, Rationale: Chlorophyll absorbs light energy needed for photosynthesis.
Question 9
The movement of molecules from high concentration to low concentration is:
A. Active transport
B. Endocytosis
C. Exocytosis
D. Diffusion
Answer: D. Diffusion
Rationale: Diffusion is passive movement down a concentration gradient.
Question 10
Osmosis refers specifically to the movement of:
A. Proteins
B. Glucose
C. Salts
D. Water
Answer: D. Water
Rationale: Osmosis is the diffusion of water across a selectively permeable
membrane.
Question 11
Active transport requires:
A. Sunlight
B. Carbon dioxide
C. Oxygen only
D. ATP energy
