chemmatters tg oct2015 hydroponics

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October/November 2015 Teacher's Guide for

Dirt? Who Needs It? How HydroponicsIs Poised to Change the World

Table of Contents

About the Guide...............................................................................................................

tudent !uestions...........................................................................................................Ans"ers to tudent !uestions......................................................................................Antici#ation Guide...........................................................................................................$eadin% trate%ies..........................................................................................................&ac%round (nformation.................................................................................................Connections to Chemistr) Conce#ts..........................................................................*ossible tudent +isconce#tions...............................................................................Antici#atin% tudent !uestions...................................................................................(n,Class Activities..........................................................................................................Out,of,Class Activities and *ro-ects............................................................................$eferences......................................................................................................................eb ites for Additional (nformation..........................................................................

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About the Guide

Teachers Guide editors William Bleam, Regis Goode, Donald McKinne, Barbara !it"man andRonald Tem#est created the Teachers Guide article material. $%mail& bbleam'(eri"on.net

!usan )oo#er #re#ared the antici#ation and reading guides.

*atrice *ages, ChemMatterseditor, coordinated #roduction and #re#ared the Teachers Guide.$%mail& chemmatters'acs.org

Articles +rom #ast issues o+ ChemMatterscan be accessed +rom a DD that is a(ailable +romthe American )hemical !ociet +or -. The DD contains the entire 01%ear #ublication o+ChemMattersissues, +rom 2ebruar 3450 to A#ril 130.

The ChemMatters DD also includes Article, Title and Keword 6nde7es that co(ers all issues+rom 2ebruar 3450 to A#ril 130.

The ChemMattersDD can be #urchased b calling 3%511%8%9995.

*urchase in+ormation can be +ound online at www.acs.org/chemmatters.

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!tudent :uestions

3. What is the #redicted #o#ulation o+ the world in 101; Wh is this im#ortant;. What is hdro#onics;0. What is the #er cent com#osition o+ most #lants;

. What is the source o+ nutrients +or #lants that are grown hdro#onicall;9. hdro#onics?;8. What is the di++erence between macronutrients and micronutrients;5.


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Answers to !tudent :uestions

1. hat is the #redicted #o#ulation of the "orld in 200 h) is thisim#ortantThe article says the predicted world population in 2030 is 89 billion. The reason this is

important, according to the article, is that the land aailable !or agriculture may not besu!!icient in 2030 to ade"uately !eed that population.

2. hat is h)dro#onics#$ydroponics is the agricultural techni"ue o! growing plants in water instead o! soil.%

. hat is the #er cent com#osition of most #lantsThe article says that most plants are made up o! #&2' water, 2(' organic material and ('inorganic material, such as nitrogen and phosphorus.%

. hat is the source of nutrients for #lants that are %ro"nh)dro#onicall)The nutrient source !or hydroponic plants is a water solution containing the chemicalnutrients )ions* that plants re"uire !or growth.

5. Name the t"o main chemicals needed for #lant %ro"th.

Carbon dio+ide and water are the essential chemicals !or plant growth.. ho first introduced the term 3h)dro#onics4

illiam -erice, a scientist woring at the /niersity o! Cali!ornia, ereley in the 1930s !irstcoined the term.

. hat is the difference bet"een macronutrients andmicronutrients

ccording to the article, macronutrients are those chemicals that plants need in largeamounts, while micronutrients are needed in smaller amounts.

6. Name three #lant macronutrients.otassium, nitrogen, phosphorus, and calcium are the plant macronutrients listed in thearticle.

7. hat solution condition is crucial for ade8uate deliver) of

nutrients to #lantsThe p$ o! the solution is the condition important !or nutrient deliery.

10. 9ist t"o dra"bacs to %ro"in% h)dro#onic #lants: and one "a)these can be minimi;ed.-rowing plants hydroponically re"uires a light4controlled enironment and water must !lowconstantly through the system, both o! which are energy4intensie. 5ne way to minimi6e thisimpact is to use solar panels )possibly as both the source o! light and o! energy to pump thewater*.

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Antici#ation Guide

Anticipation guides help engage students by activating prior knowledge and stimulating studentinterest before reading. If class time permits, discuss students responses to each statement before

reading each article. As they read, students should look for evidence supporting or refuting their

initial responses.

Directions: Before reading, in the first column, write A! or ",! indicating your agreement or

disagreement with each statement. As you read, compare your opinions with information from

the article. In the space under each statement, cite information from the article that supports orrefutes your original ideas.

Me Text Statement

#. $ydroponics is the fast growing field in agriculture.

2. %eople have been growing plants without soil for about a hundred years.

3. &he solutes in a hydroponic solution include nutrients such as copper,calcium, and potassium.

4. %lants re'uire only sunlight and water to grow.

(. &he nutrients plants need in small amounts are called micronutrients.

). &he p$ of a hydroponic solution should be slightly basic.

*. Ions that have precipitated out of solution are unavailable cannot be taken up

by plant roots.

+. ost people can easily taste the difference between hydroponically grown

tomatoes and those grown in soil.

-. &he term hydroponics! was coined by alt "isney for the hydroponicgarden at "isney orlds /pcot &hem %ark.

#0. $ydroponic farms re'uire a lot of energy to maintain.

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Reading !trategies

&hese graphic organi1ers are provided to help students locate and analy1e information from the

articles. tudents understanding will be enhanced when they eplore and evaluate the

information themselves, with input from the teacher if students are struggling. /ncourage

students to use their own words and avoid copying entire sentences from the articles. &he use ofbullets helps them do this. If you use these reading strategies to evaluate student performance,

you may want to develop a grading rubric such as the one below.

ScoreDescriptio

nEvidence

4 /cellentomplete5 details provided5 demonstrates deep

understanding.

3 6oodomplete5 few details provided5 demonstrates

some understanding.

2 7air Incomplete5 few details provided5 somemisconceptions evident.

# %oor 8ery incomplete5 no details provided5 many

misconceptions evident.

09ot

acceptable

o incomplete that no :udgment can be made

about student understanding

Teaching Strategies:

#. ;inks to Common Core Standards for Reading&.-=#0.(< Analy1e the structure of the relationships amongconcepts in a tet, including relationships among key terms ?e.g.,force, friction,reaction force, energy@.

#.#0 /;A=;iteracy.>&.##=#2.4< "etermine the meaning of symbols, key

terms, and other domain=specific words and phrases as they are used in a specificscientific or technical contet relevant togrades 11-12 texts and topics.

2. ;inks to Common Core Standards for Writing

chemmatters tg oct2015 hydroponics

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