Qualification > Sciences

Edexcel BIOLOGY Doubts!!!!

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Ibiza279:

--- Quote from: kim on June 07, 2010, 10:29:32 pm ---haha lol
nice
okay now me going to sleep have to wake up in about 7 hours lol
ok good night and Allah Hafiz

--- End quote ---

well takecare good nite sweet drms, n all the best fer tomorrow ! :)

haris94:
can some1 pls tell me the difference between collenchyma and sclerenchyma

Thanks

nid404:
Collenchyma- tissues found in the leaves, young stems and below the epidermis. Specialized cells- It consists of elongated cells with irregularly thickened walls. They are living.

Sclerenchyma- They are found in the mature parts of the plants and are dead at maturity. They have thick lignified walls and are impermeable to water and nutrients. They are specialized for transport of water and nutrients.

MKh:
hey guyz...i hav a qn in Bio A2 unit 6b:
what is meant by a null hypothesis?? ???

Deadly_king:

--- Quote from: MKh on October 12, 2010, 09:02:50 pm ---hey guyz...i hav a qn in Bio A2 unit 6b:
what is meant by a null hypothesis?? ???

--- End quote ---

The null hypothesis is often the reverse of what the experimenter actually believes; it is put forward to allow the data to contradict it.

So according to the experiment carried out, you should state a hypothesis which you'll contradict through the experiment. Hence you'll observe that indeed the null hypothesis is wrong.

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