Author Topic: Edexcel BIOLOGY Doubts!!!!  (Read 132306 times)

Offline lis111

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #630 on: January 21, 2012, 05:05:33 am »
Biology Unit 5 article jan 2012!!!! i dont knoe how 2 study 4 it .My exam is in 10 days !! :O

Offline Malak

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #631 on: January 21, 2012, 01:38:18 pm »
^ In the sample paper for unit 4 there is a question which asks for named organism lined to its habitat.

and thanks for the tips. :D
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Offline -Cornea

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #632 on: January 23, 2012, 02:31:18 pm »
When is unit 4 biology did they finish it :D
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Offline Malak

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #633 on: January 23, 2012, 02:52:03 pm »
Unit 4 is on 25th Jan
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Offline MKh

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #634 on: January 23, 2012, 03:22:52 pm »
^ In the sample paper for unit 4 there is a question which asks for named organism lined to its habitat.
and thanks for the tips. :D

I haven't got the sample paper, so can you please quote the exact question or take a snap of it?

Most welcome. You remind me of the days when I was preparing for my A2 Biology exams. Good Luck!


Offline Malak

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #635 on: January 23, 2012, 04:46:16 pm »
I haven't got the sample paper, so can you please quote the exact question or take a snap of it?

Most welcome. You remind me of the days when I was preparing for my A2 Biology exams. Good Luck!


Describe a technique that you have used to study the distribution of a named organism within its habitat.

^This one. You have to name an organism and also state its habitat.
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Offline MKh

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #636 on: January 23, 2012, 05:44:51 pm »
Describe a technique that you have used to study the distribution of a named organism within its habitat.
^This one. You have to name an organism and also state its habitat.

The most important aspect of this question is that u have to describe a technique that fits with the organism that you would like to study and its habitat as well.
So, for example, to study the distribution of grass in a park, you cannot say that you would use the pitfall trap technique (!) because the pitfall trap is used to capture arthropods and the number of arthropods captured in a unit area gives you an idea of the overall distribution of the a particular arthropod you wish to study. You would instead use the 'random sampling' method using quadrats to study the distribution of the grass.

Naming organism means you don't have to state the name of the species but you can simply state for example, you wish to compare the distribution of grass in a grazed and ungrazed area of a woodland.

You will get marks for showing an understanding of the particular techniques involved and how you use them to study the distribution of the organism(s) you wish to study.

Organism as in any living organism - you can state that you wish to study a particular insect, say, butterfly, or the whole insect population in, say, a woodland area.

Make sure the habitat that you mention seems suitable for the particular organism, for example, you cannot state that you wish to study the distribution of any sea creature, like the 'Flat Periwinkle' or 'common Limpet', in a local park (!) - you won't find any there.

This is actually Core Practical 1 in Edexcel A2 Biology - refer to the Student Sheets from the practical assessment guide.

Pitfall trap = to collect invertebrates
Sweep net = to collect invertebrates in long grasses
Pooter = to collect invertebrates into a container
Tullgren funnel = to collect organisms from soil or leaf litter
Baermann funnel = to collect living organisms from water
---> all these techniques are detailed in the Student sheets. Hope u have them.

Hope this helps.

Offline SZM

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #637 on: January 24, 2012, 08:02:08 am »
ALL THE BEST OF LUCK TO Angl31 and MKH for your upcoming exam on 2marow Biology Unit 4.

May ALLAH MAKE UR EXAM PAPER MUCH MORE EASIER. AMEEN.

STRIVE FOR YOUR EXCELLENCE. INSHA ALLAH  YOU WILL SUCCEED THE EXAM . AMEEN.

HOPE U MUST HVE STUDIED AND WORKED HARD.

WASALAAM.

Offline Malak

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #638 on: January 24, 2012, 04:55:46 pm »
^Thanks alot


Can anyone explain me Q7 b i and ii of this paper (attached)
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Offline Malak

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #639 on: February 02, 2012, 12:02:02 pm »
Why are tendons inelastic?
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Offline Nikita Eshrat

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #640 on: February 02, 2012, 12:09:17 pm »
So often times it happens that we live our lives in chains .And we never even know we have the key!
And most importantly, i shall also not be conquered :D !

Offline -Cornea

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #641 on: March 19, 2012, 12:19:04 pm »
iam doing unit 3 for the third time i really need to do well this time because i need 2 more  marks to score an A . In this examination session i got a c in unit 3 it's really tough although i don't find it hard i don't know where i go wrong any tips please :S
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Offline Deadly_king

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #642 on: April 01, 2012, 01:35:35 pm »
Why are tendons inelastic?

Tendons are parallel bundles of collagen that attach muscles to bones. Tendons are inelastic but flexible. Tendons concentrate the pull of the muscle on a small section of the bone. Some tendons are surrounded by a sheath. The tendon sheath is a tubular, double layer sac that contains synovial membranes and synovial fluid. Synovial fluid acts as a lubricant for the tendon. Achilles tendinitis is when the tendon rubs against the sheath and becomes swollen and inflamed, usually because of overuse or lack of synovial fluid. Lack of synovial fluid can be caused by poor diet.

Now if you want to know more about it, study about the features of collagen ;)

Offline Malak

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #643 on: April 07, 2012, 10:46:33 am »
^ that was a lot of detail :P

I have another confusion ::)

Describe how plants detect light using photoreceptors and how they respond to environmental cues.

I know the photoreceptor part but when it comes to responding to environmental cues i am confused.
Are they talking about tropisms (auxin and all that) or how phytochromes respond to the cues, e.g. germination etc. ?
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Offline Romeesa-Chan

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #644 on: April 07, 2012, 12:32:15 pm »
^ that was a lot of detail :P

I have another confusion ::)

Describe how plants detect light using photoreceptors and how they respond to environmental cues.

I know the photoreceptor part but when it comes to responding to environmental cues i am confused.
Are they talking about tropisms (auxin and all that) or how phytochromes respond to the cues, e.g. germination etc. ?

This might be useful:
http://www.slideshare.net/menmaatre.kiya/biology-notes-topic-8

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