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Explain the processes of translocation and transpiration in plants (6 marks)

Transpiration is the upward movement of water from the root to the cell. This happens in the xylem which is made of lignified cells. The flow is only in one direction and the movement of water is created by ...
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Answered by Zoe S. • Biology tutor
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Sophie accidentally puts her hand on an open flame, she immediately withdraws her hand. This is an example of a reflex reaction. Describe how a reflex reaction is coordinated.

Reflex reactions are subconscious, they bypass the brain. Receptors detect a sensory stimulus, in this case- pain. Receptors stimulate sensory neurons, creates an electric impulse which travels to the spinal...
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Answered by Amelia L. • Biology tutor
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What are the limiting factors of photosynthesis?

A limiting factor is an environmental factor that restricts metabolic reactions from occurring within an organism. The 3 main limiting factors in photosynthesis are the light intensity, carbon dioxide concen...
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Answered by Antonia H. • Biology tutor
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What is the difference between natural selection and evolution?

Evolution is the gradual change in the alleles of a species over time to make it more suited to its environment. Natural selection is when certain members of a population have an advantageous allele making t...
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Answered by Hannah D. • Biology tutor
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Describe the necessity for a reflex action to occur when, for example, touching a hot surface (2)

A reflex action is much faster than a normal, conscious movement, which enables a person to remove themselves from a dangerous stimulus much faster, to reduce the damage which would be caused if a reflex was...
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Answered by Leo D. • Biology tutor
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