3 Plant Nut & Tran Nor

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    Unit 3: 22.03 Plant Nutrition and

    Transport

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    How do plants get their food ?

    The soil was watered but nothing else was added. After 5 years, the

     tree had gained 74kg in weight but the soil had lost only 52g.

     van Helont !on!luded that the tree had ade 74kg of new growth

    fro water alone.

    "#.72kg soil

    $n the %7th &entury, A 'elgian physi!ian, van Helont, set up an

    e(perient in whi!h he planted a willow sapling in a weighed

    aount of soil.

    "#.2#kg

    soil

    )o *ow +ead  write an e(plaination of where the

    74 -g new growth !ae fro.

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    van Helmont’s experiment was efective in showing that the plant’s

    ood did not come rom the soil. But he had overlooked the act that air 

    was available to the plant as well as water.

    Could it be that the plant made 74kg o material rom ust air and water!

     "his might seem unlikel# but we now

    know that plants do indeed make their ood rom carbon dioxide rom the air and water rom the soil.

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    Photosynthesis

    / $h# is it important!  0 %ood! &eges and 'eat! $here’d it come

    rom!

     0 'edicines!

     0 Habitats

     0 (tmospheric )ases

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    Plant cells

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    Lesson 1: Learning Obecti!es

    /  "o be able*

    +. ,e-ne photos#nthesis and state the euation in either words or s#mbols

    /. ,e-ne the term limiting actor

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    "i#s $or Today

    /  "o be able to de-ne photos#nthesis using words and s#mbols

    /  "o de-ne the term limiting actor/ 01% Collins 2g. 4+344

    'ac ean 2g 56 3 46

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    Turning energy into $ood

    / unlight is the ultimate energ# which is turned into ood.

    / 8nl# plants can trap light and convert it into chemical energ# 9 autotrophs

    / 8rganisms that can’t make their own ood are heterotrophs and rel# on producers :directl# or indirectl#; or (

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    / %hlorophyll :in the chloroplasts o the lea; absorb the light energ#

    / %arbon &io'ide difuses into the leaves rom the air

    / (ater is absorbed b# the roots rom the soil

    )aw *aterials $or Photosynthesis

    %opy down notes

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    %hlorophyll

    / Chloroph#ll is a green pigment in the chloroplasts o plant cells

    / %hlorophyll absorbs light energy  and enables it to be used to drive the

    reactions o photos#nthesis

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    %hloroplast

    How do the reactants get

    into the chloroplasts?

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    Photosynthesis +notes,

    / 2hotos#nthesis is the process that builds glucose molecules out o water and carbon dioxide using light energ#

    which is absorbed b# chloroph#ll. $ater = Carbon dioxide )lucose = 8x#gen

    6H/8 = 6C8/ C6H+/86 = 68/ 

    chlorophy

    ll

    chlorophy ll

    What is happening to the reactants to change them into the products?

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    Photosynthesis - Products

     "he glucose made b# the chloroplast is either

      :a; used to provide energ# or the cell :b# respiration; or protein s#nthesis.

      :b; turned into sucrose and transported toother parts o the plant   or

      :c; turned into starch and stored in the cell

    as starch grains   >n darkness the starch is changed back into

    glucose and transported out o the cell

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    Photosynthesis

    /  "his is a series o en?#me3controlled reactions

    / $hat have we learnt about en?#mes so ar!

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    )ate o$ Photosynthesis

    /  "he rate o photos#nthesis could be measured b# how much glucose is made in a given time

    / $hat sort o things would afect the rate o photos#nthesis! :1n?#mes@@@;

    / How else could #ou measure rate o photos#nthesis! :BrieA# design an experiment to measure this rate;

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     Photosynthesis - u##ary

    $ater = Carbon dioxide )lucose =

    8x#gen chlorophy

    ll

    sunlight

    Write a sentence for each question to explain in as much detail as you

    can:

    1. how the reactants get into the chloroplasts,

    2. what happens to the reactants to change them into the products

    3. what happens to the products  where are they used and how? 

    where do they go?

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    /o#ewor 

    / 0ead 2g. 4+344 Collins.

    / Cop# the diagram "he raw materials and products in a plant D make it neat@ (nd at least E a page.

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    &ollins 1g 42

     things that !an happen to glu!ose after it is ade during photosynthesis

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    23.03 &o Now

    +. $rite a ull balanced chemical euation or photos#nthesis showing all that reuired.

    /. How is glucose stored in a plant D explain ull# wh# is it not directl# stored as glucose.

    5. Fame 5 other things that can happen to glucose ater it is made during photos#nthesis!

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    Lesson 2: Learning Obecti!es

    /  "o be able to*

    +. Carr# out an experiment to show the need or chloroph#ll and light in photos#nthesis

    /. $e are going to use a varigated plant to show the need or light and chloroph#ll in photos#nthesis. "he plant has been destarched b# leaving in the dark or +/

    hrs. 5. ,raw a picture o #our lea’s green and

    white marks

    4. $rite up experiment in exercise book.

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    tarch test with a lea$  ee *acean Pg 3-3

    / >t is diGcult to see a colour change or presence o starch when the lea is

    green so

    / Chloroph#ll can be dissolved b# alcohol so the

    lea becomes white. / Boil the alcohol and lea in a

    water bath.

    /

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    / $as starch present in all areas o the lea! How can #ou tell!

    / 1xplain wh# there were areas o the lea where starch was not ound.

    / /o#e wor 0ead 'acean 2g 5I to 5J ,o uestions + 3 7

    tarch test with a lea$ 

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    24.03 &o now 5 #ins

    / 1xplain the ob o chloroph#ll during photos#nthesis.

    / 1xplain what happens to the ox#gen that is produced in photos#nthesis.

    / How do plants use some o the ox#gen given of during photos#nthesis.

    / $hat structures within the lea cells contain chloroph#ll.

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    Lesson 3: Learning Obecti!es

    /  "o be able to*

    +.>nterpret the efects o light intensit#K carbon dioxide concentration L

    temperature on photos#nthesisK so describing the limiting actors.

    /.1xplain the use o carbon dioxide enrichmentK optimum light and optimum

    temperatures in greenhouse s#stems.  0 01% Collins 2g. 45

    'acean 2g 4+ 34/

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    Li#iting 6actors

    /  "hings that afect the rate o photos#nthesisK like lightK are called limiting actors. "he actor that is present

    in the least  amount starts to limit the rate o photos#nthesis. 8nl# one actor can limit the rate o photos#nthesis at an# one time D it depends on what is in

    the shortest suppl# eg. water or carbon dioxide or temperature or light intensit#.

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    / > #ou plot the rate o photos#nthesis against the levels o these three limiting actors #ou get graphs like the ones below.

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    7reenhouses

    / )reenhouses can provide optimum conditions to maximise the rate o photos#nthesis. 1ver# plant will have

    an optimum temperature or growth.  "he greenhouse is usuall# enriched with carbon dioxide gas and optimum

    light intensities.

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