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) Maintain a stable internal environment

B) Reproduce rapidly

C) Produce food

D) Increase body size continuously

2 / 15

Which of the following best defines homeostasis?

A) Maintenance of a constant internal environment

B) Production of hormones

C) Breakdown of food to release energy

D) Movement of substances in the body

3 / 15

Why is homeostasis important?

A) It stops growth.

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

C) It increases mutation rate.

D) It prevents respiration.

4 / 15

Which condition is regulated by homeostasis in humans?

A) Body temperature

B) Number of chromosomes

C) Height

D) Eye color

5 / 15

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

A) Digestion

B) Respiration

C) Homeostasis

D) Reproduction

6 / 15

Which of the following is NOT an example of homeostasis?

A) Maintaining blood glucose levels

B) Shivering in cold weather

C) Pollination in plants

D) Sweating in hot weather

7 / 15

Homeostasis helps organisms survive because it:

A) Increases body mass

B) Maintains suitable internal conditions

C) Prevents all diseases

D) Stops metabolism

8 / 15

Which process helps maintain water balance in the body?

A) Fertilization

B) Germination

C) Homeostasis

D) Photosynthesis

9 / 15

Shivering during cold weather helps maintain:

A) Heart rate only

B) Oxygen concentration

C) Body temperature

D) Blood pressure

10 / 15

Homeostasis mainly ensures that enzymes work:

A) Efficiently under stable conditions

B) Only in cold environments

C) Without energy

D) At unsuitable conditions

11 / 15

Which of the following is controlled by homeostasis?

A) All of the above

B) Water balance

C) Internal temperature

D) Blood glucose level

12 / 15

If homeostasis fails, cells may:

A) Produce more chlorophyll

B) Stop being affected by the environment

C) Function normally

D) Be unable to carry out normal metabolic activities

13 / 15

Which statement about homeostasis is correct?

A) It occurs only during growth.

B) It helps maintain internal balance despite external changes.

C) It is a type of reproduction.

D) It occurs only in animals.

14 / 15

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

A) Reduce oxygen intake

B) Maintain homeostasis

C) Increase glucose levels

D) Increase body temperature further

15 / 15

Which statement best describes the importance of homeostasis?

A) It increases reproduction rate.

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

C) It prevents nutrient absorption.

D) It produces energy directly.

Your score is

0%