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Biology; Chemistry; Physics: Post your doubts here!

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Khadija_1234

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Zoya Shahab said:
Traffic is two way in phloem vessels. Can anyone explain me how is it two way??? In which directions does food travel and why??
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It's two way because the phloem takes the food from the leaves to all parts of the plants, upwards, downwards and storage parts etc.
When we destarch a plant by keeping it in the dark or when it's not photosynthesizing, the starch is taken by the phloem from the storage organs to all parts of the plants, including the leaves in order to provide glucose for respiration
 
Osaid Zahid

Osaid Zahid

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Describe an experiment to measure the amperage of a battery ?

How would you do this.... Amps is charge per time right and you can't attach an ammeter directly because it has very low resistance ... So you need a resistor but the large the value of resistor the lower the amperage will be recorded.... So then what do you really mean if have if a battery has 1.5 Amps... And how do they measure that ?

I eventually figured it out... you would use a ohm metre and a volt meter ... the ohm meter will measure batterys internal resistence and voltage will be obtained from Volt metre... so we can divide for current.... :-D
 
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farhan141

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Osaid Zahid said:
Describe an experiment to measure the amperage of a battery ?

How would you do this.... Amps is charge per time right and you can't attach an ammeter directly because it has very low resistance ... So you need a resistor but the large the value of resistor the lower the amperage will be recorded.... So then what do you really mean if have if a battery has 1.5 Amps... And how do they measure that ?
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Aye Oye Osaid :D. Farhan Here :p
 
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Al-Anoud

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IGCSE Biology (.Q.) Why is it important to ventilate glasshouses by opening windows? (qs abt CO2 enrichment and concentration in green houses.
 
TheStallion-Reborn

TheStallion-Reborn

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Al-Anoud said:
IGCSE Biology (.Q.) Why is it important to ventilate glasshouses by opening windows? (qs abt CO2 enrichment and concentration in green houses.
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i dnt take igcse but mi guess would be (referring to CO2, as u stated) plants need oxygen for respiration and xtremely high levels of co2 will prevent plants from respiring
 
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Snowysangel

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Al-Anoud said:
IGCSE Biology (.Q.) Why is it important to ventilate glasshouses by opening windows? (qs abt CO2 enrichment and concentration in green houses.
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It allows a good supply of fresh air to enter and leave the plants. The buildup and reuse of the same carbon dioxide could damage the plant and hinder the process of photosynthesis, producing insufficient glucose/carbs. Oxygen needed for respiration must also be replaced by cleaner air from outside
 
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