biology essay 2020 kcse

The ZIP folder contains PDF files of "Biology KCSE Past Papers with Answers." The KCSE years covered include: 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, and 2023. All the question papers, namely Paper 1, Paper 2, and Paper 2, are present for all the years. Also, answers or marking schemes are present for all the years except 2012 and 2023. We are making an effort to obtain the marking schemes for 2012 and 2023 as soon possible. All the marking schemes are the original KNEC answers for each question paper. They are all computer typed instead of being handwritten, making them easily readable. Downloading all the papers can benefit learners immensely, especially KCSE candidates who desire to boost their biology grades. Teachers can also use the papers and their marking schemes to facilitate learning among their students.

• Category: Past Papers with Marking Schemes
• Level: Form 4
• Subject: BIOLOGY

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Download KCSE Biology Past papers 2020

Download KCSE Biology Past papers 2020. Both papers 1 and 2 Biology KCSE Past questions and answers PDF free download 2020.

You can download the Kenya Certificate of Secondary Education past question papers from this page. All the questions here are provided for educational purposes and we strongly believe will prove very useful to all the students preparing for the KSCE examination.

The Kenya Certificate of Secondary Education (KCSE) examination is  an examination that is offered after a four-year cycle in secondary education . The examination is normally offered in November/December each year. It is open to all bona fide residents of Kenya who meet the examination requirements as stipulated by KNEC.

Is the KCSE certificate important?

The KCSE certificate is  one of the critical documents that Form Four leavers must produce before joining any tertiary institution or getting a job . The Kenya National Examination Council (KNEC) announces the release of the documents once a national exam is complete, after which students can organize to collect them.

Is KCSE equivalent to GCSE?

In the UK, an A-level qualification refers to the subject-based qualifications that can lead a university to further their studies, training or work. Similarly, at the end of four years in high school, students in Kenya sit for the KCSE examination, which could be considered an A-level qualification in the UK.

A-levels are KCSE equivalent in the UK since they are acceptable in most UK universities as an equivalent to GCE A-levels when seeking admission.

What is the secret to passing the KCSE?

Reading your lesson notes regularly accompanied with the study of past exam papers is the major key to succeeding in your KSCE examination. Understand that every subject is equally important and put more effort into those subjects that will likely give you fewer marks as well.

Groups of Subjects in the KCSE

Science subjects.

• Chemistry Paper 1
• Chemistry Paper 2
• Chemistry Paper 3 (KCSE Chemistry Practicals)
• Physics Paper 1
• Physics Paper 2
• Physics Paper 3 (KCSE Physics Practicals)
• Biology Paper 1
• Biology Paper 2, and
• Biology Paper 3 (KCSE Biology Practicals)

Alternatively, a student may opt for a general science paper.

Humanities Subjects

The humanities subjects include the History and government paper or simply history paper, Ire paper, Christian religious education paper (CRE paper), geography paper e.tc.

KCSE Technical and Applied Subjects

These subjects include:

• Business studies paper,
• Agriculture paper,
• computer studies paper,
• home science paper,

Available KCSE Biology Past papers 2020

Below are the available KCSE Biology Past papers 2020 in PDF

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Biology KCSE Past Papers and all marking schemes free downloads

FREE BIOLOGY KCSE 2008 PAST PAPERS AND ANSWERS

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In case you are looking for free KCSE Biology Past Papers and their marking schemes, then you can download them here free. Simply click on the respective links below to download the free Biology KCSE past papers and their marking schemes per year.

• 2008-KCSE-BIOLOGY-PAPER-1-MS

Click here to download free

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• 2012-KCSE-BIOLOGY-PAPER-1
• 2012-KCSE-BIOLOGY-PAPER-2
• 2012-KCSE-BIOLOGY-PRACTICAL-PAPER-3

Click here for a free download

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• 2017-KCSE-BIOLOGY-PP2-MARKING-SCHEME
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• 2019 KCSE BIOLOGY PAPER 2 MARKING SCHEME
• 2019 KCSE BIOLOGY PAPER 2 QUESTION PAPER
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Biology Paper 2 Questions and Answers - KCSE 2021 Past Papers

« Previous Topic Biology Paper 1 Questions and Answers - KCSE 2021 Past Papers

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SECTION A (40 marks) Answer all questions in this section in the spaces provided.

• Name the Class to which the organism belongs. (1 mark)
• Using observable features from the photograph, state two reasons for your answer
• State two ways in which the organism is important to the environment. (2 marks)
• Name the Kingdom to which bacteria belong. (1 mark)
• Name two bacterial diseases in human beings. (2 marks)
• State two adaptations of the frog's skin to gascous exchange. (2 marks)
• Explain how the human nasal cavity is adapted to gaseous exchange. (3 marks)
• Explain why the amoeba does not require an elaborate gaseous exchange system. (2 marks)
• Name the respiratory disease caused by Bordetella partusis (1 mark)

• Name the substance produced by the part labelled G. (1 mark)
• State two functions of the substance named in 3(a)(i). (2 marks)
• Name the part labelled E. (1 mark)
• Explain the function of the part labelled F to the mammal.(2 marks)
• Name one part of the human body where the cornified layer is thickest. (1 mark)
• Give a reason for your answer in 3(c)(i). (1 mark)
• Two dogs with black fur mated and produced an offspring with both black and brown fur. Given letter N represents the gene for black fur, determine the phenotypic ratio of the offspring. (5 marks)

• Explain why this trait is only found in males. (2 marks)
• Name one other trait that only appears in males(1 mark)
• State the role of sunlight in the formation of strong bones. (1 mark)

• Name the part of the vertebral column shown. (1 mark)
• Name the part labelled H.
• State three ways in which the vertebra shown is adapted to its functions.
• The photographs below show a hairy pinna in a human ear.

SECTION B (40 marks) Answer question 6 (compulsory) and either question 7 or 8 in the spaces provided after question 8.

• Name the physiological process taking place when the concentration of luteinizing hormone is highest. (1 mark)
• State the significance of the process named in 6 (b) (i). (1 mark)
• Determine the concentration of progesterone hormone at which the endometrium is thickest. (1 mark)
• Explain your answer in 6(c)(i). (1 mark)
• State two roles of progesterone hormone in humans. (2 marks)
• Name two sites where progesterone hormone is produced in the human body. (2 marks)
• Name another hormone, apart from the luteinizing hormone, that inhibits the secretion of progesterone hormone. (1 mark)
• Predict the concentration of progesterone hormone seen days after the study period if fertilisation did not take place. (1 mark)
• Give a reason for your answer in 6(9)(i). (1 mark)
• Name the part of the human body where the luteinizing hormone is produced. (1 mark)
• Explain the role of the placenta during pregnancy. (10 marks)
• Explain features and mechanisms that hinder self pollination and self fertilisation. (10 marks)
• Describe how the xylem tissue is structurally adapted to its functions. Describe no (5 marks)
• Describe the functions of blood in the human body.(15 marks)

MARKING SCHEME

• Diplopoda;(2 marks)
• Two pairs or walking legs per segment;
• Many segments:
• Decomposes the organic matter/enriches soil fertility
• Aerates the soil through its movements/burrowing)
• Cholera, Typhoid, Tetenus, Siphillis, Tuberculosis, (first two)
• Moist to dissolve respiratory gas for faster gaseous exchange
• Thin Lined with a one-cell-thick epithelium for faster diffusion of respiratory gases
• Highly vascularized for faster/efficient transportation of respiratory gases Any two
• Lined with hair; to trap dust particles/foreign materials/purify (the incoming) air,
• Has mucus; to moisten/warm the incoming air
• Has a large surface area to volume ratio; diffusion (across its cell membrane) is adequate;
• Whooping cough;
• keeps the skin moist/suppleton
• acts as an antiseptic; - accept kills bacteria
• makes the skin/hair water repellant / water proof
• Sweat pore;
• Thermoregulation; lies flat or erects (on the skin surface) when hot/cold to conserve heat or emit excess heat;
• Sole of the feet palm of hands; 
• Thickest because they encounter high friction/hard-walking (soles of feet) and manual work (palms of hands);

• Duchean musular dystrofy
• Premature baldness;
• Sunlight enables the skin to synthesize vitamins Dy which is necessary for the formation of strong bones)
• Sacrum/sacral vertebra; Accept sacral vertabrae 
• Broad transverse processes for articulate with ilium
• Presence of prezygapophysis to articulate with the lumbar  vertebrae
• Large, broad centrum to offer support
• Wide neural canal for passage of spinal cord
• Fused vertebrae to form a rigid/firm structure
• Plants move to reach/access light/water/moisture/carbon (IV) oxide fub (2 marks) (for photosynthesis); they also move to escape harmful environmental conditions/for safety/withstand harsh external forces; as well as for (mechanical) support; To enable fertilization (Max-2 marks) 

• Releases the ovum;
• 100mg/cm 3 bf blood; Accept without units
• Endometrium is thickest when the concentration of progester highest (in preparation for implantation);
• Inhibits production of luteinizing and follicle stimulating hormones
• Stimulating the thickening of the endometrial lining(for implantation)
• maintains pregnancy; -Mause the fust 12 c).
• Corpus luteum/ovary;
• Prolactin hormone;
• Will remain low/keep decreasing any value below 20 mg/cm 3
• The Corpus luteum will have broken down/degenerated
• (Anterior) pituitary gland;
• The placenta plays the respiratory, excretory; nutritive ndocrine xorine/ gland juar barrier; and immunological functions; Exchange of respiratory gases, supply of oxygen-to the foetus' tissues and removal of carbon (IV) oxide from the foetus takes place across the placenta; Nutrients/food substances are also released into the foetus from the mother's system through the placenta; The placenta also serves as a barrier, preventing the mixing of maternal and foetus' blood/poisonous/harmful substances from the mother; Some hormones/enzymesy needed for the foetus' development are also passed from the mother to the foetus through the placenta; Some antibodies needed for the protection of the foetus from infections are also passed from the mother to the focus through the placenta; Some waste products, like urea, are also passed from the foetus through the placenta;
• Dichogamy is mechanisms where either the male or female parts of the plant reproductive organs ripen at different times in some plants; Protandry is when stamens ripen earlier and anthers release their pollen before the stigma is mature while protogyny-refers to where the stigma matures earlier hence becomes ready to receive pollen grains (common in plants of the grass family); Self-sterility/incompatibility; is where pollen grains cannot germinate on the stigma of the same plant but only germinate on a different plant of the same species, hindering self-pollination; Heterostyly; is a condition where stigma, is higher/above the anthen/stamen making it impossible for the pollen to land, accumulate and fertilize the ovules of the same flower) Dioecious; plants have reproductive parts located separately on different plants of the same species discouraging self-pollination) Monoecious; plants have the reproductive parts located at different parts on the same plant, discouraging self-pollination;
• Xylem tissue consists of xylem vessels; and tracheids; Xylem vessels are tubular, long/hollow structures/running loy coudu continuously from the roots through the stem to the leaves, its walls are strengthened with lignin; preventing them from collapsing; the Xulov vessels have bordered pits; to allow pássage of water; Tracheids have chisel-shaped ends and perforated cross-walls;
• It transports vitamins, mineral salts ayd digested food materials to tissues of the body where they are needed) hormones are also transported by blood from the secretory sites to the target tissues/organs" (to bring about the needed hormonal responses); plasma also transports enzymes to tissues where they are required to catalyze certain reactions; waste products (urealcletnia /carbon (IV) oxide) are also transported in the plasma to the excertory organs Erythrocytes are important in the transportation of oxygen from the p lungs to different body tissues; and carbon (IV) oxide from (respiring) tissues to the lungs (for purification); by haemoglobin (a protein in the erythrocytes); Plasma also plays a thermoregulatory role; by distribution of heat Leucocytes protect the body against infections (from bacteria/viruses); The plasma also transports antibodies; throughout the body for defense against pathogens; Platelets play a role in clotting of blood protect damaged body tissues; preventing excessive loss of blood

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2021 KCSE Past Papers with Marking Schemes

DOWNLOAD 2021 KCSE PAST PAPERS AND MARKING SCHEMES

On this page, you can download all the 2021 K.C.S.E Past Papers by KNEC, the Kenya National Examination Council. 

The past papers list includes all the 2021 KCSE Question Papers with their Marking Schemes.

The 2021 KCSE Examination was conducted in March 2022 as a result of interference of the normal Kenyan school calendar due to the Covid-19 pandemic.

Below, download free Kenya Certificate of Secondary Education 2021 KCSE Examinations Past Papers  with Questions and Answers for all subjects.

The list containing the preview of the 2021 kcse examinations papers, includes the following subjects; English, Kiswahili, Mathematics, Biology, Chemistry, Physics, History, Christian Religious Education CRE, Geography, IRE, Agriculture, Business Studies, Computer Studies, Home Science, Woodwork, Art and Design, music, etc.

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2024 END TERM 1 SET 1 FORM 1 2 3 4 EXAMS PLUS MARKING SCHEME

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KCSE 2021 Agriculture Paper 1

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FORM THREE 2024 APRIL ASSIGNMENT FOR EXTENDED HOLIDAY

FORM TWO 2024 APRIL ASSIGNMENT FOR EXTENDED HOLIDAY

FORM ONE 2024 APRIL ASSIGNMENT FOR EXTENDED HOLIDAY

2024 TERM 2 OPENER FORM 2 3 4 EXAMS PLUS MARKING SCHEME

2024 TERM 1 OPENER FORM 2 3 4 EXAMS PLUS MARKING SCHEME

2023 KCSE Past Papers with Marking Schemes

Lukenya High School 2023 KCSE Results

Bahati Girls 2023 KCSE Results

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GRADE 8 SET 22 EXAMS

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2015 KCSE Past Papers and Marking Schemes

2014 kcse past papers and marking schemes, 2013 kcse past papers and marking schemes, 2012 kcse past papers and marking schemes, 2011 kcse past papers and marking schemes, 2010 kcse past papers and marking schemes, 2008 kcse past papers and marking schemes, 1996 – 2009 k.c.s.e past papers and marking schemes, read 2019 kcse knec reports below.

• 2019 KCSE BIOLOGY (231) KNEC REPORT
• 2019 KCSE AGRICULTURE (443) KNEC REPORT  
• 2019 KCSE BUSINESS STUDIES (565) KNEC REPORT
• 2019 KCSE CHEMISTRY (233) KNEC REPORT  
• 2019 KCSE CHRISTIAN RELIGIOUS EDUCATION CRE (313) KNEC REPORT  
• 2019 KCSE ENGLISH (101) KNEC REPORT
• 2019 KCSE HISTORY AND GOVERNMENT (311) KNEC REPORT
• 2019 KCSE KISWAHILI (102) KNEC REPORT  

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