GCSE Biology 3

Question 1

Which type of neuron carries impulses from the central nervous system to effectors such as muscles?

Accepted Answer

Motor neuron

Answer

Motor neurons transmit electrical impulses from the CNS to effectors, causing muscles to contract or glands to secrete.

Question 2

In a food web, what happens to the population of primary consumers if a large number of top predators are removed?

Accepted Answer

Primary consumer population increases

Answer

Removing top predators reduces predation pressure on primary consumers, allowing their population to increase — a classic trophic cascade.

Question 3

What is the function of amylase in digestion?

Accepted Answer

It breaks down starch into maltose

Answer

Amylase is a carbohydrase enzyme that catalyses the hydrolysis of starch into maltose, produced in the salivary glands and pancreas.

Question 4

Which process describes the movement of water from a region of high water potential to low water potential across a partially permeable membrane?

Accepted Answer

Osmosis

Answer

Osmosis is the net movement of water molecules across a partially permeable membrane down a water potential gradient.

Question 5

What is the main function of the lymphatic system in relation to immunity?

Accepted Answer

Carrying white blood cells and draining tissue fluid

Answer

The lymphatic system transports lymph, containing white blood cells (lymphocytes), and returns excess tissue fluid to the bloodstream.

GCSE - General Certificate of Secondary Education Practice Test