Biology 9th Chap 8 : Topic 12 - Maryam Publications

Biology Chapter 8 : Topic 12

Homeostasis in Plants

1 / 15

Homeostasis is the ability of an organism to:

A) Reproduce rapidly

B) Maintain a stable internal environment

C) Increase body size continuously

D) Produce food

2 / 15

Which of the following best defines homeostasis?

A) Movement of substances in the body

B) Breakdown of food to release energy

C) Maintenance of a constant internal environment

D) Production of hormones

3 / 15

Why is homeostasis important?

A) It helps organisms maintain optimal conditions for cellular activities.

B) It prevents respiration.

C) It stops growth.

D) It increases mutation rate.

4 / 15

Which condition is regulated by homeostasis in humans?

A) Number of chromosomes

B) Body temperature

C) Height

D) Eye color

5 / 15

A person starts sweating on a hot day. This is an example of:

A) Reproduction

B) Digestion

C) Homeostasis

D) Respiration

6 / 15

Which of the following is NOT an example of homeostasis?

A) Shivering in cold weather

B) Pollination in plants

C) Sweating in hot weather

D) Maintaining blood glucose levels

7 / 15

Homeostasis helps organisms survive because it:

A) Prevents all diseases

B) Increases body mass

C) Stops metabolism

D) Maintains suitable internal conditions

8 / 15

Which process helps maintain water balance in the body?

A) Homeostasis

B) Fertilization

C) Germination

D) Photosynthesis

9 / 15

Shivering during cold weather helps maintain:

A) Oxygen concentration

B) Blood pressure

C) Body temperature

D) Heart rate only

10 / 15

Homeostasis mainly ensures that enzymes work:

A) Without energy

B) At unsuitable conditions

C) Efficiently under stable conditions

D) Only in cold environments

11 / 15

Which of the following is controlled by homeostasis?

A) Water balance

B) All of the above

C) Blood glucose level

D) Internal temperature

12 / 15

If homeostasis fails, cells may:

A) Stop being affected by the environment

B) Produce more chlorophyll

C) Function normally

D) Be unable to carry out normal metabolic activities

13 / 15

Which statement about homeostasis is correct?

A) It helps maintain internal balance despite external changes.

B) It occurs only during growth.

C) It occurs only in animals.

D) It is a type of reproduction.

14 / 15

A rise in body temperature triggers sweating. This response helps:

A) Increase glucose levels

B) Reduce oxygen intake

C) Increase body temperature further

D) Maintain homeostasis

15 / 15

Which statement best describes the importance of homeostasis?

A) It produces energy directly.

B) It increases reproduction rate.

C) It prevents nutrient absorption.

D) It keeps internal conditions stable for normal life processes.

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