100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
Previously searched by you
If you're struggling with aqa a level biology you NEED these questions aqa biology exam questions with mark scheme a level biology help A* biology questions help in getting an A* in biology£7.49
If you're struggling with aqa a level biology you NEED these questions aqa biology exam questions with mark scheme a level biology help A* biology questions help in getting an A* in biology
in this bundle there are more than 5000 aqa a level biology questions and if you do every question and memorise the mark scheme you will get that A* without a doubt
1. Answers should be written in continuous prose. Credit will be given for biological accuracy; the
organisation and presentation of the information and the way in which the answer is expressed.
Read the following passage.
Photosynthesis takes place in the chloroplasts. These are disc-shaped organelles surrounded by
an outer envelope consisting of two layers of membrane. Inside, there are further membranes
which are arranged in stacks called grana. Surrounding these is the stroma. Chlorophyll and
other light- capturing pigments are found on the membranes of the grana and it is here that the
light-dependent reaction takes place. This generates the ATP and reduced NADP which are used
in the light-independent reaction in the stroma.
(a) (i) Describe the way in which ATP and reduced NADP are produced in the light-
dependent reaction of photosynthesis.
3. The island of Surtsey was formed in 1963 by a series of volcanic eruptions. Biologists have
studied the colonisation of this new island by plants and animals.
(a) The graph shows the number of species of plants found on the island each year for the
first seven years of its existence.
16
14
12
10
N um ber
o f s p e c ie s 8
6
4
2
0
1963 1964 1965 1966 1967 1968 1969 1970
Y ear
The development of the plant community on Surtsey illustrates the process of succession.
Explain why:
(i) very few species could grow on the island in the first few years after it was formed;
(b) Animals also colonised Surtsey. One conclusion drawn from studying them was that
particular species of animals found here had broader ecological niches than they did on
the nearby mainland. Suggest why.
4. Answers should be written in continuous prose. Credit will be given for biological accuracy, the
organisation and presentation of the information and the way in which the answer is expressed.
Read the following passage.
The living state requires a constant input of energy, and the most fundamental difference
between animals and plants is the way they obtain their energy. Animals take in food - organic
compounds - and release chemical energy during respiration; green plants absorb light energy
from the sun, converting it to chemical energy in the process of photosynthesis.
Source. adapted from RIDGE.I.(ED), Plant Physiology (Hodder and Stoughton, 1991)
(a) Describe how plants absorb light energy from the sun and use this energy to produce
useful substances in the light-dependent stage of photosynthesis.
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller ainhoa1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £7.49. You're not tied to anything after your purchase.
