BSCI205 Midterm Review

BSCI205 Midterm Review - C Ecosystem Organization 1 Abiotic...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
C) Ecosystem Organization 1. Abiotic components: water, temperature, light, chemicals 2. Biotic Components: living components a. Autotrophs: primary producers i. Trees, algae, plants ii. Exhibit photosynthesis b. Heterotrophs: consumers i. Herbivores: only eat plants: rabbits, deer ii. Carnivores: eat meat/other animals: snakes, cats iii. Omnivores: eat both plants and animals: bears c. Decomposers: bacteria and fungi 3. Ecological succession: the replacement of one biological community with another a. Trends: when a community dies, another takes over b. Climax community: replaced by more of the same species c. Primary succession: occurs where life begins where there was no life before i. Lichens and mosses-grasses-shrubs-trees d. Secondary succession: life comes to a place where there was life before (all the vegetation has been destroyed) i. Are soil and nutrients there ii. Weeds-shrubs-trees How Ecosystems Maintain Stability (#3) A) Definition: a. The structure of an ecosystem persists over time b. Stability is maintained by constant change B) Only two variables: a. Energy b. Matter C) Open system: a. Definition: system in which energy and matter are exchanged with the surroundings that system is in b. Examples: An animal’s body D) Closed System: a. Definition: system in which energy but not matter is exchanged b. Example: the earth E) Stability is achieved by: a. Dynamic Steady State: IN AN OPEN SYSTEM i. What goes in is equal to what goes out ii. Our body is an example b. Dynamic Equilibrium: IN A CLOSED SYSTEM i. What goes in is equal to what goes out ii. The earth is an example
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
F) Homeostasis: steady state a. Homeostatic: the ability to maintain a constant state G) Systems controlled by feedback a. Feedback: the reaction of a system to change that in turn effects the pace of further change b. Negative Feedback: i. Minimizes change ii. Increases stability 1. Example: predator-prey relationship 2. Example: furnace (keeps temperature stable) c. Positive Feedback: i. Amplifies change ii. Decreases stability 1. Example: Snow on temperature 2. Example: in CO2 - in temp - in respiration - in CO2 The Movement of Energy Through Ecosystems (#4) A) Energy 1. Definition: the capacity to do work 2. Types of energy: mechanical, radiant, thermal, chemical, etc a. Calorie is used to measure energy 3. Two major forms: a. KINETIC: energy in motion i. Bouncing ball b. POTENTIAL: energy that is stored i. Fossil fuels ii. Water in a reservoir held by a dam iii. Food B) First Law of Thermodynamics: 1. Definition: takes energy to get energy, cannot be created or destroyed 2. Examples: a. Amount of energy in a gallon of gas = amount of energy released when that gas is burned C) Second law of Thermodynamics: (ENTROPY) 1. Definition: all energy transfers are inefficient and heat is always a byproduct of energy conversions 2. Examples: An engine will only heat up if you apply energy, but will spontaneously lose heat to cool down (no energy needed) D) The movement of energy through ecosystems
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 14

BSCI205 Midterm Review - C Ecosystem Organization 1 Abiotic...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online