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Describe what is meant by photoperiodism

A response controlled by relative light and dark periods. The name of the receptors responsible for absorbing light are phytochromes. The photoperiodic stimulus is detected by the

Answered by Amy O. • Biology tutor

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Describe the reflex arc.

A stimulus (for example a pin) stimulates the receptor which causes a nerve impulse in the sensory neuron. The impulse travels to a synapse in the spinal cord, where chemicals diffuse across the gap in th...

Answered by Sophie S. • Biology tutor

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What is a metabolic rate?

The rate of chemical reactions within the body.

Answered by Sophie S. • Biology tutor

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Could you run through the stages in the light-independent reaction (Calvin Cycle) of photosynthesis?

Okay, so here we have what seems like a very daunting list of chemical reactions to remember that don't seem to make any sense! But don't worry, with practice you wi...

Answered by Shane C. • Biology tutor

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