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Biology Essays: form 1 - 4.

Biology#Chemistry#KLB#Form1-Form4#Pastpapers#Notes#SaveMyNotes-#Blitz-#Znotes-#Cambridge-#Edexcel-#IGCSE-past-papers-Notes-IB-Olevel-Alevel-As-A2-Notes-Exams by Ndovu ni kuu

Aug 21, 2024

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This application features form one to form four Kcse standardized biology essays

Biology Essays: form 1 - 4 features form one to form four Kcse standardized biology essays. The mobile software has assembled all biology essays within the the entire syllabus. The application is set to equip learners with knowledge, skills and expertise on how to tackle questions pertaining essays in Biology. The application features the following Biology essays:

1. Essay 1 - Adaptation of the Cell to its functions

2. Essay 2 - Animal & Plant cells adaptations.

3. Essay 3 - Mammalian body adaptations against infections.

4. Essay 4 - Higher plants adaptations to their functions.

5. Essay 5 - Adaptations of mammal’s teeth to their functions.

6. Essay 6 - beans and maize ingestion to their absorption.

7. Essay 7 - Adaptations of small intestines to their functions.

8. Essay 8 - Homeostatic functions of the liver in mammals.

9. Essay 9 - Conditions necessary for photosynthesis.

10. Essay 10 - Adaptations of Ileum to its functions.

11. Essay 11 - HOMEOSTASIS.

12. Essay 12 - Route taken by water from root to evaporation.

13. Essay 13 - Adaptations of mammalian heart to functions.

14. Essay 14 Double circulation in mammals.

15. Essay 15 - Process of Urine Formation in mammalian kidneys.

16. Essay 16 - Roles of Hormones during Homeostasis.

17. Essay 17 - Diabetes mellitus & Insipindus, glucose regulation.

18. Essay 18 - Effects of Abiotic factors on plants.

19. Essay 19 - Causes, Effects and Measures for water pollution.

20. Essay 20 - Xerophytes and Hydrophytes adaptations to habitats.

21. Essay 21 Differences between wind & Insect Pollinated flowers.

22. Essay 22 - Happenings in a flower from pollination to fruit Dvt.

23. Essay 23 - Adaptations of the Fenale Reproductive Human System.

24. Essay 24 - Gaseous Exchange Process in Terrestrial Plants.

25. Essay 25 - Gaseous Exchange adaptations in Mammals.

26. Essay 26 - Structure and Function of the mammalian Skin.

27. Essay 27 - Roles of hormones in the menstrual Cycle.

28. Essay 28 Secondary Growth.

29. Essay 29 Mechanisms of opening and closing of the Stomata.

30. Essay 30 - NATURAL SELECTION.

31. Essay 31 - Lamarck's and Darwin's Theories of Evolution.

32. Essay 32 - Adaptations of Blood components to their functions.

33. Essay 33 - Adaptations of Vertebrates to their functions.

34. Essay 34 - LOCOMOTION &

Adaptations of a fish.

35. Essay 35 - Supportive tissues in plants and adaptations.

36. Essay 36 REFLEX ACTION.

37. Essay 37 THE NITROGEN CYCLE.

38. Essay 38 - How Tropisms adapt plants to their habitats.

39. Essay 39 - Evidences of the organic Evolution.

40. Essay 40 - Structure and functions of parts of mammalian Ear.

41. Essay 41 - Ways in which Prey avoid their predators.

42. Essay 42 - Symbiosis and other relationships in an ecosystem.

43. Essay 43 - Parasites - Measures, prevention and control.

44. Essay 44 PROCESS OF MITOSIS.

45. Essay 45 Mechanisms that hinder selfpollination & fertilization.

46. Essay 46 - Adaptations of seeds & Fruits for dispersal.

47. Essay 47 - Mutations, mutants and mutagens.

48. Essay 48 - TRANSPIRATION.

49. Essay 49 - Adaptations of the mammalian Eye.

50. Essay 50 - Roles of hormones in plant growth and development.

51. Essay 51 - How Evolution may result to formation of new species.

52. Essay 52 Utilization of Anaerobic Respiration industries.

53. Essay 53 - DIGESTION..

54. Essay 54 - Factors affecting Enzyme Activities..

55. Essay 55 - Adaptations of the male reproductive systems in humans.

56. Essay 56 - Structure and functions of muscle tissues found in humans.

57. Essay 57 - Economic importance of kingdom monera and fungi.

58. Essay 58 - Adaptations of Nervous Systems to its functions.

59. Essay 59 Compositions and functions of mammalian blood.

60. Essay 60 - Effects affecting the human eye and their corrections.

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Strategies for answering exam and test questions

Click on the accordions below to see more information about how best to tackle the following question types in your exam.

Multi-choice questions

Things to remember about multi-choice questions

• Read through the options and try to eliminate the ones that aren’t right . Multi-choice questions usually have one option that is obviously wrong, and three or four others that are similar.  It is important to look carefully at how they are worded in order to select the correct  answer.
• Don’t struggle over a question . Do all of the easy questions first and come back to harder ones later to maximise efficient use of test/exam time.
• Answer all the questions . Even if you are not sure, your educated guess may well be correct. It is better to have a go at answering a question than potentially miss out on a mark.
• When you check back through your paper and think an answer is wrong - change the answer . Research indicates that you will probably be correct in doing so.

Short answer questions

Short answer questions range from a sentence or two through to a paragraph in length.

• Keep to the point . Short answers are usually two-three sentences.
• Main ideas . Your answers should incorporate the key points, words, ideas and phrases the marker will be looking for.
• Leave one or two lines after each answer . This is so you can add important points later on.
• Try to answer all the questions .  If you don’t know the complete answer, put down what you do know, as this is likely to get you some marks.

Exam essay questions

The advice here is in four parts: Time allocation | Task analysis | Planning | Presentation

Time allocation

• Use the reading time at the start of the exam to choose which essay questions you will answer .
• Check how much time you might have to answer each essay question , and stick to it. You can come back and add more to your answer in your revision time at the end of the exam session.
• If you haven’t finished your answer, jot down the rest in note form . This will show the marker what you know, and you might get some marks for it.

Task analysis

• Read the question carefully .
• Underline or highlight the content words . What is the topic?
• Pick out the instruction words in the question, e.g. identify, describe, compare and contrast, evaluate. What are you being asked to do with the topic?
• Take some time to think and plan your answer . For example: use the reading time to select which essay questions you will answer. Then use the start of the writing time (5-20mins) to make notes of all the points you remember that are relevant to the essay. General guide for timing: for 30 minutes of writing, allow 5-7 minutes for planning .
• Plan out the structure by organising your points into a logical order :e.g. by numbering them according to intended sequence.
• General writing rule for exam essays - one paragraph = one point . Follow standard essay-writing procedure, e.g. start with a topic sentence that contains your key point, and then support this with examples, explanations, and evidence.

Presentation

• Make sure your handwriting is legible . Markers should not have to decipher your handwriting. If your handwriting is illegible, it could compromise your marks.
• Make sure that you can express ideas effectively in terms of sentence structure and word use .  Incoherent sentences and incorrect terminology will likely result in the marker not being able to understand your answer properly.
• Don’t worry too much about punctuation, grammar and spelling . Getting your ideas down is more important than ‘perfect’ writing (and markers usually take this into account given that students are writing under pressure in an exam situation). However, you do need a basic level of competency in these areas: an answer that lacks any punctuation and is full of spelling mistakes will probably be incoherent for the marker.
• Don't waffle . Get straight to the point in terms of your answer so that you don’t waste time and word space on unessential or irrelevant detail. Planning your essay beforehand is key to avoiding waffle.

Problem solving questions

Usually these types of questions target formulae, steps in a process, or rules.

• Make sure you write down relevant formulas, equations, and rules . Important: For numerical problems involving computation, make sure you include the appropriate mathematical units in your final answer (e.g. ml, m/sec).
• Clearly show the steps you have taken in working out the answers.
• If necessary, write notes to explain your answers .
• Do the easier answers first , and return to the difficult ones later.

Growth and development topic should be there

FUNDAMENTALS OF BIOLOGY

CHAPTER 2: CELL BIOLOGY & ORGANISATION

CHAPTER 3: MOVEMENT OF SUBSTANCES ACROSS A PLASMA MEMBRANE

CHAPTER 4: CHEMICAL COMPOSITION IN A CELL

CHAPTER 5: METABOLISM & ENZYMES

CHAPTER 6: CELL DIVISION

CHAPTER 7: CELLULAR RESPIRATION

PHYSIOLOGY OF HUMANS & ANIMALS

CHAPTER 8: RESPIRATORY SYSTEMS IN HUMANS & ANIMALS

CHAPTER 9: NUTRITION & THE HUMAN DIGESTIVE SYSTEM

CHAPTER 10: TRANSPORT IN HUMANS & ANIMALS

CHAPTER 11: IMMUNITY IN HUMANS

CHAPTER 12: COORDINATION & RESPONSE IN HUMANS

CHAPTER 13: HOMEOSTASIS & THE HUMAN URINARY SYSTEM

CHAPTER 14: SUPPORT & MOVEMENT IN HUMANS & ANIMALS

CHAPTER 15: SEXUAL REPRODUCTION, DEVELOPMENT & GROWTH IN HUMANS & ANIMALS

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BIOLOGY ESSAYS FOR EASY REVISION. 1(a

Describe the digestion of a starchy meal along the human alimentary canal. S (13 mks) Answer-Starch in food is first broken down in the mouth by action of teeth/ chewing; This increases the surface area exposed enzyme action; saliva contains salivary amylase which breaks down some starch to maltose; saliva has a slightly alkaline pH which is optimum for the enzyme; The food moves down to the oespophagus and stomach; where the acidic pH, due presence of dilute Hcl, prevents further action of salivary amylase; In the duodenum, pancreatic amylase continues digestion of starch to maltose; Pancreatic amylase is produced in the pancrease; and enters the duodenum through pancreatic ducts; the acidic chyme is neutralized by the sodium bicarbonate in bile/ pancreatic juice; Maltose digestion continues in the ileum; whose walls secrete succus entericus/ intestinal juice; which contains enzyme maltase; which breaks down maltose to glucose; (Max 13 marks) (b) Describe the process of urea formation. (7marks) answer Excess amino acids / proteins; are transported to the liver 2. (a) Describe how gaseous exchange occurs in terrestrial plants. (13 marks) Answer Gaseous exchange takes place in a spongy mesophyl During the day air diffuses into large air spaces of spongy mesophyll; through stomata; the Carbon (IV) Oxide in the air diffuses into Photosynthetic cells; in solution form; during photosynthesis Carbon (iv) Oxide is used while oxygen is produced. Oxygen diffuses out of the leaf; through stomata; During the night; air diffuses into the air spaces (of spongy mesophyll), the air dissolves into film of moisture; then oxygen diffuses into the cells; and is used in respiration during which carbon (iv) oxide is produced, the Carbon (iv) Oxide diffuses out of the leaf; through stomata; due to concentration/diffusion gradient; Gaseous exchange takes place through epidermis (of young leaves and stems); epidermis of the root carries out gaseous exchange with air in the soil; some plants have pneumatophores/breathing roots; in which gaseous exchange occurs through lenticels; (found in

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Absorption by Roots, Osmosis, and the Ascent of Sap • Roots and leaves are the main absorbing organs of the plant. ® Roots absorb water and minerals from the soil ® Leaves take in O 2 & CO 2 from the atmosphere • Reasons why plants need water: a) Turgidity-Cell sap in vacuoles lends rigidity to the plant b) Manufacture of food-Water is used as a raw material in photosynthesis along with CO 2 c) Translocation-Minerals absorbed by roots and carbohydrates prepared by leaves are transported in solution form d) Cooling of plant-When excess water is removed (by transpiration), the plant cools • Minerals and their Functions: a) Nitrogen-protein synthesis; growth b) Magnesium and iron-synthesis of chlorophyll c) Potassium-constituent of protoplasm; maintains osmotic balance in the cell; opening and closing of stomata d) Phosphorus-promotes nuclear and cell division e) Calcium-maintains the semi-permeability of the cell membrane f) Sulphur-constituent of amino acid (cysteine) g) Zinc-leaf formation • These minerals are taken in the form of ions/radicals; (Nitrogen absorbed as nitrates) • Functions of Roots: i. Fix the plant in soil ii. Absorb water and minerals from the soil iii. Conduct the absorbed substances through its tissues to the upper parts of plant • Adaptations of Roots: i. Branching nature-provides large surface area ii. Thin, freely permeable cell wall-allows movement of minerals in and out of cell by diffusion iii. Semi-permeable cell membrane-permits entry of water and restricts entry of salts by osmosis iv. Concentration of H 2 O in cell sap-in root hair is less than that of soil-helps in absorption of water by osmosis

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