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Water and Biogeochemical Cycles

Total questions: 29

Worksheet time: 12mins

Name
Class
Date
1.
The process of plants losing water through their leaves is called ____.
a)
condensation
b)
evaporation
c)
transpiration
d)
exhaling
2.
What is the most abundant gas in the atmosphere?
a)
hydrogen
b)
oxygen
c)
helium
d)
nitrogen
3.
Why do living things need nitrogen?
a)
To get energy
b)
To make amino acids
c)
To make proteins
d)

To make proteins AND nucleic acids

4.
Where are nitrogen-fixing bacteria found?
a)
In the soil
b)

Plant Roots

c)
In dead things
d)
In the atmosphere
5.
What happens during the process of nitrogen-fixation?
a)
Nitrogen compounds turn into free nitrogen
b)
Free nitrogen turns into nitrogen compounds
6.
Which is NOT a way that nitrogen compounds are added to the soil?
a)
Decay of dead organisms
b)
Denitrification
c)
Animal waste
d)
Nitrogen-fixation
7.
What is the only process that removes carbon from the atmosphere?
a)
combustion
b)
cellular respiration
c)
photosynthesis
d)
decomposition
8.
What 2 things does a plant make during photosynthesis?
a)
oxygen, glucose
b)
glucose, carbon dioxide
c)
useable energy, glucose
d)
oxygen, carbon dioxide
9.

What happens when water evaporates?

a)

It changes from a gas to a solid.

b)

It changes from a solid to a liquid.

c)

It doesn't change, it just moves from one environment to another.

d)

It changes from a liquid to a gas.

10.

What happens when there is more water than the air can hold?

a)

The water turns into vapor and rises up.

b)

The water falls to the ground as precipitation.

c)

The water evaporates and turns into clouds.

11.

Photosynthesizing plants affect the carbon cycle by...

a)

Creating more carbon atoms

b)

Reducing the amount of carbon in the soil

c)

Absorbing CO2 from the atmosphere, lowering atmospheric levels of carbon

d)

None of the above; plants do not affect the carbon cycle

12.

The burning of fossil fuels contributes to the carbon cycle in what way?

a)

Increases the amount of CO2 in the atmosphere

b)

Increases the amount of O2 in the atmosphere

c)

Decreases the amount of CO2 in the atmosphere

d)

Decreases the amount of O2 in the atmosphere

13.

Which type of organism performs nitrogen fixation?

a)

Bacteria

b)

Viruses

c)

Humans

d)

Plants and phytoplankton

14.

Plants obtain nitrogen through photosynthesis.

a)

True

b)

False

15.

Examples of decomposers include:

a)

humans, dogs, and whales

b)

trees, tomato plants, and phytoplankton

c)

viruses

d)

fungi and bacteria

16.

Phosphorous helps the make-up of what cell part?

a)

Chloroplasts

b)

Mitochondria

c)

Cell membrane

d)

Ribosomes

17.

Which nutrient(s) are what we call "limiting nutrients"?

a)

Phosphorous

b)

Carbon

c)

Glucose

d)

Nitrogen

18.

Hydrogen Bonds typically occur between atoms of hydrogen involved in this type of bond:

a)

Ionic

b)

Nonpolar Covalent

c)

Polar Covalent

d)

Nonpolar AND Polar Covalent

19.

Hydrogen bonds are VERY important in determining the many properties of this very important molecule

(a)  

20.

The Oxygen atoms in the molecule shown have this charge:

a)

Positive

b)

Partial Positive

c)

Negative

d)

Partial Negative

21.

The Hydrogen atoms in the molecule shown have this charge:

a)

Positive

b)

Partial Positive

c)

Negative

d)

Partial Negative

22.
What word describes when water is attracted to other substances?
a)
cohesion
b)
adhesion
c)
capillary action
d)
surface tension
23.
Which of the following is LEAST likely to dissolve in water?
a)
nonpolar fats and oils
b)
polar sugar molecules
c)
salt made of a positive sodium ion and a negative chloride ion
d)
all of the substances will dissolve easily in water
24.
Large bodies of water, such as lakes and oceans, do not quickly fluctuate in temperature. What is the reason for this phenomenon?
a)
Water is an acid.
b)
Water is a versatile solvent.
c)
Water has a high heat capacity.
d)
 Water acts as a buffer.
25.
Why does ice stay at the top of oceans instead of sinking to the bottom?
a)
 Ice is colder than liquid water.
b)
Ice is less dense than liquid water.
c)
Ice is more dense than liquid water.
d)
Ice is warmer than liquid water.
26.

Water molecules stick together forming a "skin" on water known as ______ _________ allowing light objects to float.

a)

hydrogen bonding

b)

opposites attract

c)

surface tension

d)

polar molecule

27.
Identify the components involved in the carbon cycle above ground.
a)

Sun

b)

Trees

c)

Animal Respiration

d)

Plant Respiration

e)

Burning Fossil Fuel/Emissions

f)

Dead Organisms

g)

Fossils and Fossil Fuels

1
2
3
4
5
6
7
1)
2)
3)
4)
5)
6)
7)
28.

What is the primary way carbon is released into the atmosphere from fossil fuels?

a)

Photosynthesis

b)

Combustion

c)

Respiration

d)

Decomposition

29.

Which process in the carbon cycle involves the conversion of carbon dioxide into organic compounds by plants?

a)

Respiration

b)

Photosynthesis

c)

Decomposition

d)

Combustion

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