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Red Blood Cells in Transportation of Oxygen

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1.The diagram below illustrate the role played by red blood in the transportation of carbon (IV)

Oxide.

Substance F + carbon (IV) oxide

Enzyme G

Weak carbonic acid

Hydrogen ions hydrogen carbonates ions

(a) Other than carbon(IV) oxide transportation in the red blood cells, name the other form of carbon(IV) oxide transportation in humans . (1 mark)

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(b)(i) Name substance F (1 mark)

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(ii) Name the enzyme marked G and state its role in the reaction. (2 marks)

G……………………………………………………………………………………………

Role …………………………………………………………………………………………

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(d) Explain the role of calcium in blood clotting (2 marks)

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2.An experiment was carried out to investigate the rate of reaction shown below.

Sucrose Fructose + glucose.

For the products fructose and glucose to be formed, it was found that substance K was to be added and the temperature maintained at 37^oC. When another substance L was added, the reaction slowed down and eventually stopped.

(a) Suggest the identity of substance K and L (2 marks)

K …………………………………………………………………………………

L …………………………………………………………………………………

(b) Other than temperature, state three ways by which the rate of reaction would be increased

(3 marks)

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The diagram below shows an instrument used in the laboratory.

(a) Name the apparatus shown above

…………………………………………………………………………… .(1 mark)

(b) Label the parts Q , K and R (3 marks)

Q……………………………………………………

K……………………………………………………

R …………………………………………………..

P…………………………………………………………………………………

N…………………………………………………………………………………

S…………………………………………………………………………………

(d) What is the formula of calculating linear magnification (1 mark)

The diagram below shows a life cycle of a cockroach

a) Name the hormone that would be at high concentration during the first and second week and their functions.

First week (1mk)

…………………………………………………………………………

Function

………………………………………………………………………………………….

(ii) Second week (1mk)

…………………………………………………………………………

Function

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b) Name the structure that produces hormone in a (ii) above (1mk)

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c) Name the process represented by the life cycle above. (1mk)

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d) State two importance for the process named in (c) above. (2mks)

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5.Below is a diagram of nitrogen cycle. Study it and answer the questions that follows.

Name the processes represented by: A and D ( 2marks)

A ………………………………………………..

D ……………………………………………….

Name the compound represented by B (1mk)

…………………………………………………………….

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(d) (i) Identify the class of the plants to which the above cycle takes place (1mk)

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(ii) Name the part of the plant where process A takes place (1mk)

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(e) How would use of excessive pesticides affect process A (2mks)

SECTION B. (40 MARKS)

Answer question 6 (compulsory) and either question 7 or 8 in the spaces provided after question 8

Two persons X and Y drunk volumes of concentrated solution of glucose. The amount of glucose in their blood was determined at intervals. The results are shown in the table below.

Time(minutes)	Glucose level in blood(mg//100cm³)
	X	Y
0	87	84
15	112	123
30	139	170
45	116	188
60	100	208
90	95	202
120	92	144
150	88	123

(a) On the grid provided, plot graphs of glucose level in blood persons X and Y against time on the same axis. (7 marks)

(b) What was the concentration of glucose in the blood of X and Y at the 20^th minute? (2 marks)

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(c) Suggest why the glucose level in person X stopped rising after 30 minutes while it continued rising in person Y? (3 marks)

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(d) Account for the decrease in glucose level in person X after 30 minutes and person Y after 60 minutes (3 marks)

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(e) Name the compound that stores energy released during oxidation of glucose (1 mark)

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f) Explain what happens to excess amino acids (4 marks)

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Describe how the human kidney functions (20 marks)

Explain how abiotic factors affect plants (20 marks)

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Red Blood Cells in Transportation of Oxygen