8.1 Biology

All of the organisms below use blood to carry oxygen except

• Insects

• Humans

• Amphibians

• Fish

Alveolus is present in

• Fish gills

• Human lungs

• Frog skin

• Frog lungs

How do frog adapt to breathe?

• Moist skin

• Dense network of blood capillaries under skin

• Folded surface of lungs

• Thin skin

Which arrow points to lamella?

• A

• B

• C

• D

Why frog is more vulnerable to air pollutants than human?

• Their skin is very permeable and is exposed to air pollutants

• They breathe more air

• They like to be poisoned

• The pollutants prefer to poison frogs

Insects will suffocate when

• its abdomen is immersed in water

• its head is immersed in water

• Insects cannot suffocate

Respiratory system of insect is called

• Trachea system

• Tracheal system

• Tracheole system

• Air sac system

• Spiracle system

The structure in the blank is:

Gills --> Gill arch --> _________ -->Lamella

• Operculum

• Gill filament

• Gill raker

• Lamella holder

Sum of surface area of alveoli in human is about 100 squared metre. How is it useful? (Choose 2)

• Increase TSA/V ratio

• Increase rate of diffusion

• Deliver respiratory gas efficiently

• Decrease distance for diffusion