KNEC KCSE BIOLOGY TOPICAL QUESTIONS

The graph below is of sewage on the population of a species of bacteria in a certain river

11/9/2021

Comments

The graph below is of sewage on the population of a species of bacteria in a certain river

The graph ABOVE is of sewage on the population of a species of bacteria in a certain river

(a) Account for the charges in population of bacteria between 2 and 10 kilometers down the river (2mks)

Between 2km and 6km, the number of bacteria increases because of plenty of food.
Between 6km to 8km, the number of bacteria decreases and after 8km, the number of bacteria remains constant

Distinguish between interspecific and intra-specific competition (2mks)

Interspecific competition-is the competition between organisms of the same species
Intraspecific competition is competition between organisms of different species

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State the characteristics that distinguish the following organisms into their respective classes

9/9/2021

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State the characteristics that distinguish the following organisms into their respective classes (3mks)

Millipedes, spider and tsetse fly

Millipedes have two pairs of legs per segment
Tsetse fly has wings
Spider has a cephalothorax

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Classification: Biology Topical Questions and Answers

11/11/2020

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CLASSIFICATION

1. 1995 Q3 P1

State two ways in which some fungi are harmful to man (2 marks)

2. 1995 Q6 P1

The diagram below represents a fern

fern

Name

(a) The parts labelled A and B ( 2 marks)

(b) The division to which the plant belongs ( 1 mark)

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Make a diagram of a simple, bibbed leaf with a serrated margin.

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP1QN21

Make a diagram of a simple, bibbed leaf with a serrated margin.

answers

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Explain why the bat is classified as a mammal yet it flies.

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP1QN02

Explain why the bat is classified as a mammal yet it flies.

answers

has mammary gland; body covered with fur/hair; gives birth/does not lay eggs; has external ears/pinnae; has seven cervical vertebrae; has sweat glands; heterodonts/four types of teeth

Comments

Besides venation, state two other external characteristics of leaves that can be used to classify plants.

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP1QN02

Besides venation, state two other external characteristics of leaves that can be used to classify plants.

answers

(a) shape of the leaf blade/lamina(broadness or narrowness); leaf margin(smooth or serrated); leaf apex(pinnate dot rounded);leaf arrangement; leaf colour ; (leaf texture(smooth or rough); leaf type(simple or compound)leaf sheath/petiole(absence or presence)
(b) has mammary gland; body covered with fur/hair; gives birth/does not lay eggs; has external ears/pinnae; has seven cervical vertebrae; has sweat glands; heterodonts/four types of teeth

Comments

K.C.S.E Biology Q & A - MODEL 2019PP1QN01

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP1QN01

Name the characteristic of living organisms illustrated by each of the activities described below:
(a) Dressing heavily
(b) Bursting of the sporangium in the Rhizopus sp

answers

Comments

K.C.S.E Biology Q & A - MODEL 2018PP2QN05

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2018PP2QN05

The photograph below represents a plant in a Certain Division

(a) (i) Name the Division to which the plant belongs.
(ii) With reference to the Photograph, state three observable features of the Division named in a(i) above.
(b) Name the part labelled N and P.
N
P
(c) Explain how the part labelled Q is adapted to its function

answers

a) i. Bryophyta;
ii. Has capsules (for enclosing spores);
Has (long) setae (for supporting the capsules/for effective propagation of spores); (Developed) rhizoids (for anchorage/absorption of water/mineral salts);
Thalloid in nature/Thallus/undifferentiated;
b) N — Capsule;
P—Seta;
(c)Numerous/hair-like to increase the surface area for absorption;/to enhance rate of absorption of water/nutrients/dissolved mineral salts;
Numerous/hair-like to hold firmly on the surface/not to be easily blown away/displaced/anchorage;

Comments

State two observable features that place a millipede into its Class.

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2018PP1QN02

State two observable features that place a millipede into its Class.

answers

Cylindrical body;
9-100 segments;
Each segment has two pairs of legs;
Pair of short antennae;
Has two clumps of many simple eyes;
Has anterior genital pore/apparatus;
Has three body parts (head., thorax and trunk);

Comments

State three characteristics of the class Crustacea.

30/6/2020

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K.C.S.E Biology Q & A - MODEL 2016PP1QN22

State three characteristics of the class Crustacea.

answers

Fused head and thorax/ capholothorax (often) protected by carapace.
Gaseous exchange through gills
Two pairs of antennae
Five more pairs of limbs/ five to twenty pairs of limbs; rej five
A pair of compound eyes
Three pairs of mouth parts (consisting of labial pulps /maxillae/mandible)

Comments

State the important of tactic response among some members of the kingdom protista.

30/6/2020

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K.C.S.E Biology Q & A - MODEL 2016PP1QN03

State the important of tactic response among some members of the kingdom protista.

answer

Move towards favorable environment; accept converse

Comments

State four structural differences between millipedes and centipedes.

29/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2015PP1QN16

State four structural differences between millipedes and centipedes.

answers

Millipedes Centipedes
Cylindrical body Dorso - ventrally flattened
Head has two clumps of many simple eyes Head has a pair of simple eyes
Each segment has two pairs of walking Each segment has a pair of waking legs
legs (except the first thoracic segment)
Head has a pair of short antennae; Head has a pair of long antennae.
No poison claws Has poison claws
Three body parts - head short, throrax, Two body parts - head and trunk
and trunk
Has anterior genital aperture Has aposterior genital aperture
Has 9 - 100 segments Has 15 - 21 segments

Comments

How is the low power objective lens manipulated to focus a specimen for observation under a light microscope?

29/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2015PP1QN05

How is the low power objective lens manipulated to focus a specimen for observation under a light microscope?

answers

Click the low power objective lens into position. Bring it down to the lowest level using the coarse adjustment knob;
With eyes on the eyepiece lenses and using the coarse adjustment knob gradually raise lower the low power objective lens to bring the specimen into focus;

Comments

State two advantages of using a coverslip when preparing a specimen for observation under a light microscope.

29/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2015PP1QN05

State two advantages of using a coverslip when preparing a specimen for observation under a light microscope.

answers

(i) To hold the specimen in place;
(ii) Protects specimen from dehydration/drying up/dust particles;
(iii)Protect objective lens from staining.

Comments

State two guidelines that should be followed when typing scientific names.

29/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2015PP1QN01

State two guidelines that should be followed when typing scientific names.

answers

The Genus name starts with a capital letter while the species name starts with a small letter;
The two names are typed in italics/two names underlined separately;

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<<Previous

The graph below is of sewage on the population of a species of bacteria in a certain river

(a) Account for the charges in population of bacteria between 2 and 10 kilometers down the river (2mks)

Distinguish between interspecific and intra-specific competition (2mks)

State the characteristics that distinguish the following organisms into their respective classes

Classification: Biology Topical Questions and Answers

Make a diagram of a simple, bibbed leaf with a serrated margin.

Make a diagram of a simple, bibbed leaf with a serrated margin.

Explain why the bat is classified as a mammal yet it flies.

Explain why the bat is classified as a mammal yet it flies.

Besides venation, state two other external characteristics of leaves that can be used to classify plants.

Besides venation, state two other external characteristics of leaves that can be used to classify plants.

K.C.S.E Biology Q & A - MODEL 2019PP1QN01

K.C.S.E Biology Q & A - MODEL 2019PP1QN01

K.C.S.E Biology Q & A - MODEL 2018PP2QN05

K.C.S.E Biology Q & A - MODEL 2018PP2QN05

State two observable features that place a millipede into its Class.

State two observable features that place a millipede into its Class.

State three characteristics of the class Crustacea.

State three characteristics of the class Crustacea.

State the important of tactic response among some members of the kingdom protista.

State the important of tactic response among some members of the kingdom protista.

State four structural differences between millipedes and centipedes.

State four structural differences between millipedes and centipedes.

How is the low power objective lens manipulated to focus a specimen for observation under a light microscope?

How is the low power objective lens manipulated to focus a specimen for observation under a light microscope?

State two advantages of using a coverslip when preparing a specimen for observation under a light microscope.

State two advantages of using a coverslip when preparing a specimen for observation under a light microscope.

State two guidelines that should be followed when typing scientific names.

State two guidelines that should be followed when typing scientific names.

TOPICS

Form 2

Form 3

Form 4

Archives

Categories

​(a) Account for the charges in population of bacteria between 2 and 10 kilometers down the river (2mks)

​Distinguish between interspecific and intra-specific competition (2mks)

Make a diagram of a simple, bibbed leaf with a serrated margin.

Explain why the bat is classified as a mammal yet it flies.

Besides venation, state two other external characteristics of leaves that can be used to classify plants.

K.C.S.E Biology Q & A - MODEL 2019PP1QN01

K.C.S.E Biology Q & A - MODEL 2018PP2QN05

State two observable features that place a millipede into its Class.

State three characteristics of the class Crustacea.

State the important of tactic response among some members of the kingdom protista.

State four structural differences between millipedes and centipedes.

How is the low power objective lens manipulated to focus a specimen for observation under a light microscope?

State two advantages of using a coverslip when preparing a specimen for observation under a light microscope.

State two guidelines that should be followed when typing scientific names.

TOPICS

Form 2

Form 3

Form 4

Archives

Categories

(a) Account for the charges in population of bacteria between 2 and 10 kilometers down the river (2mks)

Distinguish between interspecific and intra-specific competition (2mks)