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Form 1 Biology Nutrition in Plants Questions and Answers
Describe what happens during the light stage of photosynthesis.
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1.
State the role of light in photosynthesis.
2.
Complete the table below on mineral nutrition in plants.
3.
(a) State the role of light in the process of photosynthesis. (b) Name one end product of dark reaction in photosynthesis.
4.
State one effect of magnesium deficiency in green plants.
5.
In an experiment to investigate a factor affecting photosynthesis, a leaf of a potted plant which had been kept in the dark overnight was covered with aluminum foil as shown in the diagram below. The set up was kept in sunlight for three hours after which a food test was carried out on the leaf. (a) Which factor was being investigated in the experiment? (b) What food test was carried out?
6.
The graph below shows the effect of substrate concentration on the rate of enzyme reaction. (a) (i) account for the shape of the graph between A and B. (ii) B and C. (b) How can the rate of reaction be increased after point B? (c) State two other factors that affect the rate of enzyme reaction.
7.
Name the: (a) Material that strengthens xylem tissue. (b) Tissue that is removed when the bark of a dicotyledonous plant is ringed.
8.
Name two mineral elements that are necessary in the synthesis of chlorophyll.
9.
The diagram below represents a cell. (a) Name the parts labeled X and Y. (b) Suggest why the structures labeled X would be more on one side than the other.
10.
What is the role of the vascular bundles in plant nutrition?
11.
(a) State the functions of cristae in mitochondria. (b) The diagram below represents a cell organelle. (i) Name the part labeled Y.
12.
Name the end products of the light stage in photosynthesis.
13.
Describe what happens during the light stage of photosynthesis.
14.
The diagram below represents a set up that was used to investigate certain process in a plant. (a) State the process that was being investigated. (b) State a factor that would affect the process.
15.
How is the epidermis of a leaf of a green plant adapted to its function?
16.
Name the sites where light and dark reactions of photosynthesis take place.
17.
The equation below represents a process that takes place in plants. #6CO_2 + 6H_2O to C_6H_12O_6 + 60_2.# (a) Name the process. (b) State two conditions necessary for the process to take place. (c) State what happens to the end-products of the process.
18.
Explain how the following factors affect the rate of photosynthesis: (a) Concentration of carbon (IV) oxide. (b) Light intensity.
19.
State two ways in which chloroplasts are adapted to their function.
20.
A potted plant was kept in the dark for 48 hours. Two leaves X and Y were treated as shown in the diagram below. The experimental set-up was kept in sun light for six hours after which a starch test was carried out on the two leaves. (a) What were the results of the starch test on leaves X and Y? (b) Give reasons for your answers in (a) above.
21.
The set-up below illustrates a procedure that was carried out in the laboratory with a leaf plucked from a green plant that had been growing in sunlight. (i) What was the purpose of the above procedure? (ii) Give reasons for carrying out steps A, B and C in this procedure. (iii) Name the reagent that was used at the step labeled D. (iv) State the expected result on the leaf after adding the
22.
In an investigation, equal amounts of water was placed in three test tubes labeled G, H and J. pondweeds of equal length were dropped in each test tube. The test tubes were then placed in identical conditions of light and carbon (IV) oxide at different temperatures for five minutes. After five minutes, the bubbles produced in each were counted for one minute. The results were as shown in the table
23.
Explain the importance of the following in photosynthesis: (i) Light (ii) Carbon (IV) oxide (iii) Chlorophyll.
24.
Explain how each of the following factors affects the rates of photosynthesis. (i) Temperature. (ii) Chlorophyll concentration.
25.
In an experiment to investigate a factor affecting photosynthesis, a potted plant which had been kept in the dark overnight was treated as shown in the diagram below and exposed to light. (a) Why was the potted plant kept in the dark overnight? (b) Which factor was being investigated in the experiment? (c) (i) Which test did the students perform to confirm photosynthesis in the leaves labeled P an
26.
(a) State two factors that affect enzymatic activities. (b) Explain how one of the factors stated in (a) above affects enzymatic activities. (i) Temperature:- (ii) PH:- (iii) Enzyme concentration:- (iv) Co-enzymes:- (v) Substrate concentration:- (vi) Inhibitors:-
27.
Name the part of the chloroplast where the following reactions occur: (i) Carbon (IV) oxide fixation. (ii) Photolysis.
28.
The photograph below represents a leaf obtained from a certain plant. Account for the observation made if the leaf was tested for starch.
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