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Why might the stomata of a leaf close on a hot day?

Despite the fact that the stomata open in response to light, they may close on a hot day in order to conserve water. This is because the heat may cause the water to evaporate out through the stomata, causing...
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Answered by Rebecca D. • Biology tutor
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Compare the developmental and cognitive areas of Psychology in terms of their aims of study and the studies completed in them.

The developmental area of Psychology focuses on how behaviour changes over time, as a person grows up. It has a particular focus on behaviourism (the belief that all behaviour is learned). Meanwhile, the cog...
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Nitrogen reacts with hydrogen to produce ammonia. Calculate the mass of ammonia made from 84.0g of nitrogen.

(1) First, write out the equation if it is not given: N 2 + 3H 2 ---> 2NH 3 (2) Calculate the moles of nitrogen in the reaction using the information you have; in this case it is mass and relative formula...
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Answered by Thivya T. • Chemistry tutor
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What is a pathogen? and how does it cause disease?

Pathogens are microorganisms that cause disease. They may be bacteria, viruses, protists or funghi. They can infect animals and plants, causing a wide range of diseases. Pathogens, such as bacteria and virus...
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Answered by Hugh P. • Biology tutor
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I do not understand Le Chatelier's Principle - please help!

LeChaterlier's principle states: 'If a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium moves to counteract the change'. In short, this helps us to work out HOW changi...
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Answered by James S. • Chemistry tutor
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