Question 1

Which of the following best describes the main function of life processes in living organisms?

Accepted Answer

To ensure the maintenance and survival of the organism by performing essential functions such as nutrition, respiration, and excretion.

Question 2

Which equation correctly represents the process of photosynthesis?

Accepted Answer

$$6CO_2 + 12H_2O \xrightarrow{Chlorophyll, Sunlight} C_6H_{12}O_6$ + 6O_2 + 6H_2O$$

Question 3

Why is it necessary for multicellular organisms to have specialized tissues for the transport of substances?

Accepted Answer

Because diffusion alone is insufficient for the transport of substances over long distances in large organisms.

Question 4

Which of the following is NOT a characteristic of autotrophic nutrition?

Accepted Answer

Dependence on other organisms for food.

Question 5

During photosynthesis, which event occurs immediately after the absorption of light energy by chlorophyll?

Accepted Answer

Conversion of light energy to chemical energy.

Question 6

A plant is kept in a closed container with no access to carbon dioxide. What will most likely happen to the rate of photosynthesis in this plant?

Accepted Answer

The rate of photosynthesis will decrease significantly.

Question 7

Which structure in the leaf is primarily responsible for the exchange of gases during photosynthesis?

Accepted Answer

Stomata

Question 8

Which of the following statements about heterotrophic nutrition is correct?

Accepted Answer

Organisms obtain their food by consuming other organisms or organic matter.

Question 9

In the experiment where a plant is kept in a bell jar with potassium hydroxide (KOH), what is the purpose of KOH?

Accepted Answer

To absorb carbon dioxide from the air inside the jar.

Question 10

Which of the following best explains why energy is required for life processes even when an organism is at rest?

Accepted Answer

Maintenance functions such as repair, growth, and internal transport continue even when the organism is not moving.

Question 11

Which of the following is a correct sequence of events in the process of photosynthesis?

Accepted Answer

Absorption of light energy by chlorophyll → Conversion of light energy to chemical energy → Splitting of water molecules → Reduction of carbon dioxide to carbohydrates

Question 12

Which of the following is a real-life example of heterotrophic nutrition?

Accepted Answer

A lion hunting and eating a deer in the wild.

Question 13

Which of the following statements about the role of enzymes in digestion is correct?

Accepted Answer

Enzymes help break down complex food molecules into simpler substances that can be absorbed by the body.

Question 14

A student sets up an experiment to test for the presence of starch in a leaf. Which result would indicate that photosynthesis has occurred?

Accepted Answer

The leaf turns blue-black when iodine solution is added.

Question 15

Which of the following is a key difference between autotrophic and heterotrophic nutrition?

Accepted Answer

Autotrophs synthesize their own food from inorganic substances, while heterotrophs obtain food from other organisms.

Question 16

Which of the following best explains why plants close their stomata during hot, dry conditions?

Accepted Answer

To reduce water loss through transpiration.

Question 17

Which of the following is a correct statement about the role of guard cells in plant leaves?

Accepted Answer

Guard cells regulate the opening and closing of stomata to control gas exchange and water loss.

Question 18

Which of the following is a multi-step process that integrates both autotrophic and heterotrophic nutrition in an ecosystem?

Accepted Answer

Plants produce glucose via photosynthesis, which is then consumed by herbivores, and subsequently by carnivores.

Life Processes: Nutrition and Maintenance in Living Organisms

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