Gases like carbon dioxide move by a process called diffusion and diffusion is affected by distance – the greater the distance, the slower the diffusion. I will be appearing foe my biology paper in this may/june so probably i will need more help…THANKS. Thank you – I’m pleased you find my site useful! The shape of the leaves enable to absorb maximum sunlight for photosynthesis. Could you explain this in simpler words? which vascular tissues ( parenchyma, fiber, sclerenchyma, collenchyma ) contain greatest number of chloroplast ? Spongy Mesophyll: this tissue contains large air spaces which are linked to the atmosphere outside the leaf through microscopic pores called stomata on the lower surface. So air spaces in the leaf mean that carbon dioxide moves into leaf cells (mesophyll cells) faster than if there were no air spaces. It produces glucose, and oxygen as a by-product. Sorry for intruding I am a year 9 pupil and was wondering that you indirectly praised DORIC, is that a general technique used in the Biology Curriculum for a) GCSE b) IGCSE. The leaf is the organ in a plant specially adapted for photosynthesis. The presence of numerous stomata on the surface for gaseous exchange. The palisade cells contain many chloroplasts which allow light to be converted into energy by the leaf. Carbon dioxide can diffuse into the leaf through the stomata when they are open (usually at day time) and water evaporates out of the stomata in a process called transpiration. Sorry, your blog cannot share posts by email. I want to keep this material to IGCSE Biology content and light independent stages of photosynthesis are only needed at A level and beyond…. The air spaces reduce the distance carbon dioxide has to diffuse to get into the mesophyll cells and the fact that these cells have fairly thin cell walls which are coated with a film of water together means that gas exchange between air space and mesophyll is speeded up. The adaptations of leaf for photosynthesis are as follows: What are the adaptations of leaf for photosynthesis - Science - Lif⦠Leaves have chlorophyll i.e. Leaves are broad and flat to provide a large surface area and to provide a ⦠Thanks. That is outside the scope of this blog I’m afraid. Plant leaves are adapted for photosynthesis and gas exchange. The air spaces reduce the distance carbon dioxide has to diffuse to get into the mesophyll cells and the fact that these cells have fairly thin cell walls which are coated with a film of water together means that gas exchange between air space and mesophyll is speeded up. Biology posts related to EdExcel IGCSE specifications. Size and Number of Leaves 2. The site has been useful,i’d like to ask about the carbon (iv) oxide theory of photosynthesis. Sample exam questions - plant structures and their functions - Edexcel, Home Economics: Food and Nutrition (CCEA). Change ). I am currently working as the Head of Biology at a wonderful co-ed secondary school in Cambridgeshire. This is because if the xerophyte has adapted to carry out photosynthesis in its stem, and in photosynthesis the gas exchange of carbon dioxide in and oxygen out is necessary. Adaptations of a leaf for photosynthesis Transverse section of a leaf showing some of the adaptations ⢠Cuticle: - Is non-cellular, water proof and transparent. To allow more light to reach the palisade cells, To protect the leaf from infection and prevent water loss without blocking out light, To absorb more light and increase the rate of photosynthesis, Air spaces allow gases to diffuse through the leaf, When a plant is carrying out photosynthesis carbon dioxide needs to move from the air into the leaf. Click to share on Pinterest (Opens in new window), Click to email this to a friend (Opens in new window), Click to share on Tumblr (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Section 2: Structures and Functions in Living Organisms, Start of 2015-16 school year – welcome back! Photosynthesis is the process by which leaves absorb light and carbon dioxide to produce glucose (food) for plants to grow. Small leaves mean less evaporative surface per leaf. Yes you are right but that is also what I said in the answer to the question. 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