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1.   State the function of the organelles: (a) Lysosomes (b) Golgi apparatus (Answered)
State the function of the organelles: (a) Lysosomes (b) Golgi apparatus .
Posted On:Sat 3, April 2021 18:49:15 pm
2.   Name the organelle in which protein synthesis takes place. (Answered)
Name the organelle in which protein synthesis takes place. .
Posted On:Sat 3, April 2021 18:48:10 pm
3.   Which organelle would be abundant in: (a) Skeletal muscle cell (b) Palisade cell (Answered)
Which organelle would be abundant in: (a) Skeletal muscle cell (b) Palisade cell .
Posted On:Sat 3, April 2021 18:47:32 pm
4.   State the functions of the following cell organelles (a) Golgi apparatus (b) Ribosomes (Answered)
State the functions of the following cell organelles (a) Golgi apparatus (b) Ribosomes .
Posted On:Sat 3, April 2021 18:46:25 pm
5.   State two functions of cell sap. (Answered)
State two functions of cell sap. .
Posted On:Sat 3, April 2021 18:44:34 pm
6.   Name the organelle that performs each of the following functions in a cell. i)Protein Synthesis ii)Transport of cell secretions (Answered)
Name the organelle that performs each of the following functions in a cell. i)Protein Synthesis ii)Transport of cell secretions .
Posted On:Sat 3, April 2021 18:43:47 pm
7.   The wavelength of a radio wave is 1km. Determine its frequency. (Take the speed of light as #3.0 times 10^8 ms^-1#) (Answered)
The wavelength of a radio wave is 1km. Determine its frequency. (Take the speed of light as #3.0 times 10^8 ms^-1#) .
Posted On:Sat 3, April 2021 18:38:59 pm
8.   Figure 2 shows how the displacement varies with time for a certain wave. Determine the frequency of the wave. (Answered)
Figure 2 shows how the displacement varies with time for a certain wave. Determine the frequency of the wave. .
Posted On:Sat 3, April 2021 18:32:21 pm
9.   Figure 4 shows a hack- saw blade clamped horizontally on a bench and the free end is made to vibrate about the rest position. The movement 0→a→0→b→0→a→0→b, takes 0.7 seconds. Determine the frequency of the vibration of the blade (Answered)
Figure 4 shows a hack- saw blade clamped horizontally on a bench and the free end is made to vibrate about the rest position. The movement 0→a→0→b→0→a→0→b, takes 0.7 seconds. Determine the frequency of the vibration of the blade .
Posted On:Sat 3, April 2021 18:28:50 pm
10.   Figure 10 represents a transverse wave of frequency 5 Hz travelling in the x direction. Determine the speed of the wave. (Answered)
Figure 10 represents a transverse wave of frequency 5 Hz travelling in the x direction. Determine the speed of the wave. .
Posted On:Sat 3, April 2021 18:19:06 pm
11.   Figure 5 shows the displacement time graph of a wave travelling at 200cm/s. Determine for the wave, the (i) Amplitude (ii) Period (iii) Frequency (iv) Wavelength (Answered)
Figure 5 shows the displacement time graph of a wave travelling at 200cm/s. Determine for the wave, the (i) Amplitude (ii) Period (iii) Frequency (iv) Wavelength .
Posted On:Sat 3, April 2021 18:09:43 pm
12.   State one difference between mechanical and electromagnetic waves. (Answered)
State one difference between mechanical and electromagnetic waves. .
Posted On:Sat 3, April 2021 18:04:05 pm
13.   The audible frequency range for a certain person is 30Hz and 16500 Hz. Determine the largest wavelength of sound in air the person can detect. (speed of sound in air=330m/s) (Answered)
The audible frequency range for a certain person is 30Hz and 16500 Hz. Determine the largest wavelength of sound in air the person can detect. (speed of sound in air=330m/s) .
Posted On:Sat 3, April 2021 18:00:42 pm
14.   Give one example of a longitudinal wave. (Answered)
Give one example of a longitudinal wave. .
Posted On:Sat 3, April 2021 17:59:01 pm
15.   Figure 2 represents a displacement-time graph for a wave. (i) Determine the frequency of the wave. (Answered)
Figure 2 represents a displacement-time graph for a wave. (i) Determine the frequency of the wave. .
Posted On:Sat 3, April 2021 17:57:29 pm
16.   Water waves are observed as they pass a fixed point at a rate of 30 crests per minute. A particular wave crest takes 2s to travel between two fixed points 6m apart. Determine for the wave: (i) The frequency (ii) The wavelength (Answered)
Water waves are observed as they pass a fixed point at a rate of 30 crests per minute. A particular wave crest takes 2s to travel between two fixed points 6m apart. Determine for the wave: (i) The frequency (ii) The wavelength .
Posted On:Sat 3, April 2021 17:51:55 pm
17.   Give one example of a transverse wave and one example of longitudinal wave (Answered)
Give one example of a transverse wave and one example of longitudinal wave .
Posted On:Sat 3, April 2021 17:48:40 pm
18.   Calculate the wavelength of the KCB FM radio wave transmitted at a frequency of 95.6 Mega Hertz. (Answered)
Calculate the wavelength of the KCB FM radio wave transmitted at a frequency of 95.6 Mega Hertz. .
Posted On:Sat 3, April 2021 17:44:53 pm
19.   State two distinctions between the way sound waves and electromagnetic waves are transmitted (Answered)
State two distinctions between the way sound waves and electromagnetic waves are transmitted .
Posted On:Sat 3, April 2021 17:39:30 pm
20.   What is the difference between longitudinal and transverse waves? (Answered)
What is the difference between longitudinal and transverse waves? .
Posted On:Sat 3, April 2021 17:38:49 pm
21.   The photograph below represents a leaf obtained from a certain plant. Account for the observation made if the leaf was tested for starch. (Answered)
The photograph below represents a leaf obtained from a certain plant. Account for the observation made if the leaf was tested for starch. .
Posted On:Sat 3, April 2021 17:36:43 pm
22.   Name the part of the chloroplast where the following reactions occur: (i) Carbon (IV) oxide fixation. (ii) Photolysis. (Answered)
Name the part of the chloroplast where the following reactions occur: (i) Carbon (IV) oxide fixation. (ii) Photolysis. .
Posted On:Sat 3, April 2021 17:34:07 pm
23.   State two factors that affect enzymatic activities (Answered)
State two factors that affect enzymatic activities .
Posted On:Sat 3, April 2021 17:32:02 pm
24.   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? (Answered)
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? .
Posted On:Sat 3, April 2021 17:30:46 pm
25.   Explain how each of the following factors affects the rates of photosynthesis. (i) Temperature. (ii) Chlorophyll concentration. (Answered)
Explain how each of the following factors affects the rates of photosynthesis. (i) Temperature. (ii) Chlorophyll concentration. .
Posted On:Sat 3, April 2021 17:25:59 pm
26.   Explain the importance of the following in photosynthesis: (i) Light (ii) Carbon (IV) oxide (iii) Chlorophyll. (Answered)
Explain the importance of the following in photosynthesis: (i) Light (ii) Carbon (IV) oxide (iii) Chlorophyll. .
Posted On:Sat 3, April 2021 16:51:28 pm
27.   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 (Answered)
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 .
Posted On:Sat 3, April 2021 16:48:06 pm
28.   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 (Answered)
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 .
Posted On:Sat 3, April 2021 16:42:54 pm
29.   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. (Answered)
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. .
Posted On:Sat 3, April 2021 16:34:53 pm
30.   State two ways in which chloroplasts are adapted to their function. (Answered)
State two ways in which chloroplasts are adapted to their function. .
Posted On:Sat 3, April 2021 16:30:20 pm
31.   Explain how the following factors affect the rate of photosynthesis: (a) Concentration of carbon (IV) oxide. (b) Light intensity. (Answered)
Explain how the following factors affect the rate of photosynthesis: (a) Concentration of carbon (IV) oxide. (b) Light intensity. .
Posted On:Sat 3, April 2021 16:29:25 pm
32.   The equation below represents a process that takes place in plants. #6CO_2+6H_2O rightarrow C_6H_12O_6+6O_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. (Answered)
The equation below represents a process that takes place in plants. #6CO_2+6H_2O rightarrow C_6H_12O_6+6O_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. .
Posted On:Sat 3, April 2021 16:27:48 pm
33.   Name the sites where light and dark reactions of photosynthesis take place. (Answered)
Name the sites where light and dark reactions of photosynthesis take place. .
Posted On:Sat 3, April 2021 16:21:56 pm
34.   How is the epidermis of a leaf of a green plant adapted to its function? (Answered)
How is the epidermis of a leaf of a green plant adapted to its function? .
Posted On:Sat 3, April 2021 16:20:58 pm
35.   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. (Answered)
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. .
Posted On:Sat 3, April 2021 16:19:02 pm
36.   (a) State two factors that affect enzymatic activities (b) Explain how one of the factors stated in (a) above affects enzymatic activities. (Answered)
(a) State two factors that affect enzymatic activities (b) Explain how one of the factors stated in (a) above affects enzymatic activities. .
Posted On:Sat 3, April 2021 16:10:43 pm
37.   State two factors that affect enzymatic activities (Answered)
State two factors that affect enzymatic activities .
Posted On:Sat 3, April 2021 16:08:57 pm
38.   Describe what happens during the light stage of photosynthesis. (Answered)
Describe what happens during the light stage of photosynthesis. .
Posted On:Sat 3, April 2021 16:07:39 pm
39.   Name the end products of the light stage in photosynthesis. (Answered)
Name the end products of the light stage in photosynthesis. .
Posted On:Sat 3, April 2021 16:06:56 pm
40.   The diagram below represents a cell organelle. (i) Name the part labeled Y. (ii) State the functions of the part labeled X. (Answered)
The diagram below represents a cell organelle. (i) Name the part labeled Y. (ii) State the functions of the part labeled X. .
Posted On:Sat 3, April 2021 15:47:47 pm
41.   State the functions of cristae in mitochondria (Answered)
State the functions of cristae in mitochondria .
Posted On:Sat 3, April 2021 15:45:22 pm
42.   What is the role of the vascular bundles in plant nutrition? (Answered)
What is the role of the vascular bundles in plant nutrition? .
Posted On:Sat 3, April 2021 15:42:59 pm
43.   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. (Answered)
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. .
Posted On:Sat 3, April 2021 15:40:04 pm
44.   Name two mineral elements that are necessary in the synthesis of chlorophyll. (Answered)
Name two mineral elements that are necessary in the synthesis of chlorophyll. .
Posted On:Sat 3, April 2021 15:37:54 pm
45.   Name the: (a) Material that strengthens xylem tissue. (b) Tissue that is removed when the bark of a dicotyledonous plant is ringed. (Answered)
Name the: (a) Material that strengthens xylem tissue. (b) Tissue that is removed when the bark of a dicotyledonous plant is ringed. .
Posted On:Sat 3, April 2021 15:37:25 pm
46.   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. (Answered)
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. .
Posted On:Sat 3, April 2021 15:34:55 pm
47.   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? (Answered)
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? .
Posted On:Sat 3, April 2021 15:30:44 pm
48.   State one effect of magnesium deficiency in green plants. (Answered)
State one effect of magnesium deficiency in green plants. .
Posted On:Sat 3, April 2021 15:26:34 pm
49.   Name one end product of dark reaction in photosynthesis (Answered)
Name one end product of dark reaction in photosynthesis .
Posted On:Sat 3, April 2021 15:26:03 pm
50.   Complete the table below on mineral nutrition in plants. (Answered)
Complete the table below on mineral nutrition in plants. .
Posted On:Sat 3, April 2021 15:25:10 pm
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