Gas Exchange A level

What happens when you breathe in? (tick all that apply)

• diaphragm relaxes and moves up

• diaphragm contracts and flattens

• increases volume in thorax

• reduces volume in thorax

• pressure in thorax lower than outside

Name the structure through which gases enter and leave the body of an insect.

• tracheoles

• alveoli

• spiracle

• lungs

Name the small tubes that carry gases directly to and from the cells of an insect

• tracheoles

• system

• spiracle

• alveoli

Tubifex worms are small, thin animals that live in water. They have no specialised gas exchange or circulatory system. Name the process by which oxygen reaches the cells inside the body of a tubifex worm.

• active transport

• respiration

• diffusion

• facilitated diffusion

Which are features of leaves of xerophytes? (tick all that apply)

• thick cuticle

• flat leaves

• hairs on leaves

• raised stomata

What adaptations does the alveoli have for efficient gas exchange?

• thick walls

• thin walls

• small surface area

Suggest appropriate units for comparing the distribution of stomata on leaves.

• stomata per m2

• stomata per mm2

• stomata per cm2

• stomata per km2

The diagram shows the structure of the human gas exchange system. Name organ P.

• alveolus

• trachea

• bronchus

• diaphragm

The diagram shows the structure of the human gas exchange system. Name organ Q.

• alveolus

• trachea

• bronchus

• diaphragm

In this word equation for respiration, what is y representing?

Glucose + x --> y + water + energy

• carbon dioxide

• methane

• oxygen

• ATP

Tags

NGSS.HS-LS1-7