Growing Plants

Growing Plants - StandardGrade Biology Topic2...

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Topic 2 The World of Plants Standard Grade  Biology
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World of Plants  is divided into: A- Introducing plants B-  Growing plants  (Pollination, Fertilisation,  Asexual reproduction) C- Making food
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The life cycle of a plant There are 7 stages in the life cycle of a  plant. seed / fruit  Formation seed  dispersal germination flower  formation pollination fertilisation development
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Seed Structure Parts are: Seed coat Forms a tough  protective layer Food store Provides the  embryo plant  with food. Embryo  shoot Embryo  root Embryo  – grows  into  plant
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Seed Dissection Using a scalpel, carefully dissect your  seed in half lengthways. Draw a diagram of what you can see. Identify the parts, and label your drawing (workbook p13).
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Seeds
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Investigation: Germination This is an Exam Board Investigation that  makes up part of your Practical Abilities  grade (20% of finals) Planning may be done in small groups but  after this you  must work on your own Write in your Investigation booklet.
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What affects germination? 3Bio2 Brainstorm 16/03/07 Spacing / number of seeds Humidity / water volume Type of seeds Size of seeds Type of soil / mass Temperature Depth of planting Gases / oxygen levels Measure by % germination after set time
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Germination and Temperature Example of results table. Also draw a graph. What conclusions can you draw from your experiment?   How could you have improved it? Temperature o C No. of  seeds No. of seeds  germinated Percentage  germination 4 25 20 25 50 25
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Germination conditions Seeds need certain conditions to  germinate: Water   to activate enzymes which digest stored food Oxygen Needed for the production of energy for  germination Warmth Needed for the enzymes to work effectively.  Germination is the development of a new plant  from the embryo in a seed.
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Germination and Temperature The best temperature for germination of a  species of plant is known as the  optimum  temperature . The optimum temperature is normally  between 15 o C and 30 o C.
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Structure of a Flower
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Petal Stigma Anther
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Petals Stigma Anther Filament Ovary Sepals Ovules Nectaries Style Collect a cut-out flower, colour it in and put it together.  Carpel fe male  parts Stamen   male parts
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What do the parts do? Sepals-  protect  the flower when  it is a bud Petals-   colourful to  attract the insects Nectaries-   give out sugary  liquid to attract  insects  Stamen - anther   produces male sex cells  (pollen) Carpel- stigma  traps  pollen Style  is where pollen tube  grows down to female sex  cells.
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