[laurenmarie123]

Hello everyone,

I am new to the student room so I hope I am posting this in the right place.
How is everyone feeling about the B7 exam on Tuesday and could anyone help me with some topics I am struggling on? Also, what possible questions have you revised for the ideas in context on Alien Invaders?

Thank you.

[VineshS]

1. What is meant by the term biodiversity?
2. Other than introduction of an “alien invader” state 3 other threats to biodiversity.
3. Name 3 invasive species mentioned in the text.
4. If 600 alien invasive species were identified in Europe 30 years ago, and the number has increased by 75% since then, how many alien invasive species are there now?
5. Suggest how the Harlequin ladybird is threatening biodiversity in Europe.
6. Make a conclusion based on the data shown in the map diagrams.
7. Suggest how the data in the map diagrams may have been collected.
8. Make a comment about how reliable you think the data in the diagram might be.
9. Name another disease for which a mosquito is a vector.
10. Explain why most people in the UK would not be immune to the virus carried by the Asian tiger mosquito.
11. Viruses are pathogens. Name two other types of micro-organisms that can cause disease.
12. Scientists think that increased international travel might be causing the spread of the Asian tiger mosquito. Suggest how climate change might also contribute to the spread of the mosquito.
13. Below is a food chain including a ladybird species.
oak leaf → greenfly → ladybird → robin → sparrowhawk
a. Which organism can be described as an autotroph?
b. Which organisms can be described as carnivores?
c. Which is the secondary consumer?
d. Sketch a pyramid of numbers for the food chain above.
e. Energy is lost at each stage of the food chain. State 2 ways energy is lost.
14. Explain the term ‘biological control’.
15. Ladybirds have been used as a method of biological control by farmers. Why do some farmers prefer to use this method as opposed to pesticides?
Japanese knotweed is difficult to eradicate because it can spread underground by putting out rhizomes (shown in the diagram). This is a form of cloning. Explain what is meant by the term ‘clone’.

THease are the questions my teacher gave me

[laurenmarie123]

Thank you, obviously there won't be that many on the actual exam.

Have you learnt everything on B7 not including the ideas in context?

[Issy_W]

Do you have any of the answers from those questions? Thanks!

[lilalex]

1) the em biodiversity means that amount of organism living in one habitat

[lilalex]

*term not em

[lilalex]

13. Below is a food chain including a ladybird species.
oak leaf → greenfly → ladybird → robin → sparrowhawk
a. Which organism can be described as an autotroph?
b. Which organisms can be described as carnivores?

answer
a - the plant is the autotroph(producer)
b - the ladybird,robin and sparrowhawk are the carnivores

[lilalex]

c. Which is the secondary consumer?

e. Energy is lost at each stage of the food chain. State 2 ways energy is lost.

14. Explain the term ‘biological control’.

15. Ladybirds have been used as a method of biological control by farmers. Why do some farmers prefer to use this method as opposed to pesticides?

answers

c - ladybird (second consumer)
e- by respiration, movement, growth- energy and repair any of these
14- biological control is using natural products including insects and animals to control the problem compared to using synthetic chemicals that can harm other food chains.
15- it is more natural and it doesn't harm the plant

hope this is helping and good luck tomorrow i have mine two

[AmyLD]

How did people find it?

[ellepotter]

I thought it was okay, I was quite surprised at the amount of written questions though- no classic 21st century science tick boxes!

[laurenmarie123]

I'm super confident!

[lilalex]

all the stuff i revised came up in the exam im super happy