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Biology
GCSE

In a circuit with a 12V battery, 20Ω resistor and 10Ω resistor, all in series, calculate the current that would flow?

This question can be split into two parts, the first is calculating overall resistance: in series the Rtotal = R1 + R2 so here Rtotal = 10Ω + 20Ω = 30Ω The seco...

LA
Answered by Lauren A. • Biology tutor
4620 Views

Humans need to remove (excrete) waste products from the bloodstream. Describe the processes that produce waste products and how the products are removed from the body. (6 marks)

Urea is produced via the breakdown of amino acids in the liver, which is removed from the blood by the kidneys and excreted in urine. Carbon dioxide

KJ
Answered by Kizzy J. • Biology tutor
21308 Views

An individual is seated in a darkened room. What would you expect their pupils to look like? A light is shone onto their eyes and a change in their pupils is noted, what change would you expect and why?

In dark/dim conditions the human pupil dilates (diameter increases) to allow more light in.In bright conditions the pupil constricts (diameter decreases) and less light enters the eye.This is through a co...

TB
Answered by Tom B. • Biology tutor
2370 Views

What is the best way to memorise things for an exam?

Everyone revises differently, but I believe that the most efficient revision methods are active, rather than just reading notes. If you are a visual learner, my top tip would be making posters to put up a...

AM
Answered by Anna M. • Biology tutor
2768 Views

Explain how a simple reflex works, you answer should include a) one type of receptor and the stimulus that the receptor detects. b) how information is passed from the receptor to the effector

Type of receptor and stimulus e.g. eye receptors and light. Information is passed from the receptor to the effector by neurones: sensory, relay and motor. The receptor converts the stimulus into electric...

EC
Answered by Ellie C. • Biology tutor
3922 Views

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