100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Summary and Model answers on the topic: Biodiversity for Biology A-Levels £2.99   Add to cart
Quickly navigate to
Preview
  2.  
  3. OCR
  4.  
  5. Biology
  6.  
  7. Biodiversity

Summary

Summary and Model answers on the topic: Biodiversity for Biology A-Levels
 7 views  0 purchase
  • Institution
  • OCR

This doc includes summaries and model answers for common questions asked regarding this topic. This was what I used to study for my A-Levels in 2023.

Preview 1 out of 3  pages

Document information

  • January 16, 2024
  • 3
  • 2023/2024
  • Summary

Subjects

Written for

All documents for this subject (2)

Seller

avatar-seller
kanupreetkaur2019

Content preview

CH 18 - Biodiversity
Q. Explain how variation in ecosystem lead to biodiversity?
– Different habitats
– Different niches
– Many different species —> species diversity
– Genetic variation in each species
– Different selection pressures
– Therefore they adapt

Q. Explain why it is important to control invasive alien species.
– compete with native species ;
– for, food / same niche / light / resources
– feed on / predators of, native species ;
– can cause extinction in native species ;
– can breed more successfully than native species ;
– often have no, natural predator / grazers ;
– may disrupt, habitats / ecosystems / food webs / food chains
– cause reduction in biodiversity ;
– May introduce diseases

Niche : a role of an organism in an ecosystem
Biodiversity :
● Variation in ecosystems or habitats
● Number of species and their relative abundance (species density)
● Genetic Variation within each species
Biological Species concept : a group of organisms with similar morphology
and physiology, which can breed together to produce fertile offspring and are
reproductively isolated from other species
● Problems :
○ Cannot determine for asexual organisms
○ For fossil/extinct organisms
○ Often not possible to observe reproductive behaviour
○ time required for mating behaviour may take too long (to be

observed)
Morphological Species Concept: a group of organisms that share many
physical features that distinguish them from other species
Ecological Species Concept : When there is a population of similar organisms
living in the same area at the same time, they can be described as an
ecological species

Threats to the biodiversity of aquatic ecosystems
1) overfishing, example of overexploitation of resources, fishing younger fishes
therefore taking away population that has yet to breed

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

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

Quick and easy check-out

You can quickly pay through credit card for the summaries. There is no membership needed.

Focus on what matters

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 kanupreetkaur2019. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £2.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

83100 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now

Start selling
£2.99
  • (0)
  Add to cart