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Biology
GCSE

Why does as an excess of nutrients such as nitrates lead to animal death in bodies of freshwater?

This is an unexpected result as usually nutrients are considered beneficial to organisms. Some organisms do benefit enourmously from the nutrients, but this leads to the deaths of other. The high concentr...

Answered by Daniel A. Biology tutor
2332 Views

Explain a reflex arc

A reflex arc is the nerve pathway which follows a reflex action. First a stimulus, like a pin prick, is detected by receptors in the skin. A sensory neurone then sends electrical impulses to a relay neuro...

Answered by Clara S. Biology tutor
8793 Views

State three ways in which a yeast cell differs from plant cells.

Yeast cells contain stored glycogen, whereas plant cells contain stored starch.
Plant cells reproduce through mitosis whereas yeast cells reproduce through binary fission
Plant cells contain chl...

Answered by Coralie B. Biology tutor
6819 Views

Describe how water moves from roots to leaves (3 marks)

Via the process of transpiration:Water is evaporated from the leaves in the canopy. Due to capillary action, this causes more water to move up the plant through the xylem vessels to replace the water as i...

Answered by Laura N. Biology tutor
4009 Views

Explain active transport

The movement of substances against a concentration gradient, requires energyUse diagram

Answered by Kitty P. Biology tutor
2003 Views

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