head 1.1; access; symbols; locks; strict; comment @# @; 1.1 date 2017.10.30.11.10.09; author root; state Exp; branches; next ; desc @This document (Lesson: 3 Let's make an ecosystem) is re-created by administrator on 25 August 2017 @ 1.1 log @Initial revision @ text @{ "_id": { "$oid": "59b6709c2c4796014bf311bf" }, "_type": "GSystem", "access_policy": "PUBLIC", "altnames": "Lesson: 3 Let's make an ecosystem", "annotations": [], "attribute_set": [], "author_set": [ 1 ], "collection_set": [], "comment_enabled": null, "content": "

Let's make an ecosystem

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The next hour and so we will spend on setting up a small aquarium. It will slowly turn it into an artificial aquatic ecosystem.

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This activity will be done in a group. Your teacher will help you break into groups.
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Material for set up

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Transparent plastic bottle -    one per group                                                                                                       (empty water or cold drink bottles can be used for this purpose)

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Scissors or a thick cutter   (to cut the plastic bottle)

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Measuring cups:     you can collect small measuring cups that come with children\u2019s medicine and syrup.

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Artificial Manure:  solutions will be provided to your school.

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\r\nImportant - make sure that every team uses the bottle of the same volume.

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Most important: to avoid any accidents, your teacher will cut the bottle for you.
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Steps:

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    Wash the bottle properly so that no dirt or any material remains there. Measure the bottle 17 cm from the bottom and make a round mark at this height.

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    Take the help of your teacher to cut the bottle at the mark.

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    3. \r\n
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Preparing your aquatic ecosystem

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\r\nPlease fill the bottle up to 12 cm of height using tap water.
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\r\nAs you already know you need biotic and abiotic components in an ecosystem. You already have an abiotic component in your bottle.
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\r\nWhich is that?
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\r\nGet a cup of water from pond, stream or puddle. Measure just 50 ml using measuring cups and pour it into your bottle.
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Why have we got this water?

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\r\nWater from the natural water bodies such as pond, stream or puddle will contain many biotic components such as different kinds of micro organism and help in setting up of our system.
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\r\nOnce you have done that please mark the name of your team on the bottle.

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Team A                   

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This team will use paper (you can also use newspaper, black chart paper etc.) to cover your bottle from outside so that no sunlight reaches the water.

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Team B

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Will add a pinch of artificial manure or urea solution to the water.

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Team C

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 Will not add any manure to the water or cover the bottle with paper. 

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\r\n\"Team\"  \"Team\"        \"Team\"\r\n


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\r\nPlease keep your ecosystem near a window where there is enough sunlight. Now you need to go for long-term observation.
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What to observe

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As you know in order to call your bottle an ecosystem it needs to have both abiotic and biotic factors. You already have abiotic factors - Water, Sunlight, Air, Urea or Manure. You need to wait till biotic factors appear in it. Make observation as given in activity 3.1

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Discussion 

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Could you call this an ecosystem? If so Why?
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\r\nWill you call it a man-made ecosystem or a natural ecosystem?

\r\n", "content_org": "

Let's make an ecosystem

\r\n \r\n\r\n

The next hour and so we will spend on setting up a small aquarium. It will slowly turn it into an artificial aquatic ecosystem.
\r\n 
\r\nThis activity will be done in a group. Your teacher will help you break into groups.
\r\n 
\r\n 
\r\nMaterial for set up
\r\nTransparent plastic bottle (empty water or cold drink bottles can be used for this purpose) - one per group
\r\n
\r\nScissors or a thick cutter (to cut the plastic bottle)
\r\n
\r\nMeasuring cups: you can collect small measuring cups that come with children\u2019s medicine and syrup.
\r\n
\r\nArtificial Manure: solutions will be provided to your school.
\r\n 
\r\nImportant - make sure that every team uses the bottle of the same volume.
\r\n 
\r\nMost important: to avoid any accidents, your teacher will cut the bottle for you.
\r\n 

\r\n\r\n

Steps:

\r\n\r\n
    \r\n\t
  1. \r\n\t

    Wash the bottle properly so that no dirt or any material remains there. Measure the bottle 17 cm from the bottom and make a round mark at this height.

    \r\n\t
    2. \r\n\t
  2. \r\n\t

    Take the help of your teacher to cut the bottle at the mark.

    \r\n\t
    3. \r\n
\r\n\r\n

Preparing your aquatic ecosystem

\r\n\r\n

 
\r\nPlease fill the bottle up to 12 cm of height using tap water.
\r\n 
\r\nAs you already know you need biotic and abiotic components in an ecosystem. You already have an abiotic component in your bottle.
\r\n 
\r\nWhich is that?
\r\n 
\r\nGet a cup of water from pond, stream or puddle. Measure just 50 ml using syringes and pour it into your bottle.
\r\n 
\r\nWatch the video given below to learn to measure water using syringe(we have already prepared the video of measuring water using syringe, avoiding air bubble etc. we could give it here)
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\u200b
\r\nWhy have we got this water?

\r\n\r\n

 
\r\nWater from the natural water bodies such as pond, stream or puddle will contain many biotic components such as different kinds of micro organism and help in setting up of our system.
\r\n 
\r\nOnce you have done that please mark your bottle with your group number on it.
\r\n 
\r\nTeam A: This team will use paper (you can also use any waster thick newspaper, ` black chart paper etc) to cover their bottle from outside so that no sunlight reaches the water.
\r\n 
\r\nTeam B: The second team will add a pinch of artificial manure or urea solution to the water.
\r\n 
\r\nTeam C: The third team will not add any manure to the water or cover the bottle with paper. They will just keep it like that.
\r\n 
\r\nPlease keep your bottle near a window where there is enough sunlight. Now you need to go for long-term observation.
\r\n 

\r\n\r\n

What to observe

\r\n\r\n

As you know in order to call your bottle an ecosystem it needs to have both abiotic and biotic factors. You already have abiotic factors - Water, Sunlight, Air, Urea or Manure. You need to wait till biotic factors appear in it.
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Watch out for the following changes in your system and record it in your notebook

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\r\nDay on which the water of your ecosystem started becoming pale green in color  - due to the growth of algae
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\r\nWhen did you notice the zooplankton - they may be visible as tiny white or brown dots moving in the water of your ecosystem
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\r\nDate on which insect larvae such as mosquito larva seen in your ecosystem
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\r\nTime is taken for water becoming more greenish - meaning that the number of algae has increased.
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\r\nAny other changes or organisms you noticed in your ecosystem
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\r\nMake a table (given below) in your notebook and record your observations daily
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Days

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Day 1

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Water is clear, no organism found\u2026.

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Day 2

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\u2026.

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\u2026.

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Day 15

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\r\nEvery second and third day you should compare your observations with other groups.
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\r\nDo all the teams get the same observation?
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Discussion point

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\r\nCould you call this an ecosystem? Why?
\r\nWill you call it a man made ecosystem or a natural ecosystem?

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