BIOLOGY 2F03 Lecture Notes - Lecture 19: Evapotranspiration

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11 Dec 2015

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19 patterns of terrestrial primary production time. Primary production: the fixation of energy by autotrophs in an ecosystem. Rate of primary production: is the amount of energy fixed over some period of. Gross primary production: is the total amount of energy fixe by all the autotrophs in the ecosystem, independent of any costs associated with either energy fixation or basal metabolism of the organisms. Net primary production (npp): is the amount of energy left over after autotrophs have met their own energetic needs. Npp is gross primary production minus respiration by primary producers and is the energy available to the consumers in an ecosystem. In most systems, npp is the difference between photosynthesis and respiration. Trophic level: is a position in a food web and is determined by the umber of transfers of energy from primary producers to that level. Primary producers occupy the 1st trophic level since they convert inorganic forms of energy into (mainly light) into biomass.

Related Questions

please answer the following questions TRUE OR FALSE

1)sometimes succession occurs without any change in the species that compose a community

2) The difference between gross primary productivity and net primary productiviry is determined by the respiration of primary producers

3)The net primary productivity is usually more than 80% of gross primary productivity

4) The amount of net secondary productivity cannot exceed the amount of net primary productivity

5) because energy is lost during assimilation and production on;y less than 25% of the energy at one trophic level advances to the next trophic level

The total amount of energy invested in the production of living biomass in a community is that community's

Select one:

a. gross primary productivity

b. net primary productivity

c. gross photosynthetic efficiency

d. net photosynthetic efficiency

Which of the following factors accounts for the largest number of documented extinctions that have occurred in the last 1,000 years?

Select one:

a. Deforestation

b. Habitat fragmentation

c. Pollution

d. Invasive species

In terrestrial ecosystems, the greatest current cause of species endangerment is

Select one:

a. invasive species

b. habitat loss

c. overharvesting

d. pollution

Carbon dioxide has a warming effect on the earth's atmosphere. This is because it absorbs

Select one:

a. ultraviolet radiation coming from the earth's surface

b. visible light coming directly from the sun

c. ultaviolet radiation coming from the sun

d. infrared radiation coming from the earth's surface

The overall productivity of the open ocean has declined as a result of global warming.This is believed to be because

Select one:

a. ocean stratification has intensified

b. cloud cover has increased, reducing sunlight over the ocean

c. higher temperatures have directly inhibited algal photosynthesis

d. the amount of carbon dioxide dissolved in the ocean has decreased

Positive feedback might occur in response to increasing atmospheric carbon dioxide levels as a result of

Select one:

a. soil decomposers increasing the rate at which they break down organic molecules

b. oceans absorbing more carbon dioxide in the form of bicarbonate ions

c. an increase in the rate at which fossil fuels are formed

d. plants accelerating their growth by taking up more carbon dioxide

Which nitrogen-containing molecules in soil represent a usable source of nitrogen for plants?

Select one:

a. Nitrogenous bases of nucleic acids

b. All of these

c. Ammonium

d. Amino acids

In a tropical forest ecosystem, "edgeâ habitat is considered to be of relatively low quality for conservation purposes because it

Select one:

a. tends to contain more invasive species

b. all of these

c. tends to contain more early-successional species

d. is more exposed to the effects of wind

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BIOLOGY 2F03 Lecture Notes - Lecture 19: Evapotranspiration

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