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71.

Which of the following is not a primary macronutrient for living organisms?

Carbohydrate

Lipid

Protein

Vitamins

Explanation Comments

Answer: Vitamins

Explanation:

Vitamins are essential micronutrients, not macronutrients like carbohydrates, proteins, and lipids.

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72.

What is the purpose of the circulatory system in the body?

Excretion

Digestion

Oxygen exchange

Respiration

Explanation Comments

Answer: Oxygen exchange

Explanation:

The circulatory system is responsible for the transport of oxygen, nutrients, and waste products throughout the body.

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73.

Which of the following is a storage polysaccharide found in animals?

Starch

Glycogen

Chitin

Cellulose

Explanation Comments

Answer: Glycogen

Explanation:

Glycogen is the storage polysaccharide in animals, similar to the role of starch in plants.

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74.

What is the process by which an organism produces offspring similar to itself?

Reproduction

Respiration

Digestion

Growth

Explanation Comments

Answer: Reproduction

Explanation:

Reproduction is the process by which organisms generate offspring, passing on their genetic information.

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75.

Which gas is essential for respiration and is removed from the body during exhalation?

Hydrogen

Nitrogen

Carbon dioxide

Oxygen

Explanation Comments

Answer: Carbon dioxide

Explanation:

Carbon dioxide is a waste product of respiration and is removed from the body during exhalation.

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76.

What is the function of the ribosomes in a cell?

Protein synthesis

DNA replication

Lipid storage

Energy production

Explanation Comments

Answer: Protein synthesis

Explanation:

Ribosomes are responsible for protein synthesis in a cell by translating genetic information from mRNA into proteins.

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77.

What is the primary function of the respiratory system in the human body?

Digestion

Oxygen intake

Blood circulation

Hormone production

Explanation Comments

Answer: Oxygen intake

Explanation:

The primary function of the respiratory system is to facilitate the exchange of oxygen and carbon dioxide between the body and the environment.

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78.

Which of the following is an example of an invertebrate animal?

Worm

Bird

Frog

Fish

Explanation Comments

Answer: Worm

Explanation:

Worms are examples of invertebrate animals, as they lack a vertebral column or backbone.

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79.

What is the name of the pigment responsible for the green color of plant leaves?

Chlorophyll

Carotene

Melanin

Hemoglobin

Explanation Comments

Answer: Chlorophyll

Explanation:

Chlorophyll is the pigment that gives plant leaves their green color and is essential for photosynthesis.

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80.

Which biological macromolecule is primarily responsible for energy storage in the human body?

Nucleic acid

Lipid

Carbohydrate

Protein

Explanation Comments

Answer: Lipid

Explanation:

Lipids, such as fats, are the primary macromolecules responsible for energy storage in the human body.

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