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BIOLOGY Paper 1 Questions and Answers - KCSE 2022 Past Papers

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 QUESTIONS;

Answer all the questions in the spaces provided.

  • State two reasons why humans are not commonly used as specimens for genetic studies.(2marks)

BIOP1qn2

  • cells become specialised as E(1 mark)
  • cells increase in size as F(1 mark)
  • State two environmental conditions that can lead to the formation of carboxyhaemoglobin in the human body. (2 marks)
  • Explain the effect of carboxyhaemoglobin in the human body. (2 marks)
  • being elastic
  • having pleural fluid.

BIOP1qn5

  • Identify the Kingdom to which the organism belongs. (I mark)
  • State two features shown on the diagram that are characteristics of this Kingdom. (2 marks)
  • zygote    (1 mark)
  • testa.  (1 mark)
  • Name the hormone responsible for the development of a deep voice in humans. (I mark)
  • Differentiate between a population and a community as used in ecology. (I mark)
  • Explain one negative effect of the use of herbicides on human health. (1 mark)
  • State two ways through which energy is lost from one trophic level to the next in a food chain. (2 marks)

BIOP1qn8

  • Identify the apparatus. (I mark)
  • State its function.  (1 mark)
  • Give two reasons why anaerobic respiration yields less energy than aerobic respiration. (2 marks)
  • Explain why fats are not efficient respiratory substrates. (2 marks)
  • Which of the two ions intake will be affected if the plant was sprayed with a chemical that inhibits respiration. (1 mark)
  • explain your answer in 10(a)(i).  (2marks)

BIOP1qn10

  • Name the stage of cell division illustrated. (1 mark)
  • Give a reason for your answer in 11(a)(i). (1 mark)
  • In the space below, illustrate the next stage of cell division after the one illustrated above.
  • Explain the disadvantage of in-breeding among living organisms. (2 marks)
  • Explain why protozoans do not require an elaborate system of gaseous exchange. (2 marks)

BIOP1qn13

  • protein synthesis (1 mark)
  • transport of lipids (1 mark)
  • Name two organisms that belong to the Kingdom Protoctista. (2 marks)
  • Explain why only the fine adjustment knob should be used when focusing a specimen using the high power objective lens of the light microscope. (2marks)
  • An animal cell was viewed under a light microscope using objective lens of *75 and eye piece lens of ×10. Determine the total magnification of the image. (2 marks)
  • A goat and a sheep are both herbivores. Explain why the two can comfortably exist in the same ecosystem. (2 marks)

BIOP1qn15

  • G    (1 mark)
  • H  (1 mark)
  • Explain why the bones of the cranium are fused. (1 mark)
  • Account for the above observation. (3 marks)
  • Name the evolution theory that supports this observation. (1 mark)
  • Suggest the likely identity of substance K. (1 mark)
  • Explain how the substance may have caused coleoptiles to curve. (3 marks)
  • Explain the role of antidiuretic hormone when the human blood water level is below normal. (3 marks)
  • Identify gas L. (1 mark)
  • Account for the difference in the volume of gas L produced at pH values 4.2 and 9.2. (3 marks)
  • Name the causative agent of Trichomoniasis. (1 mark)
  • fallopian tube
  • nasal lining.
  • Name the agent of pollination in a maize plant. (1 mark)

BIOP1qn24

  • Determine the carrying capacity of the ecosystem. (1 mark)
  • Account for the change in population for the first 15 years. (3 marks)

BIOP1qn25

  • Suggest the likely habitat for the plant. (1 mark)
  • Explain your answer in 25(a). (3 marks)

MARKING SCHEME

  • Humans take longer to grow/ mature (for observations/ inferences to be made);
  • Not convenient/cannot be caged/ contained (under some set experimental conditions);
  • It is unethical; OWTTE

KCSE2022BioP1Ans2

  • Burning of carbon in inadequate supply of air/oxygen; s:/k
  • (Excessive) supply/emission of carbon (II) oxide (exhaust fumes/burning jiko):
  • Carboxyhaemoglobin is a stable compound/ does not dissociate/break; haemoglobin is not free/released to transport the oxygen; resulting in suffocation/ death;
  • To accommodate varied volumes of air/respiratory gases (during the breathing process);
  • Shock absorber/ shield the (delicate) lungs against mechanical damage/friction (with ribs/ adjacent bones);
  • No membrane-bound organelles/fewer organelles;
  • No definite nucleus/prokaryotic/primitive nucleus;
  • Presence of flagella;
  • Unicellular;
  • Integuments;
  • Testosterone;
  • A population is a group of organisms of the same species co-existing/living together in a particular habitat while a community is a group of plant and animal/different species living together in a given habitat;
  • Herbicides (gradually) accumulate in food chains (plant/ animal tissues) which when fed on by human beings slowly accumulate in human tissues (when inhaled/come in contact with the body) causes diseases/poisoning/ affecting the working of some body organs/systems/some are carcinogenic/cause death;
  • Elimination of wastes/excretion/defeacation/urination:
  • Decomposition of organic matter/unconsumed parts of organisms;
  • Through respiration;
  • (A pair of) forceps;
  • Picking up/holding specimens;
  • Incomplete/partial breakdown/ oxidation of substrates;
  • Inadequate/shortage of oxygen;
  • Fats are insoluble in water hence not easily transported to body tissues;
  • Fats require more oxygen to be oxidized;
  • Iodide ion (I');
  • The uptake of I is done by active transport; which is respiration/energy-dependent which when inhibited consequently affects/impairs the active transport process which is responsible for the uptake of the ions;
  • The visking tubing being semi-permeable; allowed selective passage of the iodine molecules into it; which react with starch to form a blue-black colour/ starch molecules are bigger than iodine-could not pass out through the pores into the beaker;
  • Metaphase I;
  • Spindles have formed/ bivalent pair of chromosomes aligned at the equator/homologous chromosomes align at the equator;

KCSE2022BioP1Ans11

  • (Inbreeding) hampers variation; resulting in the propagation of undesired genes (some of which might be weaker/ lethal), to subsequent generations;
  • They have a large surface area to volume ratio; diffusion (across its cell membrane) is sufficient for its gaseous exchange needs;
  • Number of cells in the field of view = 6                Diameter of field of view  = 1.5 mm; Size of each cell (in the field of view) − ( 1.5 / 6 x1000) um                                                       =  250um;
  • Golgi bodies/apparatus/smooth endoplasmic reticulum;
  • Paramecium/Paramecia;
  • Trypanosoma;
  • Chlamydomonas;
  • The distance/ space for manipulation on the stage is limited; to avoid crushing the slide/ specimen;
  • Total magnification = Eye piece lens x objective lens power;                                =10 × 75                               =x750;
  • A goat is a browser (mainly feeds on shrubs/leaves) while a sheep is a grazer, (mainly feeding on grass); there is no competition for (the critical common resource) food needed for their survival;
  • Joint G- Hinge joint;
  • Joint H- Gliding/sliding joint;
  • (To form firm strong joints so as) to protect the (delicate) brain enclosed therein;
  • There was a greater decline in the number of white mice compared to the black ones; the white mice were selected against (by nature); they did not camouflage (well) with the surroundings because of their bright white colour/ could easily be seen by the jackals/predators unlike the black mice;
  • (Charles Darwin's theory of) natural selection; 
  • Auxins/Indole-Acetic Acid;
  • The substance caused faster division/elongation of cells on the side it was applied; giving rise to faster growth compared to the opposite side; resulting in a curvature/ bending away from the side where it was applied;
  • (When the blood water level is below normal), the body is dehydrated; more antidiuretic hormone (ADH) is secreted the antidiuretic hormone stimulates the kidney tubules (distal convoluted tubule/ collecting ducts); increasing their permeability to water, water is reabsorbed into the bloodstream until the osmotic balance is attained;
  • More gas was produced at pH 9.2 (higher pH); this basic/ alkaline pH; was favourable for the optimal working of the enzyme (catalase) in the irish potatoes; lower pH/acidic medium (4.2) did not favour the optimal working of the enzyme;
  • Propel the ovum/zygote/sperm into the oviduct/ fallopian tube;
  • Trap solid/dust particles in the inhaled air;
  • The population increased exponentially; because the organisms had adjusted to the environment; conditions were favourable (for reproduction/breeding); there was adequate food/water/ space/no competition (for resources); there were no diseases; more reproduced/ fewer deaths;
  • Aquatic/fresh water/swampy/marshy environment;
  • Broader leaf surfaces; to increase the surface area for the loss of excess water; the broad surfaces have more stomata on the upper leaf surfaces to enhance loss of excess water; presence of shallow roots to minimize absorption of water; flowers raised above the water surface to enhance pollination; broad leaf surfaces for buoyancy;

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kcse biology essays form 1 to 4 pdf download

  • LESSON NOTES
  • LESSON PLANS
  • 2021 SCHEMES
  • POWERPOINT NOTES
  • FORM 1 EXAMS
  • FORM 2 EXAMS
  • FORM 3 EXAMS
  • FORM 4 EXAMS
  • COMPREHENSIVE 1-4
  • TOPICAL QUESTIONS
  • K.C.S.E SYLLABUS
  • REVISION MOCKS
  • K.C.S.E REVISION
  • 2018 K.C.S.E PAPERS
  • 2017 K.C.S.E PAPERS
  • 2016 K.C.S.E PAPERS
  • 2015 K.C.S.E PAPERS
  • 2014 K.C.S.E PAPERS
  • 2013 K.C.S.E PAPERS
  • 2012 K.C.S.E PAPERS
  • 2011 K.C.S.E PAPERS
  • 2010 K.C.S.E PAPERS
  • 2008 K.C.S.E PAPERS
  • 1996-2009 K.C.S.E PAPERS
  • TOPICAL PAST PAPERS
  • SECONDARY F1-4
  • REVISION NOTES STD 4-8
  • SCIENCE NOTES STD 4-8
  • SOCIAL STUDIES NOTES STD 4-8
  • COMPREHENSIVE NOTES STD 4-8
  • SCIENCE POWERPOINT
  • SOCIAL STUDIES POWERPOINT
  • K.C.P.E TOPICAL REVISION
  • BEST & WORST INSHAS
  • 2018 K.C.P.E PAST PAPERS
  • 2000-2017 K.C.P.E PAPERS
  • SCHEMES STD 4-8
  • GRADE 1 EXAMS
  • GRADE 2 EXAMS
  • GRADE 3 EXAMS
  • GRADE 1 NOTES & CLASS READERS
  • GRADE 2 NOTES & CLASS READERS
  • GRADE 3 NOTES & CLASS READERS
  • GRADE 1 SCHEMES OF WORK
  • GRADE 2 SCHEMES OF WORK
  • GRADE 3 SCHEMES OF WORK
  • GRADE 1 CURRICULUM
  • GRADE 2 CURRICULUM
  • GRADE 3 CURRICULUM
  • GRADE 1-3 SYLLABUS

IMAGES

  1. Download KCSE Biology Form 1-4 Revision (Notes + Papers) APK

    kcse biology essays form 1 to 4 pdf download

  2. KCSE Summit Revision Biology Vol 1

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  3. KNEC KCSE 2019 Biology Paper 1 (with Marking Scheme)

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  4. KCSE Biology Paper 1, 2018 with Marking Scheme (Answers)

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  5. KCSE Biology Paper 2 2017 Exam questions with Answers (KNEC Past Paper

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  6. Biology KCSE Revision Questions and Answers Form One to Form Four

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VIDEO

  1. Biology form 1

  2. Biology Revision

  3. 2019 KCSE Biology Paper 1 Question 23

  4. 2021 KCSE BIOLOGY PAPER 1 QUESTION 18

  5. 2023 Biology p2 Section B essay prediction

  6. 2021 KCSE BIOLOGY PAPER 1 QUESTION 8

COMMENTS

  1. PDF KCSE BIOLOGY BIOLOGY ESSAY QUESTIONS WITH MARK SCHEMES 1. Explain the

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