GCSE Edexcel Biology Paper 2 Section 1 0.0 / 5 ? BiologyPhotosynthesis and transpirationGCSEEdexcel Created by: Alfie GardCreated on: 29-02-20 17:51 What is Photosynthesis? Photosynthesis is the process that plants and algae use to make their own food. 1 of 33 Plants use light for their source of energy. The reaction that plants use to trap the light energy is called... Photosynthesis 2 of 33 As photosynthesis takes in energy, what type of reaction occurs? An Endothermic Reaction 3 of 33 Where does photosynthesis take place? Photosynthesis takes place in the leaves of a plant. 4 of 33 What chemical do leaves contain? Leaves contain the green chemical called Chlorophyll. 5 of 33 What is the role of the Chlorophyll? The chlorophyll absorbs the light energy. 6 of 33 What do the limiting factors mean in photosynthesis? The limting factors limits the rate of Photosynthesis when it is at a low level. 7 of 33 What are the 3 Limiting factors of Photosyntheis? Low temperature, Low light and Low carbon dioxide. 8 of 33 Why are plant cells specialised? Plant cells are specialised as they develop adaptations which help them to carry out particular functions. 9 of 33 What is Transpiration? Transpiration is the movement of water through a plant from the roots to the leaves. 10 of 33 What is the definition of Osmosis? Osmosis is the diffusion of water from a dilute solution to a concentrated solution through a partially permeable membrane. 11 of 33 Whereabouts in the leaf does photosynthesis take place? Photosynthesis takes place in the Palisade Mesophyll. 12 of 33 What is the role of the Xylem tissue? The Xylem transports water and dissolved minerals from the roots to the leaves. 13 of 33 What is translocation? Translocation is the transport of Sucrose around a plant. 14 of 33 What is Sucrose used for? Sucrose is needed for growth in plants. 15 of 33 What are the three factors that affect the rate of transpiration? Light intensity, Air movement and temperature. 16 of 33 How does light intensity affect the rate of transpiration? High light intensity causes the stomata to open. This increases the rate of evaporation from the leaf so more water is taken up to replace this. 17 of 33 How does Air movement affect the rate of transpiration? Wind blows moist air away from the stomata, keeping the diffusion gradient high. So the more air there is, the greater the transpiration rate. 18 of 33 How does Temperature affect the rate of transpiration? The higher the temperature, the more energy water molecules have, so they move faster which means a faster rate of transpiration. 19 of 33 What can you use to measure the rate of transpiration? You can use a Potometer. 20 of 33 Rate of transpiration can be measured as... Distance moved / Time taken. 21 of 33 Why do plants have adaptations? Plants have adaptations that allow them to survive in extreme conditions. 22 of 33 What is tropism? Plant tropism is a plants response to a stimulus by growing. 23 of 33 What is postive tropism? Positive tropism is when the plant grows towards the stimulus. 24 of 33 Plant shoots show positive phototropism because... They grow towards the light. 25 of 33 Plant roots show positive gravitropism because... They grow downwards towards the pull of gravity. 26 of 33 What are plant hormones? Plant hormones are chemicals that cause changes in plants. 27 of 33 What are Auxins? Auxins are plant hormones that make cells grow longer. 28 of 33 What are auxins affected by? Auxins are affected by light and they cause phototropism in shoots. 29 of 33 Whereabouts on the plant is auxin produced? Auxin is produced at the very tip of the shoot. 30 of 33 What does the light cause auxins to do? Light causes auxins to concentrate on the darker side of the shoot tips. 31 of 33 What is the use of Giberellins? Giberellins are important in starting the germination of seeds. 32 of 33 What does ethene control in plant hromones? The chemical ethene controls cell division and the ripening of fruits. 33 of 33
GCSE EDEXCEL BIOLOGY HUMAN INFLUENCES ON THE ENVIRONMENT (DEFORESTATION) 5.0 / 5 based on 1 rating Teacher recommended
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