Revision Quiz 2 Grade 6

Which numbered structure focuses the light on the retina, where it is detected by photoreceptors?

• 1

• 2

• 3

• 4

Which part of the eye allows light to enter?

• Cornea

• Lens

• Pupil

• Retina

Which part the eye protects it from dust and foreign particles?

• Iris

• Cornea

• Retina

• Pupil

Which is the main function of the iris?

• Focuses light onto the retina

• Changes images into electric signals

• Protects the eye

• controls the size of the pupil

what is the role of the lens in the eye?

• Changing images into electric signals

• Protecting the eye

• Focusing images onto the back of the eye

• Carrying signals to the brain

What distinguishes a closed circulatory system from an open one?

• The speed of blood movement

• The presence of capillaries

• The type of vessel used for blood transport

• The method by which oxygen and nutrient enter organ

In an open circulatory system how do oxygen and nutrient reach cells and tissues?

• Through capillaries

• Directly from bloodstream

• Through diffusion from surrounding spaces

• Through specialized transport proteins.

Which circulatory system typically results in slower blood movement?

• Open circulatory system

• Closed circulatory system

• Both system have similar blood flow

• None of the above

How do closed circulatory systems facilitate the delivery of oxygen and nutrient to organs?

• Through capillaries

• Directly from the bloodstream

• Via specialized transport proteins.

• Through open spaces surrounding organs

How to closed circulatory system facilitates the delivery of oxygen and nutrients to organs?

• Through capillaries

• Directly from the blood stream

• Via specialized transport proteins

• Through open spaces surrounding organ