Lecture notes
Food Chains, Food Webs, Genetic Enginnering and Natural Selection
This document provides information about food webs and food chains. Also, about Genetic Enginnering and Natural Selection.
[Show more]
Seller
Follow
Content preview
Food chains/webs:What is a food chain and what is a food web?
- A food chain is a linear sequence of organisms through which
nutrients and energy pass as one organism eats another.
- A food web consists of all the food chains in a single
ecosystem. Each living thing in an ecosystem is part of
multiple food chains. Each food chain is one possible path that
energy and nutrients may take as they move through the
ecosystem
Examples of food webs:
Primary Producers: Autotrophs such as plants, algae, and some
bacteria that convert solar energy into chemical energy through
photosynthesis.
Primary Consumers: Herbivores that eat primary producers.
Secondary Consumers: Carnivores and omnivores that eat primary
consumers.
Tertiary Consumers: Predators that eat secondary consumers.
Quaternary Consumers: Apex predators at the top of the food
chain that eat tertiary consumers.
, Decomposers: Organisms such as bacteria, fungi, and detritivores
that break down dead organic material, returning nutrients to the
environment.
Interactions:
● Predation: One organism feeds on another.
● Herbivory: Consumption of plants by animals.
● Parasitism: One organism lives on or in another organism,
causing it harm.
● Mutualism: Both organisms benefit from the interaction.
● Competition: Organisms vie for the same resources, such as
food or habitat.
What are producers?
They are organisms that make their own food. For example, they
can get energy from chemicals or the sun, and with the help of
water, convert that energy into usable energy in the form of sugar,
or food.
- The most common example of a producer is a plant.
What are primary consumers?
- Primary consumers are herbivores, feeding on plants or
algae.
- Examples of primary consumers are: Caterpillars, insects,
grasshoppers, termites and hummingbirds because they only
eat on autotrophs (plants).
The benefits of buying summaries with Stuvia:
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
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 HannahWq. 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)
72042 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
