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A.Biology > PLANTS > Flashcards

PLANTS Flashcards

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1
Q

WHAT IS PHOTOSYNTHESIS

A

when plants (single-cell organisms) CONVERT light ENERGY into chemical energy

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2
Q

PHOTOSYNTHESIS WORD EQUATION

A

carbon dioxide + water —> glucose + oxygen

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3
Q

PHOTOSYNTHESIS SYMBOL EQUATION

A

6CO₂ + 6H₂O —> C₆H₁₂O₆ + 6O₂

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4
Q

3 FACTORS THAT AFFECT THE RATE OF PHOTOSYNTHESIS

A

-tempature
-light
-CO2 concentration
= TLC

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5
Q

HOW ARE MINERALS IONS ABSORBED FROM SOIL

A

by active transport

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6
Q

HOW ARE ROOT HAIRS ADAPTED

A

they have a large surface area

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7
Q

WHY DO ROOT HAIRS CELLS NEED ENERGY TO TAKE UP MINERAL IONS

A

because they take up the ions and have to travel against the concentration gradient by active transport.

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8
Q

STARCH TEST

A
  1. place leaf in beaker of boiling water-opens cells(iodine)
  2. leaf into ethanol and heat- removes cholophyll
  3. flatten leaf and add iodine 3-4 drops- blue black
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9
Q

PHLOEM

A

transports sucrose and amino acids from leaves to other parts of the plant. Made of living cells, containing cytoplasm but no nucleus. draw it

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10
Q

XYLEM

A

transports water and mineral ions (e.g nitrate and magnesium) from the roots to all parts of the plant. draw it

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11
Q

AUXIN

A
  • this is a plant hormone
  • it makes cells that make the stem grow longer
  • it moves awas from the light
  • made in the tips and shoots
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12
Q

AUXIN DIFFUSSES…

A

downwards

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13
Q

AUXIN MOVES TO THE…

A

shady side

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14
Q

THE SHOOT MOVES

A

towards the sun

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15
Q

HOW DO YOU OBTAIN NITRATES/AMINO ACIDS

A

through the soil- root hairs -used for making proteins

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16
Q

HOW DO YOU OBTAIN WATER

A

through the soil- root hairs- used for photosynthesis

17
Q

HOW DO YOU OBTAIN MAGNESIUM

A

through the soil- root hairs- making chlorophyll

18
Q

HOW DO YOU OBTAIN CARBON DIOXIDE

A

from the air- used for photosynthesis

19
Q

WHAT INVESTIGATION CAN YOU USE TO SEE IF CARBON DIOXIDE IS NESSARY FOR PHOTOSYTHESIS

A
  1. use a destarched plant (has been put in a dark place)
  2. put it in a glass container with a small petri dish of potassium hydroxide to remove the carbon dioxide
  3. leave for a few hours e.g 4 hours in a light place
  4. test leaves for strarch with iodine
  5. it won’t go blue and black because it is needed for photosynthesis
20
Q

WHAT INVESTIGATION CAN YOU USE TO SEE IF LIGHT IS NEEDED FOR PHOTOSYNTHESIS

A
  1. put pond weed + water in a test tube and O² bubbles should come off
  2. move the lamp away from the plant- at 10cm intervals
  3. count the number of bubbles per minute 3 times at each distance
21
Q

WHAT IS THE INDEPENDANT VARIBLE

A

the factor being changed by the person doing the experiment

22
Q

WHAT IS THE DEPENDANTENT VARIBLE

A

what is being measured by the person doing the experiment

23
Q

WHAT IS THE CONTROLLED VARIBLE

A

the thing that must be kept the same

24
Q

PLANT RESPONSES -SHOOT- why is important

A 
grows towards the light and away from the force of gravity
$IMPORTANT CUZ$
-get light for photosynthesis
-grow higher than other plants
-grow above grazing animals
25
Q

WHY DO ROOTS GROW AWAY FROM LIGHT AND TOWARDS GRAVITY

A

to get water from the soil, to support the plant- give stability

26
Q

GROWTH RESPONSES (2 of them)

A

PHOTOTROPISM- responds to light

GEOTROPISM- responds to gravity

27
Q

POSITIVELY PHOTOTROPIC

NEGATIVELY PHOTOTROPIC

A

positively- shoots

negatively- roots

28
Q

POSITIVELY GEOTROPISM

NEGATIVELY GEOTROPISM

A

positively- roots

negatively- shoots

29
Q

LABEL A PLANT CELL

A

LABEL A PLANT CELL

30
Q

HOW ARE LEAVES ADAPTED FOR THEIR FUNCTION

A
  • large surface area to absorb light
  • thin- short diffusion distance for CO²
  • veins- transport water into the leaf (also support)
  • waxy surface- stops leaves losing water
  • flat surface towards the sun
  • green contains chlorophyll
31
Q

DRAW AND LABEL THE CROSS SECTION OF A LEAF

A

DRAW AND LABEL THE CROSS SECTION OF A LEAF

A.Biology (11 decks)

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