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KS3 plants

QuestionAnswer
State the limiting factors which affects the rates of photosynthesis temperature, light and carbon dioxide
Name the organ through which plants absorb water roots
Name the tissue through which water can flow through plants xylem
Name the tissue through which sugar solution can flow through plants phloem
Name the reactants needed for respiration oxygen and sugar
State where photosynthesis takes place in plants leaves
Name chemicals containing minerals to enhance plant growth fertilisers
Name specialized cells with containing lots of chloroplasts palissade cells
Write the word equation for photosynthesis carbon dioxide + water –-(sunlight)--> sugar + oxygen
State the function of chlorophyll absorbs sunlight
Name the type of plant which converts the suns energy into food green plant
Name the cells through which water is absorbed root hair cells
Name the store of energy/food found in cells starch
Explain why palisade cells are found at top of leaves Because this is where there is most sunlight, so by having it at the top of leaves, it maximises the amount of sunlight absorbed
Name the process by which plants turn the Sun’s energy into food photosynthesis
Name the products of respiration Carbon Dioxide and Water
Describe the chemical used to test for starch Iodine; if there is starch, the food will go blue-black; if there is no starch it will stay brown
Name cells through which gases can diffuse in an out of leaves spongy cells
Give two adaptations of root hair cells Thin cell wall and a long extension of the cell
Explain why root hair cells have a long extension Provides a large surface area (1); to collect more water(1)
Explain why root hair cells have a thin cell wall So that it is easier for water to go through
Would you expect the stomata to be close or open on a hot sunny day? Explain your answer Close to prevent too much water vapour from escaping
Why is the cuticle make of a waxy layer? What is the job of the wax? To prevent water from escaping
State what organelle (part of the cell) would you expect to find in great numbers in the palisade cells? Chloroplasts
Explain why would you expect the spongy cells to contain only a few chloroplast? There is little direct sunlight that reaches the bottom of leaves where chloroplasts are found; so less need to absorb sunlight
Explain why are the palisade cells so tightly packed together? To maximise the amount of sunlight that can be absorbed
Explain why are the spongy cells so loose? To allow air flow more easily
State the mechanism/process by which the gases move from the air space into the spongy cells Diffusion
Explain how diffusion works The gases go from an area of low concentration to an area of high concentration
What is the function of the waxy cuticle? to prevent water loss
What is the function of the palisade cells? they are the cells responsible for photosynthesis. There are lots of chloroplast in a palisade cell.
What is the function of the stomata? It is the hole through which the gas enter
What is the function of the guard cells? they are the cell around the stomata. They will close up or open the stomata to let gases in and out.
How are spongy cells adapted for gas exchange? They are loosely-packed with unusually large intercellular air spaces where gases can collect and mix.
What is the function of the Cell wall? support the plant
What is the function of the Cell membrane? controls what goes in and out of a cell
What is the function of the Nucleus? controls cell’s activities
What is the function of the Chloroplast? absorbs sunlight; where photosynthesis takes place
What is the function of the Cytoplasm? where chemical reactions take place
What is the function of the Vacuole? Store water and waste
What is the function of the Starch grain how food is stored in a plant cell
What is the function of the Mitochondrion Produces the energy a cell needs to carry out its functions
Do you expect leaves with a larger surface area (broad leaves) to lose more or less water? They will lose more water as there are probably more stomata
In a hot climate, would you expect to find more or fewer stomata on large leaves? There are probably less stomata PER CM2, so that there is LESS water loss
What other advantages are there for a leaf to have a large surface area? Can capture MORE light to produce MORE sugar
Explain why houseplants have more shiny leaves than outdoor plants? In a house, it is hot, so to minimise water loss, the plant will have a thicker cuticle
What is the name of the green pigment found in chloroplast; this pigments absorbs light Chlorophyll
Give two uses of sugar by a plant? For respiration; to store as starch
Compare the amount of photosynthesis and respiration during the night At night, the plant respires but does not photosynthesise (no light)
Compare the amount of photosynthesis and respiration during the day During the day, the plant does more photosynthesis than respiration; but respiration still takes place
What is the relationship between starch and sugar? Starch is a polymer of sugar (many sugar molecules stringed up together make a starch molecule)
Explain the advantage for plants in the shade to have leaves with a large surface area? to absorb more light
State which organelles are found ONLY in plant cells? Chloroplast, vacuole and cell wall
State which organelles are found BOTH in plants and in animal cells? Cell membrane, cytoplasm and nucleus
Explain how a palisade cell is adapted to do its job by comparing to a normal cell A palisade cell has MORE chloroplast than a normal plant cell (1) so it can collect MORE ligh (1)
State 3 things that the plants needs to do photosynthesis carbon dioxide, water and light
Describe how lots of sugar molecules are transformed into a molecule of starch the molecules of sugar join together
Why does the plant need starch? starch is a store of energy so that the plant can use it later
Why is there no starch in a plant that was left for 2 days in the dark? During those 2 days, the plant did not do photosynthesis, so did not make "food". The plant had to use up its store of energy= the plant had to use up the starch
Pourquoi les plantes ont besoin de lumière ? - Pour grandir une plante a besoin de lumière. - La plante a besoin d'eau et de soleil pour pousser. - Les plantes se penchent vers la lumière lorsqu'elles poussent. - Il n'est pas possible de faire pousser une plante dans l'obscurité.
Quel est le rôle de la lumière dans la photosynthèse ? La photosynthèse nécessite de la lumière, de l'eau et du gaz carbonique. Une partie du spectre de la lumière est absorbée par les feuilles des plantes.
Quel est le rôle de la feuille ? alimentation et respiration. Grace à la chlorophylle contenue dans les cellules de son limbe, elle transforme, sous l'action solaire, le gaz carbonique de l'air et hydrogène de l'eau en glucides, avec dégagement d'oxygène, c'est la photosynthèse.
pourquoi une plante jaunit ? Substrat trop humide. Un excès d'arrosage est une cause fréquente de jaunissement, notamment pour les plantes en pot. cela induit le pourrissement des racines, ce qui est irrémédiable : la plante ne peut plus se nourrir correctement.
Peut-on dire que les plantes respirent la nuit et Font de la photosynthese le jour? Non, La nuit, la plante ne realise plus de photosynthese et n'absorbe donc pluse de CO2. Mais elles une production de CO2 et une absorption d'O2 (respiration); mais le jour les cellules ont besoin de respire aussi
Sans lumiere, que devient une plante Une plante privee de lumiere va s'allonger et devenir tres pale, mais faute de pouvoir faire la photosynthese et donc d’avoir de l'energie, elle finira par morir.
Dans quelle organelle se trouve la chlorophylle? Ca se situe dans les chloroplastes des cellules vegetales
Est-ce qu’une plante a besoin de la terre? non, une plante n'a pas besoin de terre pour vivre.
Est-ce qu’un cactus a des feuilles? oui, un cactus a des feuilles mais les feuilles se sont refermées pour qu’ils ne perdent pas beaucoup d’eau.
Par où le dioxyde de carbone entre-t-il dans une plante? les dioxyde de carbone entre en dessous de la feuille par les stomates.
Est-ce que les feuilles à plusieurs couleurs on du chlorophylle? ou, les feuilles à plusieurs couleur on du chlorophylle
A quoi sert la chlorophylle dans une plante? dans une plante, la chlorophylle sert à donner la couleur verte pour qu elle puisse capturer la lumière, et utilisé pour la photosynthèse.
Est-ce que les plantes peuvent vivre dans l'eau? oui, il y a plusieurs plantes vivant dans l'eau.
Created by: ursulinebio