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61.

What is the fundamental unit of life?

Cell

Organ

DNA

Tissue

Explanation Comments

Answer: Cell

Explanation:

Cells are the basic structural and functional units of all living organisms.

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62.

Which organelle is known as the "powerhouse of the cell" and is responsible for energy production?

Mitochondrion

Ribosome

Nucleus

Golgi apparatus

Explanation Comments

Answer: Mitochondrion

Explanation:

Mitochondria are responsible for generating energy in the form of ATP through cellular respiration.

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63.

What is the process by which plants make their own food using sunlight, carbon dioxide, and water?

Digestion

Fermentation

Photosynthesis

Respiration

Explanation Comments

Answer: Photosynthesis

Explanation:

Photosynthesis is the process by which plants and some other organisms convert light energy into chemical energy in the form of glucose.

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64.

Which molecule carries genetic information and determines the traits of an organism?

Protein

DNA

Carbohydrate

Lipid

Explanation Comments

Answer: DNA

Explanation:

DNA (deoxyribonucleic acid) is the molecule that carries genetic information and is responsible for heredity.

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65.

What is the function of red blood cells in the human body?

Digesting food

Regulating body temperature

Carrying oxygen

Producing antibodies

Explanation Comments

Answer: Carrying oxygen

Explanation:

Red blood cells (erythrocytes) are responsible for transporting oxygen from the lungs to the body's tissues.

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66.

What is the process of the breakdown of complex organic molecules into simpler substances with the release of energy?

Respiration

Transpiration

Fermentation

Photosynthesis

Explanation Comments

Answer: Respiration

Explanation:

Respiration is the process by which cells obtain energy from organic molecules, typically involving the consumption of oxygen and the production of carbon dioxide.

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67.

Which organ is responsible for detoxifying harmful substances, storing glycogen, and producing bile?

Liver

Spleen

Kidney

Pancreas

Explanation Comments

Answer: Liver

Explanation:

The liver plays a crucial role in detoxification, glycogen storage, and bile production.

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68.

What is the role of white blood cells in the immune system?

Fighting infections

Carrying oxygen

Forming blood clots

Transporting nutrients

Explanation Comments

Answer: Fighting infections

Explanation:

White blood cells (leukocytes) are involved in the body's immune response and help fight off infections.

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69.

Which part of a plant is primarily responsible for photosynthesis?

Roots

Leaves

Flowers

Stem

Explanation Comments

Answer: Leaves

Explanation:

Leaves contain chloroplasts, where photosynthesis occurs, making them the primary site for this process in plants.

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70.

What is the main function of the nervous system in the human body?

Circulating blood

Transmitting signals

Producing hormones

Controlling movements

Explanation Comments

Answer: Transmitting signals

Explanation:

The nervous system is responsible for transmitting electrical signals that control various bodily functions, including movements and sensory perception.

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