Revision notes for Biology

I wrote these notes for my Biology common test revision, but it doesn't cover everything. Hope you'll find them useful.

*there may be typos coz I didn't proofread. sorry. And some pages are incomplete, especially the ones on respiration coz I didn't bother to draw arrows using the computer to show substances involved.

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  • Created by: saraht
  • Created on: 25-09-11 15:07
PDF Document 1.46 Mb

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Mineral requirement of plants
Element Form in soil Main function Deficiency symptom Nitrogen (N) NO
3

- and NH
4
+

· Synthesis of protein and chlorophyll
· Poor growth
· Yellow leaves (appear in older leaves first) Phosphorus (P)
PO
4
3-

· Synthesis of nucleic acids
· Poor…

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Cylindrical cells forming long tubes
Narrow cells
Functions Transport water & dissolved minerals
Transport organic solutes
Support activities of sieve tubes Direction of transport
Upwards (root leaves)
Upwards/downwards (site of production storage/need; site of storage need)
--------
Living/dead cells Dead Living Living Cytoplasm Absent Present (in strands) Present Nucleus
Absent…

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· Eventually, water is drawn from the xylem vessels by osmosis, which creates a force, the
transpiration pull, which draws water up the xylem vessel from the roots.
*Xylem has the lowest water potential, followed by cortex. *Water lost through cuticle, stomata
and lenticels *Aids in absorption of water and…

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Bubble potometer = measure the rate of WATER UPTAKE by leafy shoot.
· Assumption: the rate of water uptake = rate of transpiration (i.e. most water absorbed is used
to compensate for water loss. However, some water is actually retained in plant for support and
some are used as reagents…

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onion, daffodil, garlic)
· Corm: short, swollen underground stem w/o fleshy scale leaves (e.g. water chestnut,
Gladiolus) *adventitious roots and aerial buds

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Structures and functions of various parts of a flower
Flower Part Structure Function Calyx Consists of sepals · Protects flower bud Corolla Consists
of petals · Protects inner parts of flower
· Maybe brightly coloured to attract insects
· May have nectaries that secrete nectar for insects to feed on…

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Revision notes for Biology

I wrote these notes for my Biology common test revision, but it doesn't cover everything. Hope you'll find them useful.

*there may be typos coz I didn't proofread. sorry. And some pages are incomplete, especially the ones on respiration coz I didn't bother to draw arrows using the computer to show substances involved.

  • Created by: saraht
  • Created on: 25-09-11 15:07
PDF Document 1.46 Mb

Pages in this set

Page 1

Preview of page 1

Page 2

Preview of page 2
Mineral requirement of plants
Element Form in soil Main function Deficiency symptom Nitrogen (N) NO
3

- and NH
4
+

· Synthesis of protein and chlorophyll
· Poor growth
· Yellow leaves (appear in older leaves first) Phosphorus (P)
PO
4
3-

· Synthesis of nucleic acids
· Poor…

Page 3

Preview of page 3
Cylindrical cells forming long tubes
Narrow cells
Functions Transport water & dissolved minerals
Transport organic solutes
Support activities of sieve tubes Direction of transport
Upwards (root leaves)
Upwards/downwards (site of production storage/need; site of storage need)
--------
Living/dead cells Dead Living Living Cytoplasm Absent Present (in strands) Present Nucleus
Absent…

Page 4

Preview of page 4

Page 5

Preview of page 5
· Eventually, water is drawn from the xylem vessels by osmosis, which creates a force, the
transpiration pull, which draws water up the xylem vessel from the roots.
*Xylem has the lowest water potential, followed by cortex. *Water lost through cuticle, stomata
and lenticels *Aids in absorption of water and…

Page 6

Preview of page 6

Page 7

Preview of page 7
Bubble potometer = measure the rate of WATER UPTAKE by leafy shoot.
· Assumption: the rate of water uptake = rate of transpiration (i.e. most water absorbed is used
to compensate for water loss. However, some water is actually retained in plant for support and
some are used as reagents…

Page 8

Preview of page 8
onion, daffodil, garlic)
· Corm: short, swollen underground stem w/o fleshy scale leaves (e.g. water chestnut,
Gladiolus) *adventitious roots and aerial buds

Page 9

Preview of page 9

Page 10

Preview of page 10
Structures and functions of various parts of a flower
Flower Part Structure Function Calyx Consists of sepals · Protects flower bud Corolla Consists
of petals · Protects inner parts of flower
· Maybe brightly coloured to attract insects
· May have nectaries that secrete nectar for insects to feed on…

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