Memo to Plant Growth Responses Q&A
This memo provides detailed information on plant growth responses. It covers various aspects related to how plants react to their environment and stimuli. Topics include mechanisms, influencing factors, and common plant responses. It serves as a comprehensive guide for understanding plant growth dynamics and optimizing growth conditions.
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ASSET TUTORING REVISION 2020ASSET TUTORING REVISION 2020 Memo to PLANT GROWTH RESPONSES Q & A
This is the section where a practical is ALWAYS asked Sometimes it s the one you have seen in your textbook or power point but often it is a new practical. ALSO it will more than likely link to the Scientific Method see following 2 slides
Q1 Read both questions and determine what each is asking. 1.12 is about a control 1.13 is about phototropism
Q1 continued Memo to Q 1.12 and 1.13 1.12 best answer is B 1.13 st answer is A
Q2 All three questions test your knowledge of auxins and phototropisms Memo: 1 best answer is D 2 best answer is B 3 best answer is C
Q2 Read the text THEN analyse the 2 diagrams THEN read the questions. Q9.1 Be very careful of this question; the text gives you a HUGE clue.
Q3 continued All four of these questions need a lot of reading, analyzing and thinking as they are dependent on your answer to Q 9.1 9.5 What is the: (i) Independent variable? (ii) Dependent variable? (2)
Answers to Question 3 9.5 (i) force of gravity applied in one direction (ii) growth response of the stem (to the force of gravity)
Section C: Q4 Essay your aim is to get full marks Both plants and humans respond to light but in different ways. Explain how stems respond to unilateral light and explain how the eye responds to bright light and how the eye focuses light from an object onto the retina. 1. Read the introduction statement which gives the context and the purpose of the essay. Both plants and humans respond to light but in different ways. This helps you understand what the limits of the question are. * Go to next slide
Analysing an essay topic continued 2. Read and analyse the question which includes the instructions. Underline/highlight the instructions in one colour and the content in another colour. Explain how stems respond to unilateral light and explain how the eye responds to bright light and describe how the eye focuses light from an object onto the retina. 3. Work out a rough plan of the essay 1) Stems, unilateral light, auxins, positive phototropism, bend towards light, how and why 2) Eye, bright light, pupillary mechanism, radial and circular muscles, pupil dilates, how and why 3) Object, cornea, lens, refraction, yellow spot, retina, image, smaller and upside down, how Cross out your rough plan after writing your essay
Now you are ready to write your essay Remember NO introduction in a Life Science essay NO conclusion in a Life Science essay ONLY facts 3 paragraphs Explain = statement ie how it happens and reason ie why something happens Describe = gives the facts Bulleted sentences makes it easier for the essay to be marked Content total = 17 marks Synthesis total = 3 marks o Relevance ONLY give the facts relevant to positive phototropism in stems, pupillary mechanism and focusing. Details on roots or geotropisms or accommodation would mean you would lose this mark. o Logical order very important that all 3 processes are explained in the correct order o Comprehensive write everything you know about all 3 processes. o Overall total = 20 marks
Essay Memo: Explain how stems respond to unilateral light A plant is lying on its side which means the stem is also lying horizontally Auxins are produced at the tip of the stem More auxins move/diffuse to the lower side of the stem Fewer auxins are at the upper side of the stem More auxins on the lower side causes MORE cell growth and more elongation Less/fewer auxins cause less growth and elongation on the upper side Therefore the stem tip grows away from the stimulus of gravity Advantage: stem grows away from gravity and towards light Max 8 of 11
Explain how the eye responds to bright light Pupillary mechanism Radial muscles of the iris relax Circular muscles of the iris contract Pupil constricts/gets narrower Max 5 of 7
Explain how the eye focuses light from an object onto the retina. When light enters eye, it is refracted (bent) by the convex surface of cornea the biconvex surface of lens The image focused on retina is upside down and is reversed from left to right Max 4 of 6 SYNTHESIS R = all facts are relevant to the question; if phototropism is described do not award this mark, if positive geotropism is described do not award this mark L = each process is described in logical order C = comprehensiveness, stem 6/8, pupillary mechanism 4/5, focus 3/4 need to get all of these for the C mark
