rhymes and reasons
. 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. | PMG Biology, Controlled experiments: what do examiners mean? The presence of numerous stomata on the surface for gaseous exchange. Biology posts related to EdExcel IGCSE specifications. Change ), You are commenting using your Google account. I agree with this. whats wrong if you say light is —transported— through the upper epidermis. Although these design features are good for photosynthesis, they can result in the leaf losing a lot of water. This means there is as little overlap between leaves as possible so that as many photons of light as possible hit a leaf. Any anabolic reaction (synthetic) requires energy. The adaptations of leaf for photosynthesis are as follows: Leaves have chlorophyll i.e. But otherwise I think you are correct. the main site for photosynthesis. I’m pleased you find the website useful. This process is called photosynthesis. This site is really helpful, It has helped me answer my assignment without difficulties. They also show “cytoplasmic streaming” which is a process in which the cytoplasm rotates around the cell so every chloroplast is exposed to the same high light intensity at the top of the cell. My main interests away from education are racing, rackets, real tennis and supporting the mighty Cobblers. Haha you can’t rush me as I am on my summer holidays and rushing is not possible at the moment! And as light energy increases, so does photosynthesis. Which help them to absorb more photons. Spongy mesophyll cells also contain chloroplasts and photosynthesis occurs here too. (b) Leaves are arranged at right angles to the light source in a way that causes overlapping for absorption of more light. I don’t know much about other exam boards other than IGCSE so I think that the DORIC shortcut for answering “design an experiment” questions only really applies to this one exam board. In the light dependent phase of photosynthesis, energy from the sunlight is converted into energy currency , ATP and stored. The nucleus controls all the chemical activities inside every eukaryotic cell. Some plants, such as Mormon tea and cacti, carry out most or all of their photosynthesis in their green stems. Thanks for your comment. Thanks Paul. A plant cell becomes turgid when it takes in water by osmosis and the way cellulose fibres are laid down in the cell wall of these sausage-shaped cells causes the stoma to open up when a guard cells takes in water. The leaf has evolved, special parts to conduct photosynthesis, a process that uses energy from the sun to turn carbon dioxide and water into sugars needed for plant growth. 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. 830 views View 1 Upvoter Carbon dioxide is a gas found in air. Leaves shows following adaptations for photosynthesis
(a) Leaves provide large surface area for maximum light absorption. Thank you. . fantastic explanation! Leaves are adapted for carrying out photosynthesis by virtue of their flat shape and periodic replacement, and because they contain most of the plant’s chlorophyll. Small leaves mean less evaporative surface per leaf. The shape of the leaves enable to absorb maximum sunlight for photosynthesis. Grade 9 Understanding for IGCSE Biology, Diffusion, Active Transport and Osmosis: Grade 9 Understanding for IGCSE Biology 2.15 2.16, Air Pollution part 1: Grade 9 understanding for IGCSE Biology 4.12, Starch Digestion: Grade 9 Understanding for IGCSE Biology 2.29, Cell Structure: Grade 9 Understanding for IGCSE Biology 2.2 2.3 2.4, The Human Alimentary canal: Grade 9 Understanding for IGCSE Biology 2.27, Hormones: Grade 9 Understanding for IGCSE Biology 2.94 2.95B, Comparing Nervous and Hormonal Coordination: Grade 9 Understanding for IGCSE Biology 2.86, Chromosomes and Sex: Grade 9 Understanding for IGCSE Biology3.26 3.27, Protein Synthesis (part 3): Grade 9 Understanding for IGCSE Biology 3.18B. I thought it had to do with absorption of water by the guard cell and the elasticity difference of the walls of the guard cell. Adaptations of a leaf for photosynthesis Transverse section of a leaf showing some of the adaptations • Cuticle: - Is non-cellular, water proof and transparent. Resources: Structure of the leaf and stomata Ttructure and function of stomate 2 The leaf is the organ in a plant specially adapted for photosynthesis. Yuccas, xerophytic bromeliads, and epiphytic orchids are examples of plant species that perform CAM photosynthesis. Hope this short answer helps!! ( Log Out /  This is SUPER HELPFUL! This site is very useful and very helpful to me and i would recommend to anyone who finds biology hard. Umm I dont want to rush you but can u reply asap? Plants have two different types of 'transport' tissue. adaptations of a leaf for photosynthesis: structural features - Large SA: to capture more light - Thin: short distance for light to penetrate to reach chloroplasts Leaf cells need carbon dioxide for the process of photosynthesis. You are welcome. Leaves are adapted to perform their function, eg they have a large surface area to absorb sunlight. Leaves enable photosynthesis to occur. The only interesting thing about it is that it contains specialised cells called guard cells which enclose a pore called a stoma. Some of this water evaporates, and the water vapour can then escape from inside the leaf. Includes literacy task Marketplace True/False Exam Question Plants have two different types of 'transport' tissue, xylem and phloem. The only thing that’s wrong is that “transported” makes it sound like the plant is actively transporting the light through the epidermis. Lesson 2: Adaptation of the leaf Objectives: • Describe leaf adaptations for photosynthesis • Outline how raw materials needed for photosynthesis enter the plant. 1. I’m pleased you find the site useful – keep working hard! The upper epidermis cells have no chloroplasts so light passes through them easily. That is outside the scope of this blog I’m afraid. absorbed. Pretty sure it is parenchyma… Sclerenchyma are almost always dead and collechyma have a structural function for the most part…, HOW IS THE ARRANGEMENT OF THE LEAVES IN THE STEM RELATED TO ITS EFFICIENCY IN ABSORBING FOR PHOTOSYNTHESIS, Leaves are arranged in a position to maximise absorption of sunlight. Thank you for your positive feedback – much appreciated! Thank you. The function of a leaf is photosynthesis - to absorb light and carbon dioxide to produce glucose (food). The leaf grows at right angles to ensure the largest surface area is exposed to the sunlight. The presence of chlorophyll containing chloroplast. They are adapted for photosynthesis by having a large surface area, and contain openings, called stomata to allow carbon dioxide into the leaf and oxygen out. Guard cells’ role in photosynthesis is an indirect one – photosynthesis does not happen to a significant extent in a guard cell. Its surface is large,broad,wide to provide even larger surface area for trapping light energy. Thanks for the feedback – glad you find the site useful…. You might be asked what the function is for any of the important parts. Leaf adaptations vary for different hydrophytes, due to the differences in their ecological niches. Leaf Adaptations in Desert Plants Desert plants usually have leaves that are adapted to hot and arid conditions. Although these design features are good for photosynthesis, they can result in the leaf losing a lot of water. I mean I dont want to rush you or offend u in anyway. Firstly most contain chlorophyll (some other plants e.g. Roots absorb water and mineral ions through root hair cells and are transported up the plant by the xylem. When a plant is carrying out photosynthesis carbon dioxide needs to move from the air into the leaf. You have really helped me.I thought it would be hard to understand coz am 13 and my vocabulary aint that good. 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