KNEC KCSE BIOLOGY TOPICAL QUESTIONS

K.C.S.E Biology Q & A - MODEL 2018PP1QN06

1/7/2020

K.C.S.E Biology Q & A - MODEL 2018PP1QN06

The diagram below illustrates tissue fluid and cells surrounding a capillary.

(i)Name fluid G.
(ii) Give two ways by which fluid G is different from tissue fluid.

answers

(i) (Blood) plasma;
(ii) Has (more large) proteins/blood platelets;
High (hydrostatic) pressure/low pressure of tissue fluid;
Has red blood cells;

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K.C.S.E Biology Q & A - MODEL 2018PP1QN01

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2018PP1QN01

(a) Name the cell organelle found in abundance in the white blood cells.
(b) Give a reason for your answer in (a) above.

answers

a)Lysosomes/golgi apparatus;
b)White blood cells fight pathogens to protect the body, the lysosomes contain lytic enzymes which destroy pathogens;/golgi apparatus synthesize lysosomes which contain lytic enzymes that destroy parthogens;

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K.C.S.E Biology Q & A - MODEL 2017PP2QN03

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2017PP2QN03

The diagram below illustrates the appearance of a plant cell after it had been put in a certain solution.

(a) Explain the appearance of the cell at the end of the treatment.
(b) Explain the results obtained if a red blood cell is subjected to the same treatment.
(c) Explain why transfusion with distilled water is not recommended for a dehydrated patient.

answers

(a) The cell is turgid; its cell sap was hypertonic (compared to the solution in which it was placed); by osmosis, water moved into the cell across its cell semi-permeable membrane, (swelling and becoming turgid);
(b)The red blood cell lacks the cell wall; water molecules move across its semi-permeable membrane by osmosis; into its hypertonic medium (inside the cell),cell contents/cytoplasm swelling and bursting haemolyses;
(c)Would haemolyse; due, to lowering of the osmotic pressure of the blood below normal;

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K.C.S.E Biology Q & A - MODEL 2017PP2QN01

30/6/2020

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K.C.S.E Biology Q & A - MODEL 2017PP2QN01

The diagram below represents a nucleus.

(a) Name the structures labelled E and F.
(i) E
F
(ii) State the function of F.
(iii) With reference to the nucleus, state one difference between an animal and a bacterial cell.
(b) Name the plant cell organelle:
(i) that stores chlorophyll
(ii) responsible for intracellular digestion.
(c) State two main functions of the vacuole in the amoeba.

ANSWERS

(a) E—Nucleolus;
F — Nuclear pore/nucleopore;
ii. Facilitates movement of materials in and out of the nucleus;
iii. Nuclear material in the bacterial cell is not enclosed within a membrane /prokaryotic, while in animal cell it is enclosed eukaryotic;
(b) i. Chloroplast;
ii. Lysosome;
(c) i. Feeding (food vacuole);
ii. Osmoregulation (contractile vacuole);
iii. Excretion/removal of wastes;

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K.C.S.E Biology Q & A - MODEL 2017PP1QN02

30/6/2020

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K.C.S.E Biology Q & A - MODEL 2017PP1QN02

Below are diagrams of a cell organelle obtained from different organs of an animal

(a) (i) For each organelle state an organ in the urinary system where it is likely to be found.
F
G
(ii) Give a reason for your answers in (a) (i) on page 2.
(b) Name the part of the chloroplast where the following reactions occur:
(i) Carbon(IV) oxide fixation
(ii) Photolysis

answers

(a) (i) F - Kidney;
G - Bladder/Ureter/Urethra;
ii) Kidney - active re-absorption of solutes requires more energy; organelle F has more cristae for attachment of more respiratory
enzymes producing more energy; Bladder/ureter/urethra does not require as much energy/organelle G has less number of cristae hence fewer respiratory
enzymes attached/less energy produced;
(b) i) Stroma;
ii) Grana/granurn;

Comments

State three functions of Golgi apparatus.

30/6/2020

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K.C.S.E Biology Q & A - MODEL 2016PP1QN08

State three functions of Golgi apparatus.

answers

Form vesicles that transport materials to other parts of the cell e.g. proteins.
Transportation secretions to the cell surface for secretion e.g. enzymes and mucus. Packaging of materials such as glycoproteins.
They form lysosomes

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K.C.S.E Biology Q & A - MODEL 2014PP1QN20

28/6/2020

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K.C.S.E Biology Q & A - MODEL 2014PP1QN20

State one function of each of the following cell organelles:
(a) golgi bodies
(b) lysosomes.

ANSWERS

(a) Packaging of substances/glycoproteins/ transportation of glycoproteins;
Secretion of synthesized proteins and carbohydrates;
Formation of lysosomes/modification of carbohydrates to form glycoproteins; (1 mark)
(b) Digestion of food/Breakdown large molecules;
Destroy worn out organdies or cells/tissue;

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K.C.S.E Biology Q & A - MODEL 2013PP1QN09

26/6/2020

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K.C.S.E Biology Q & A - MODEL 2013PP1QN09

State one way in which each of the following is structurally adapted to its function:
(a) neurone;
(b) mitochondrion.

answers

a)Presence of myelin sheath for insulationlincreases transmission; Axon for transmission of impulses;
Large cell body controls activites of cell; Nerve endings/dendrites receives impulses from receptors cells;
Node of Ranvier speeds up impulse transmission.
(b) Inner membrane highly folded/cristae to increase S A for attachment of (respiratory) enzymes.

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K.C.S.E Biology Q & A - MODEL 2013PP1QN02

26/6/2020

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K.C.S.E Biology Q & A - MODEL 2013PP1QN02

The diagram below represents a cell as seen under an electron microscope.

(a) Based on the diagram, state whether it represents an animal cell or a plant cell.
(b) Give two reasons for your answer in 2(a) above.
(c) Why is the palisade layer a tissue?

answers

(a) Animal cell;
(b) Has cell membrane only/has no cell wall;
Has numerous small vacuoles;
Has central nucleus;
(c) Consists of many similar cells performing the same function;

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K.C.S.E Biology Q & A - MODEL 2012PP1QN30

26/6/2020

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K.C.S.E Biology Q & A - MODEL 2012PP1QN30

Name the organelle that is involved in each of the following:
(a) manufacture of lipids
(b) formation of lysosomes

answers

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What is the function of contractile vacuoles in amoeba?

26/6/2020

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K.C.S.E Biology Q & A - MODEL 2012PP1QN27

What is the function of contractile vacuoles in amoeba?

answers

Removes excess water/waste products/Homeostas is;

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K.C.S.E Biology Q & A - MODEL 2012PP1QN03

26/6/2020

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K.C.S.E Biology Q & A - MODEL 2012PP1QN03

The figure below is a fine structure of a generalised animal cell as seen under an electron microscope.

(a) Name the parts labelled A and B.
A
B
(b) How is the structure labelled B adapted to its function?

answers

(a) (i) A - nucleopore;
B - Rough Endoplastic Reticulum;
(b) Surface covered with ribosomes; for protein synthesis;
Has interconnected channels: for transportation of proteins;