need for it to be retained in the plant. This means that guard cells on the stomata are generally inactive. 3. An increased number of stomata‚ that can be on either side of leaves. 4. A less rigid structure: water pressure supports them. 5. Flat leaves on surface plants for floatation. 6. Air sacs for floatation. 7. Smaller roots: water can diffuse directly into leaves. 8. Feathery roots: no need to support
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PAPER 3 Answer all question. Question 1 Transpiration is the evaporation of water vapour from the leaves surface. Air movement is one of the factor that affects the evaporation of water vapour. A group of student carried out an experiment to study the effect of air movement on rate of transpiration of plants. Diagram 1 shows the apparatus used by the students. The experiment was conducted under still air and strong fan speed. Diagram 1 The time taken for the air bubble in the capillary tube to
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site. 5. The Inhibitor is subsequently‚ removed. 6. The Transcription factor can now join to the DNA‚ initiating transcription (production of mRNA from DNA) SiRNA: 1. An enzymes cuts up a piece of double stranded mRNA. 2. This makes little double stranded fragements‚ called SiRNA. 3. One strand of the SiRNA binds with a enzyme. 4. The enzyme is brought to the mRNA‚ due to the free bases of the SiRNA binding to a complimentary region on the mRNA. 5. The enzyme
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TOPIC 5 ECOLOGY 5.1.1 The study of the interactions between organisms and their environment. ENVIRONMENT = all the factors that affect an organism. 5.1.1 ABIOTIC FACTORS = non-living factors in an environment BIOTIC FACTORS = living factors in an environment ABIOTIC BIOTIC water fish chemicals in water aquatic plant depth fungi temperature protists - algae light Relationship - Photosynthesis Wet lands = also called ‘estuary’ Ecosystem: - A stable‚ settled
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assist students wishing to excel on the SAT and in college courses. According to the College Board’s website‚ AP Biology courses are designed to be the equivalent of a college introductory course‚ usually taken during a biology major’s first year of college. Students who choose to take AP Biology may be allowed to skip over introductory biology courses and enroll in courses in which biology is a prerequisite. Because universities grant college credit for this course‚ they require that the textbooks
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Edusmart Study Centre Biology Notes Class 10 1. How are our eyes protected? • Eyes are situated in the eye-socket of the skull • Eyelids with eyelash protect from dust and other particles • Tears keep eyes wet ‚ washes away the dust particles and prevent infection • The conjunctiva covers the front portion of the eye except cornea 2. Which are the 3 layers of human eye? • Sclera –The outermost‚ strong layer‚ that gives shape. Its
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BIOLOGY Tingkatan 4 Kertas 2 Dua jam tiga puluh minit PERATURAN PEMARKAHAN Peraturan Pemarkahan ini mengandungi 15 halaman bercetak @ 2011 Hak Cipta MPSM Pahang MARKING SCHEME PEPERIKSAAN AKHIR TAHUN 2011 (TINGKATAN 4) BIOLOGY 4551/2 |No. |Marking criteria |Marks | |1(a)(i) |Able to label P and S.
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SPM Biology Form 4 Notes – Nutrition (Part I) Photoautotrophs Type of Nutrition * Nutrition – process by which organisms obtain energy and nutrients from food‚ for growth‚ maintenance and repair of damaged tissues. * Nutrients – the important substances which are required for nourishment of an organisms. * Living organisms are divided into two groups (based on the nutritional habits): autotrophs and heterotrophs. (i) Autotroph * Autotrophs – organisms that are able to synthesise
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HSC Biology 9.4 The Search for Better Health 9.4-6 You have been looking at the different types of diseases that affect the human body and the natural defence mechanisms that maintain health. In this last part of the module you will look at how increased understanding has led to the development of a wide range of strategies to prevent and control disease. In this part you will have the opportunity to: • discuss the role of quarantine in preventing the spread of disease and plants and animals
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Biology Notes 1.02 Sometimes a practice or belief claims to be science but does not follow the scientific method or cannot be proven reliable through experimentation. These practices are examples of pseudoscience‚ which literally means "fake science." Charms‚ astrology = stars‚ and phrenology= reading the bump on skull 1.03 * In the mid 1600s in the Netherlands‚ the scientist Antonie van Leeuwenhoek developed the first known microscope using a single magnifying lens. He was the first person
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