SS3 second Term biology Past Questions and Answers

SS3 second Term biology Past Questions and Answers

SS3 Biology questions with options and answers:

Question: Which part of the human brain is responsible for regulating vital functions like heartbeat and breathing?

A) Cerebellum

B) Medulla oblongata

C) Hypothalamus

D) Thalamus

Answer: B) Medulla oblongata

Question: What is the function of white blood cells in the immune system?

A) Carry oxygen

B) Fight infections

C) Transport nutrients

D) Aid in digestion

Answer: B) Fight infections

Question: The process of water movement from an area of high concentration to an area of low concentration across a semi-permeable membrane is known as:

A) Active transport

B) Osmosis

C) Diffusion

D) Facilitated diffusion

Answer: B) Osmosis

Question: Which of the following is a function of the endocrine system?

A) Filtration of blood

B) Production of hormones

C) Digestion of food

D) Pumping blood

Answer: B) Production of hormones

Question: In DNA, adenine pairs with:

A) Thymine

B) Cytosine

C) Guanine

D) Uracil

Answer: A) Thymine

Question: What is the role of the enzyme pepsin in the digestive system?

A) Break down carbohydrates

B) Break down lipids

C) Break down proteins

D) Break down nucleic acids

Answer: C) Break down proteins

Question: Which gas is primarily responsible for the greenhouse effect?

A) Oxygen

B) Nitrogen

C) Carbon dioxide

D) Hydrogen

Answer: C) Carbon dioxide

Question: What is the function of the enzyme catalase in cells?

A) Break down carbohydrates

B) Break down lipids

C) Break down proteins

D) Break down hydrogen peroxide

Answer: D) Break down hydrogen peroxide

Question: What is the purpose of the Golgi apparatus in a cell?

A) Energy production

B) Protein synthesis

C) Lipid synthesis

D) Modification and packaging of proteins

Answer: D) Modification and packaging of proteins

Question: The primary function of the alveoli in the lungs is to:

A) Produce mucus

B) Exchange gases

C) Filter blood

D) Store oxygen

Answer: B) Exchange gases

Question: 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

Question: What is the function of the enzyme lipase?

A) Break down proteins

B) Break down carbohydrates

C) Break down lipids

D) Break down nucleic acids

Answer: C) Break down lipids

Question: Which of the following is a characteristic of both mitosis and meiosis?

A) Two daughter cells are produced

B) Four daughter cells are produced

C) One round of cell division

D) Occurs in somatic cells

Answer: C) One round of cell division

Question: The process of converting light energy into chemical energy in plants is known as:

A) Respiration

B) Photosynthesis

C) Fermentation

D) Glycolysis

Answer: B) Photosynthesis

Question: What is the function of insulin in the human body?

A) Increase blood sugar levels

B) Decrease blood sugar levels

C) Digest fats

D) Produce antibodies

Answer: B) Decrease blood sugar levels

Question: Which organelle is responsible for detoxifying harmful substances in the cell?

A) Nucleus

B) Smooth endoplasmic reticulum

C) Lysosome

D) Peroxisome

Answer: D) Peroxisome

Question: What is the function of the enzyme DNA polymerase in DNA replication?

A) Unzipping the DNA double helix

B) Synthesizing new DNA strands

C) Breaking down RNA

D) Breaking down DNA

Answer: B) Synthesizing new DNA strands

Question: The hormone melatonin is associated with the regulation of:

A) Blood pressure

B) Sleep-wake cycle

C) Blood sugar levels

D) Calcium levels

Answer: B) Sleep-wake cycle

Question: Which type of blood vessels carry blood away from the heart?

A) Veins

B) Arteries

C) Capillaries

D) Venules

Answer: B) Arteries

Question: What is the main function of the cornea in the human eye?

A) Refract light

B) Produce tears

C) Control pupil size

D) Detect light intensity

Answer: A) Refract light