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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Cell Physiology Topical Questions and Answers

9/11/2020

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CELL PHYSIOLOGY

1. 1989 Q14 P1

The table below shows the concentration of some ions in pond water and in the cell sap of an aquatic plant growing in the pond.

Ions	Concentration in pond water	Concentration in cell
Sodium	50	30
Potassium	2
Calcium	15	1
Chloride	180	200

(a)    Name the process by which the following ions could have been taken up by this plant
(i)     Sodium ions
(ii)    Potassium ions
(b)   For each processes named in (a) (i) and (ii) above, state one condition necessary for the process to take place.

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Nutrition in Plants and Animals Questions and Answers

8/11/2020

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NUTRITION IN PLANTS AND ANIMALS

The diagram below shows chemical reactions I, and II which are controlled by enzymes respectively.

1. 1989 Q1 P1

Name reaction II and enzyme B

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Introduction to Biology Questions and Answers

7/11/2020

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Introduction to Biology

1. 1995 Q 1 P1

Motor vehicles move, use energy and produce carbon dioxide and water. Similar characteristics occur in living organisms yet motor vehicles are not classified as living. List the other characteristics of living things that do NOT occur in motor vehicles.

They reproduce
They grow
They respond to stimuli

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K.C.S.E Biology Q & A - MODEL 2019PP2QN06

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP2QN06

The table below shows the rate of product formation for two enzymes, H and J over a range of pH values

(a) On the same axis, plot graphs of the rate of product formation against pH.
GRAPH PAPER
(b) Account for the rate of product formation for enzyme H between:
(i) pH 1.0 and 3.0
(ii) pH 3.0 and 7.0.
(c) From the graph, determine: .
(i) the pH value at which the rate of product formation of the two enzymes was the same
(ii) the value of the rate of product formation for enzymes H and J at the pH value stated in (c)(i) above
(iii) the optimum pH value for enzyme J
(d) State one variable that may lead to the change in the optimum rate of product-formation of the two enzymes.
(e) Suggest with a reason, the likely part of the human alimentary canal where enzyme H would be found.

answers

(b) (i) Rate of product formation increases with the increase in pH to the optimum then decreases;
   pH 5 is the optimum pH value for activity of enzyme H; between pH 1 and 2 enzyme H/enzyme molecules are activated; Between pH 2 and 3 enzyme H (enzyme molecules) are denatured/destroyed; (. Enzyme is inactivated/ less active for denatured
(ii) Rate of product formation (sharply) decreases with increase in pH; Enzyme H is (not formed by increase in pH hence is denatured); No product forms above pH 4.0 to 7.0; because all enzymes (enzyme molecules) are denatured;
(c) (i) 4.0
   (ii) 15.0 mg/hr
    (iii) 7.0
(d) -Temperature
-Substrate concentration;
-Enzyme concentration;
-Cofactors
-Co-enzymes
-(Enzyme) inhibitors
(e) Stomach;
Acidic medium/Low pH

Comments

State one importance of irritability to living organisms.

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP2QN03

State one importance of irritability to living organisms.

answers

(a) Enable living organisms to avoid dangerous/harmful/hash climatic environmental conditions; Enable living organisms obtain/access favourable environmental conditions (light, water, oxygen,

Comments

Plasmodium vivax and Plasmodiuin ovale are transmitted by a mosquito. State with a reason whether the two organisms can interbreed.

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP1QN24

Plasmodium vivax and Plasmodiuin ovale are transmitted by a mosquito. State with a reason whether the two organisms can interbreed.

answers

(a) they can interbreed; because they belong to the same genus;
They cannot interbreed; because they do not belong to the same species.

Comments

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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K.C.S.E Biology Q & A - MODEL 2019PP1QN19

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP1QN19

Below is a diagram of the human digestive system.

(a) Label with Y on the diagram where enzyme amylase is produced.
(b) Besides the digestive role, explain one other function of the part labelled H.

answers

(b) Endocrine function/secrets (insulin/ glucagon) hormones; responsible for blood sugar regulation;

Comments

Name the type of tooth in carnivores mainly used for piercing and killing of preys.

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP1QN18

Name the type of tooth in carnivores mainly used for piercing and killing of preys.

answers

canine acc. canines

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K.C.S.E Biology Q & A - MODEL 2019PP1QN11

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP1QN11

Explain each of the following physiological observations:
(a) sportsmen release little, concentrated urine at the end of a strenuous exercise
(b) a rabbit has a higher oxygen demand than a camel

answers

(a) during /after the exercise one sweat ; (profusely to cool the body/eliminate some nitrogenous (wastes) a lot of water is lost through this ; one is dehydrated ;(the little) water that is left in the body system (further) selectively reabsorbed in the kidney tubules (resulting in less but concentrated urine;)
(b) a rabbit has a higher surface area to volume ratio/ smaller in size hence has a bigger surface area exposed to heat loss to the environment/ lose heat faster/ its more active than the camel; hence need more oxygen to(aerobically) respire (to synthesize the needed energy to support its activity /lifestyle;

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K.C.S.E Biology Q & A - MODEL 2019PP1QN09

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP1QN09

Below is a photograph of Brassica oleracea, Sukuma wiki leaf.

(a)State two observable features that adapt the leaf to gaseous exchange.
(b) Explain the relationship between photosynthesis and aerobic respiration within the leaf.

answers

.(a) broad leaf blade /lamina; that expose more stomata for gaseous exchange; acc broad leaf alone
(b) photosynthesis (within the leaf in the presence of light energy) yield simple carbohydrates /glucose /sugars which form the main substrate during aerobic respiration (producing energy (ATP)
During the process of respiration carbon iv oxide produced is intern used as a raw material in photosynthesis;
During photosynthesis water is broken down yielding oxygen which is needed/ used in (cellular) (aerobic respiration);

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Distinguish between chemical and mechanical digestion.

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP1QN07

Distinguish between chemical and mechanical digestion.

answers

chemical digestion entails the action on / broken down of ingested food materials (in the alimentary canal) by the action of digestive enzymes (and converted into form that can be easily absorbed or assimilated in to the body system)while mechanical digestion refers to physical break down of(large) food molecules (into smaller form or pieces )which can subsequently be acted upon by digestive enzymes

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K.C.S.E Biology Q & A - MODEL 2019PP1QN04

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP1QN04

In investigating a certain physiological process, students set up the apparatus as shown below and made the observations after 30 minutes as illustrated.

(a) Name the physiological process being investigated.
(b) Account for the observation made at the end of the experiment.
(c) State the likely identity of G.

answers

. (a) osmosis
(b) solution E is hypertonic/ had more solute molecules compared to solution F; solution F hypotonic to solution E; by osmosis water molecules move through the semi- permeable membrane G (from solution F to E); hence decreases in volume of F/ increased solution E;
(c) semi permeable membrane /visking tubing /slice of potato /pawpaw (any other permeable plant tissue) pig bladder/cellophane paper/dialysis membranes.

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K.C.S.E Biology Q & A - MODEL 2019PP1QN03

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP1QN03

The diagram below illustrates a specialised cell obtained from a certain tissue.

(a) Name the cell.
(b) State two ways in which the cell is structurally adapted to its function.

answers

(a) nerve cell/motor neuron; acc neuron
(b) longer axon to transmit impulses/delivers action potential along way; has numerous dendrites for receiving/delivering /transmitting impulse; myelin sheath for faster transmission of impulse/insulation of axon; Schwan cell for secretion of myelin sheath; node of ranvier to enhance speed of transmission of impulse; cell body has nucleus for controlling nerve impulse transmission.

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Classification: Biology Topical Questions and Answers

Cell Physiology Topical Questions and Answers

CELL PHYSIOLOGY

1. 1989 Q14 P1

Nutrition in Plants and Animals Questions and Answers

NUTRITION IN PLANTS AND ANIMALS

The diagram below shows chemical reactions I, and II which are controlled by enzymes respectively.

Introduction to Biology Questions and Answers

Introduction to Biology

Motor vehicles move, use energy and produce carbon dioxide and water. Similar characteristics occur in living organisms yet motor vehicles are not classified as living. List the other characteristics of living things that do NOT occur in motor vehicles.

K.C.S.E Biology Q & A - MODEL 2019PP2QN06

K.C.S.E Biology Q & A - MODEL 2019PP2QN06

State one importance of irritability to living organisms.

State one importance of irritability to living organisms.

Plasmodium vivax and Plasmodiuin ovale are transmitted by a mosquito. State with a reason whether the two organisms can interbreed.

Plasmodium vivax and Plasmodiuin ovale are transmitted by a mosquito. State with a reason whether the two organisms can interbreed.

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

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

K.C.S.E Biology Q & A - MODEL 2019PP1QN19

K.C.S.E Biology Q & A - MODEL 2019PP1QN19

Name the type of tooth in carnivores mainly used for piercing and killing of preys.

Name the type of tooth in carnivores mainly used for piercing and killing of preys.

K.C.S.E Biology Q & A - MODEL 2019PP1QN11

K.C.S.E Biology Q & A - MODEL 2019PP1QN11

K.C.S.E Biology Q & A - MODEL 2019PP1QN09

K.C.S.E Biology Q & A - MODEL 2019PP1QN09

Distinguish between chemical and mechanical digestion.

Distinguish between chemical and mechanical digestion.

K.C.S.E Biology Q & A - MODEL 2019PP1QN04

K.C.S.E Biology Q & A - MODEL 2019PP1QN04

K.C.S.E Biology Q & A - MODEL 2019PP1QN03

K.C.S.E Biology Q & A - MODEL 2019PP1QN03

TOPICS

Form 2

Form 3

Form 4

Archives

Categories

Send Us a Message

CELL PHYSIOLOGY

1. 1989 Q14 P1

NUTRITION IN PLANTS AND ANIMALS

​The diagram below shows chemical reactions I, and II which are controlled by enzymes respectively.

​Introduction to Biology

​Motor vehicles move, use energy and produce carbon dioxide and water. Similar characteristics occur in living organisms yet motor vehicles are not classified as living. List the other characteristics of living things that do NOT occur in motor vehicles.

K.C.S.E Biology Q & A - MODEL 2019PP2QN06

State one importance of irritability to living organisms.

Plasmodium vivax and Plasmodiuin ovale are transmitted by a mosquito. State with a reason whether the two organisms can interbreed.

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

K.C.S.E Biology Q & A - MODEL 2019PP1QN19

Name the type of tooth in carnivores mainly used for piercing and killing of preys.

K.C.S.E Biology Q & A - MODEL 2019PP1QN11

K.C.S.E Biology Q & A - MODEL 2019PP1QN09

Distinguish between chemical and mechanical digestion.

K.C.S.E Biology Q & A - MODEL 2019PP1QN04

K.C.S.E Biology Q & A - MODEL 2019PP1QN03

TOPICS

Form 2

Form 3

Form 4

Archives

Categories

Send Us a Message

The diagram below shows chemical reactions I, and II which are controlled by enzymes respectively.

Introduction to Biology

Motor vehicles move, use energy and produce carbon dioxide and water. Similar characteristics occur in living organisms yet motor vehicles are not classified as living. List the other characteristics of living things that do NOT occur in motor vehicles.