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What is the difference between xylem and phloem?

Plants have both xylem and phloem. The xylem is a tube which runs from the very ends of the roots to all other parts of the plant. Xylem transport water and minerals around the plant . Xylem are tough- they ...
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Answered by Britannie E. • Biology tutor
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A bag contains only apple and oranges. The probability an apple is picked randomly is 1 in 5. The apple is returned, and five more apples are added to the bag. The probability of an apple being picked is now 1in 3. How many apples were there originally?

2 simultaneous unknown equations. Let x be the number of apples originally, and n the number of fruits in the bag in total originally. i) first scenario, where probability is 1/5, x/n = 1/5 5x= n ii) second ...
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Answered by Chloe L. • Maths tutor
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Describe how a nerve impulse travels from neurone A to neurone B.

As an action potential arrives at A (the presynaptic terminal), pre-formed vesicles containing a chemical neurotransmitter fuse with the presynaptic membrane, releasing the chemical neurotransmitter into the...
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Answered by Medani E. • Biology tutor
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solve this simultaneous equation: 2x + 3y = 19 (Eq1) and 3x + y = 11 (Eq2)

Begin by multiplying the second equation by three in order to get a 3y value: 9x + 3y = 33. We can now subtract equation one from equation two, 9x + 3y = 33 and 2x + 3y = 19 -->7x + 0y = 14. Resulting in,...
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Answered by Tomas B. • Maths tutor
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In the flowing equitation 2H2+O2→2H2O how many grams of oxygen are needed to make 9g of water?

2H 2 +O 2 ->2H 2 OThe best way to answer any mass balancing questions like this is to set the information in a table as follows and fill in the blanks: 2H 2 + O 2 -> 2H 2 OMass ? 9gMr Moles 1. The firs...
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