Flashcards in Topic 6- Plant Structures and their Functions Deck (69):
In a food chain, consumers eat other organisms. What word is used to describe organisms that make their own food?
What process do plants and algae use to make their own food?
In what sub-cellular part of a plant cell does photosynthesis occur?
What substance from the air do plants need for photosynthesis?
What substance from the ground do plants need for photosynthesis?
What organs do plants use to get water from the ground?
How are roots adapted to getting water from the ground quickly?
large surface area, root hair cells
What energy-storing compound is made in photosynthesis?
Suggest one use for glucose in a plant.
respiration, making other substances
In what sub-cellular part of a plant cell does respiration occur?
What product of photosynthesis is a gas at room temperature?
Plants photosynthesise. Name one other group of organisms that photosynthesise.
algae or cyanobacteria
What reactant in photosynthesis is a gas at room temperature?
What are all the materials that make up an organism known as?
In what subcellular parts of plants does photosynthesis occur?
Where does all the energy originally come from in most food chains?
What polymer inside chloroplasts is made from glucose?
Name the main sugar that is transported around most plants.
How are most leaves adapted to only allow gas exchange during the day?
What do we mean by the ‘rate’ of photosynthesis?
the speed of the reactions
What is a rate of reaction?
how fast a reaction happens
What do we call something that prevents a rate of reaction increasing?
If light intensity is a limiting factor, what happens to the rate of photosynthesis when it is increased?
The rate increases.
When there is plenty of light and plenty of carbon dioxide, suggest one factor that could be limiting.
temperature or water
What happens to the rate of photosynthesis as a plant is moved further away from a light source?
What relationship is shown by a straight line through the points on a scatter graph?
What sort of linear relationship is shown by a straight line through the origin?
Higher and Triple only- By what law does light intensity vary with distance?
inverse square law
Higher and Triple only- What is light intensity inversely proportional to?
What happens to plants if they do not get enough water to fill their cells?
What term is used to describe the amount of a substance in a certain unit volume?
What term is used to describe the overall movement of particles from higher concentration to lower concentration?
What term is used to describe the overall movement of solvent particles from higher concentration to lower concentration through a partially permeable membrane?
What is the gradual change in concentration from one place to another called?
What process do cells use to transport substances against their concentration gradient?
What adaptation do some root cells have in order to increase the amount of water they can absorb?
Why do cells that use active transport often have a lot of mitochondria?
Active transport needs a lot of energy.
What do plants need nitrate ions for?
Through what vessels is water moved up a plant?
Through what tissue are sugars transported around a plant?
What is the flow of water through a plant called?
In what vessels does water flow?
In what vessels are dissolved mineral ions carried?
Give one other function of xylem vessels.
supporting the plant
What tissue is used for translocation?
Give the names of the two most common cells in phloem tissue.
sieve tubes and companion cells
Why do companion cells contain many mitochondria?
because they actively pump sucrose in and out of sieve tubes
If the humidity of the air around a plant is reduced, what happens to the rate of transpiration?
Which cells create the air spaces inside a leaf?
What term describes trees that lose their leaves in winter?
In which tissue of a plant leaf does most photosynthesis occur?
Which tissue in a plant leaf consists of irregularly shaped cells that create air spaces?
Give one function of cuticle.
to prevent microorganisms entering/to prevent water entering/to reduce evaporation of water
What cells control the opening and closing of stomata?
Explain why conifer trees have their stomata in pits.
to trap water vapour and reduce water loss
What word describes trees that lose their leaves in winter?
Why do deciduous trees lose their leaves in winter?
to prevent water loss when water in the ground may not be available because it is frozen
Why is it an advantage for a plant root to grow downwards?
to anchor the plant/to reach water
Why is it an advantage for a plant shoot to grow towards the light?
to get energy for photosynthesis
What is a growth in response to a stimulus called?
What is a growth in response to the stimulus of light called?
What is a growth away from light called?
Name a part of a plant that shows negative phototropism.
What plant hormones cause phototropism?
What effect do auxins have on cells in a plant shoot?
cause them to elongate
What effect do auxins have on cells in a plant root?
stop them elongating
Name the growth response of a root in the direction of gravity.
Name the group of plant hormones that are used to help seeds germinate.