Top answers

What is the difference between passive and active immunity?

Active immunity involves your bodies direct response to an unknown pathogen. This response is the production of antibodies specific to the antigen of a particular pathogen. This type of immunity is not immed...
EP
Answered by Emily P. • Biology tutor
227963 Views

What is the difference between excretion and egestion? Name three major organs of excretion in humans, the substances they excrete and the function of this excretion.

Excretion is the removal of toxic materials, waste products of metabolism and excess substances from organisms. Egestion is the passing out of undigested food as faeces, through the anus. Three major organs ...
LW
Answered by Lucy W. • Biology tutor
119053 Views

Why do plants grow towards sunlight?

Plants have adapted to grow towards sunlight - an essential requirement for growth and survival. But how do they do this? An important factor in the control of plant growth is the hormone 'auxin', found with...
RD
Answered by Rachael D. • Biology tutor
19441 Views

Which enzymes are involved in digestion?

Several enzymes are involved in digestion. Amylase is produced by the salivary glands and pacreas and starts working as soon as food is ingested, breaking down starch into maltose in the mouth and also the s...
HH
Answered by Halcyon H. • Biology tutor
5804 Views

What are hormones and how do they differ from nerve cells (neurons)

Hormones are chemical messengers. They are released from special gland cells and travel in the bloodstream to reach their target organs, where they will have their effect. Whereas nerve cells carry electrica...
ND
Answered by Norviewu D. • Biology tutor
6366 Views