The student observed the housefly whose actual length was 8cm. she used the apparatus named above 6(a) above and the total magnification was X4. Calculate the length of the drawing. Show your working. (3mks)

…………………………………………………………………………………………………………………..

…………………………………………………………………………………………………………………..…………………………………………………………………………………………………………………..

(a) What is classification? (1mk)

…………………………………………………………………………………………………………………..

(b) What is the need for classification? (4mks)

…………………………………………………………………………………………………………………..

Fill the table below by identifying the correct kingdom and appropriate representative in each case (5mks)

kingdom	representative
a)	Hydra
b)	Protozoa
c)	Yeast
d) Monera
e)	Garden pea

Distinguish between magnification and resolution (2mks)

…………………………………………………………………………………………………………………..

Fill the table below (3mks)

Eye-piece lens	Objective lens	Total magnification
X30	(i) ……………………………….	X600
X14	X5	(ii)………………………………
(iii) ………………………	X40	X2000

Study the diagram below and answer the questions that follow

The diagram represents the field of view observed under the light microscope during the form one practical lesson.

If the students counted 10 cells across the field of view, calculate the size of one cell in micrometers. Show your working. (3mks)

…………………………………………………………………………………………………………………..

What is the importance of the following practices in biological preparation of the specimen?
Cutting very thin sections (1mk)

…………………………………………………………………………………………………………………..

Staining the cells using common dyes (1mk)

…………………………………………………………………………………………………………………..

Adding a drop of water on the cell (1mk)

…………………………………………………………………………………………………………………..

Distinguish between unicellular and multicellular organisms. (2mks)

…………………………………………………………………………………………………………………..

Identify three types of cells found in plants. (3mks)

…………………………………………………………………………………………………………………..

The figure shows a microscope
Name the parts of the microscope shown below. (4mks)

…………………………………………………………………………………………………………………..

State the functions of the parts (5mks)

…………………………………………………………………………………………………………………..

State three importance of studying biology (3mks)

…………………………………………………………………………………………………………………..

For the table below, identify the cell organelle and state the appropriate function (10mks)

CELL ORGANELLE	FUNCTION
a) Cell wall	……………………………………………………………
b) ……………………………………	Add carbohydrates to protein and transport them in the cell
c) Nucleus	…………………………………………………………
d) Nucleolus	…………………………………………………………
e) ……………………………………	Protein synthesis
f) Chloroplast	…………………………………………………………
g) ………………………………………	Contain lytic enzymes
h) Rough endoplasmic reticulum	…………………………………………………………….
i) ………………………………………	Transport lipids
j) ………………………………………	Site for respiration

Name the taxonomic units of classification in order of hierarchy (7mks)

…………………………………………………………………………………………………………………..

(a) What is the name given to the double naming of living organisms? (1mk)

…………………………………………………………………………………………………………………..

(b) The scientific name of a cat is Feliscatas.Which taxonomic group does the name Felis and catas

refer to? (2mks)

Felis

…………………………………………………………………………………………………………………..

Catas

…………………………………………………………………………………………………………………..

………………………………………………………………………………………………………………..

…………………………………………………………………………………………………………………..

*******

233

BIOLOGY

TERM 1

Form 1

TERM 1 2020

MARKING SCHEME

FORM ONE

BIOLOGY

END OF TERM 1 EXAMS

MARKING SCHEME

Bios-life

Logos-knowledge

Botany-study of plants

Zoology- study of animals

Microbiology- study of microscopic organisms (micro-organisms)

Nutrition-process by which organisms acquire and utilize nutrients;

Respiration-process by which food substances are broken down in cells to release energy;

Gaseous exchange-process by which respiratory gases (oxygen and carbon (IV) oxide) are passed across the respiratory surface;

Excretion-process by which waste or harmful materials resulting from metabolic reactions within cells of organisms are eliminated;

Growth and development-Growth is the irreversible increase in size and mass while development is the irreversible change in complexity of structure of living organisms;

Reproduction-is the process by which living things give rise to new individuals of the same kind;

Irritability-is the ability of living things to perceive changes in their surroundings and respond to them appropriately;

Movement-is the change in position by part of an organism while locomotion is where the whole organism moves or change in position

Name-sweep net;

Function-used for catching flying insects’ e.g. bees;

Name-pooter;

Function-used for sucking small animals from rock surfaces or barks of trees e.g. ants and termites;

Name-pitfall trap;

Function-used for catching small crawling animals e.g. millipedes, spiders and cockroach;

Rej-function if the name is wrong.

Rej-if name are function are interchanged.

Collect only the number of specimen needed to avoid wastage;
Not to destroy the natural habitat of the specimens.
Dangerous / injurious specimens to be handled with care as stinging insects or plants can sting or injure a person; a pair of forceps or hand gloves should be used for protection;
Do not harm/injure the specimen during the collection exercise; to avoid distorting the features of the specimen.
live specimens should be returned to their habitats whenever possible ; to maintain ecological balance
Highly mobile animals to be immobilized using suitable chemical substance tetrachloromethane or chloroform, ethoxyethane; (mark the first 4)

Hand lens;
X-convex lens ;

Y-Frame;

Z-Handle;

Used to enlarge objects (external features of collected specimens)
Magnification=;

Length of the drawing= drawing magnification X length of the object

X4 x X8cm;

=32cm;

It is the grouping of living organisms based on their structures;
-Grouping brings together living things with similar characteristics but separates those with different features;

-helps in placing living organisms in their correct group for reference;

-helps us to arrange information about living organisms in an orderly manner to avoid chaos and confusion that could arise if these were done arbitrarily;

-helps us to understand the evolutionary relationships between different organisms;

KINGDOM	REPRESENTATIVE
a) Animalia
b) Protoctista
c) Fungi
d) …………………………………..	Bacteria
e) Plantae

Rej: wrong spellings

Magnification is the ratio of an object’s image to its real size( enlargement of specimen compared to its real size); while resolution is the ability to distinguish two structures that are very close together as district entities;

Eye-piece lens	Objective lens	Total magnification
	i X20;
		ii X70
iii X50

Rej- if X (magnification) is missing.

c)1mm=1000 micrometers ()

4mm=?

4mm x 1000= 4000

1mm

Length of 1 cell =

Cell length =

Length of 1 cell=400

To allow light to pass through;
For clear visibility/ to make observations clear;
To make the cells turgid/ to avoid dehydration;

Unicellular organisms- are organisms with one cell

Multicellular organisms- are organisms with many cells;

Root hair cell

Guard cell

Palisade cell.

A -Eye piece;

C -Fine adjustment knob;

J -Stage;

D -Mirror; ( reg: wrong spellings)

B –(Coarse adjustment knob)- brings image into rough focus by raising and lowering the body tube;

E – (Diaphragm)-an aperture that regulates the amount of light passing through the condenser to illuminate the specimen;

F – (Objective lens)-contains a second set of lenses used in combination with eye-piece lenses to bring the desired magnification;

G – (Body tube) – holds the eye piece and the resolving nose piece (in position);

H – (Base)-provides firm and stable support;

Enables one to understand the development stages in human body;
Enables one to pursue careers i.e. medicine(any other relevant);
Imparts/enables one to acquire scientific skills i.e. drawing, observing, measuring, classifying, analyzing and evaluating data;
Used to solve environmental problems e.g. food shortage, pollution, drought, poor health and conservation of resources like forests, wildlife and soil;
Used to enhance/promote international co-operation in medicine, environmental conservation; (mark the 1^st three)

	CELL ORGANELLE	FUNCTION
a		-give cell a definite shape; provide mechanical support;provides protection against mechanical injury;
b	Golgi bodies(golgi apparatus);
c		Control all activities of the cell;
d		Manufacture ribosomes;
e	Ribosomes ;
f		Contain chlorophyll that traps light energy that is used during photosynrhesis;
g	Lysosomes ;
h		Transport proteins;
i	Smooth endoplasmic reticulum;
j	Mitochondria; acc motochondrion