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Describe how water is carried by the transpiration stream. (3 marks)

Transpiration is the loss of water from a plant by evaporation, which then diffuses out of the leaf via the stomata. It is important to note whether the student understands how and why water leaves the plant...
AS
Answered by Abishek S. • Biology tutor
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What are the risks and benefits concerning genetic modification of crops?

With the world population increasing exponentially, the concept of genetic engineering can be viewed as a sustainable way to feed people. Crops can be genetically modified to improve certain characteristics ...
AA
Answered by Alyssa A. • Biology tutor
5248 Views

Why are the lungs adapted for the rapid absorption of oxygen into the blood?

Oxygen is absorped into the blood by the process of diffusion. A large surface area, short diffusion pathway (the distance the oxygen has to travel through) and large concentration gradient increases the rat...
CP
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The drug Atropine blocks the action of of acetylcholine on structures innervated by post-ganglionic cholinergic neurones.

State precisely which part of the nervous system will be affected by atropine and suggest why atropine might be used during anesthesia. Answer: It acts on the parasympathetic branch of the autonomic nervous ...
RM
Answered by Rana M. • Biology tutor
4752 Views

Explain the adaptations of cacti to their environment

Extensive root systems allow for maximum uptake of available water from the ground. Low surface area to volume ratio reduces the rate of evapotranspiration, alongside a thick waxy cuticle covering the surfac...
LB
Answered by Lewis B. • Biology tutor
8841 Views