a) Diffusion
b) Inside - colour turns blue-black
c) Inside - Iodine molecules diffused across the visking tubing (outside - banana molecules are large hence couldn't pass through visking tubing)
sharon kalunda answered the question on May 27, 2019 at 08:04
-
Describe one method that can be used to measure the average growth rate of a single leaf.
(Solved)
Describe one method that can be used to measure the average growth rate of a single leaf.
Date posted:
May 27, 2019
.
Answers (1)
-
Why is excretion of nitrogenous wastes more of a problem to animals than plants.
(Solved)
Why is excretion of nitrogenous wastes more of a problem to animals than plants.
Date posted:
May 27, 2019
.
Answers (1)
-
Give two possible ways of establishing the genotype of an organism whose genotype is unknown.
(Solved)
Give two possible ways of establishing the genotype of an organism whose genotype is unknown.
Date posted:
May 27, 2019
.
Answers (1)
-
Two potted plants A and B were placed in the dark for two days. Each was then placed in an air tight bell jar as...
(Solved)
Two potted plants A and B were placed in the dark for two days. Each was then placed in an air tight bell jar as follows then transferred to light for four hours. Each plant was then tested for starch.
a) why were the plants put in the dark place for two days.
b) what was the result of the starch test in plant B.Expain your answer.
Date posted:
May 27, 2019
.
Answers (1)
-
Name the polysaccharides found in the following structures.
a) Exoskeleton
b) Xylem vessels
(Solved)
Name the polysaccharides found in the following structures.
a) Exoskeleton
b) Xylem vessels
Date posted:
May 27, 2019
.
Answers (1)
-
Name two enzymes and one ion metal that are needed in the blood clotting process.
(Solved)
Name two enzymes and one ion metal that are needed in the blood clotting process.
Date posted:
May 27, 2019
.
Answers (1)
-
A certain animal has no incisor, no canines, 6 premolars and 6 molar in its upper jaw. In the lower jaw there are 6 incisors,...
(Solved)
A certain animal has no incisor, no canines, 6 premolars and 6 molar in its upper jaw. In the lower jaw there are 6 incisors, 2 canines, 6 premolars and 6 molars. Write its dental formula
Date posted:
May 27, 2019
.
Answers (1)
-
Name the organelles that would be most likely found in large numbers in cells that perform the functions below.
a) A cell in the ileum that...
(Solved)
Name the organelles that would be most likely found in large numbers in cells that perform the functions below.
a) A cell in the ileum that actively takes in glucose
b) A cell in the liver that breaks down foreign bodies
Date posted:
May 24, 2019
.
Answers (1)
-
An experiment was carried out to investigate haemolysis of human red blood cells. The red blood cells were placed in different concentration of sodium chloride...
(Solved)
An experiment was carried out to investigate haemolysis of human red blood cells. The red blood cells were placed in different concentration of sodium chloride solution. The percentage of haemolysed cells was determined. The results were as shown in the table below.
a) i) On the grid provided, plot a graph of haemolysed red blood cells against salt concentration.
ii)At what concentration of salt solution was the proportion of haemolysed cell equal to non-haemolysed cells?
iii) State the percentage of cells haemolysed at salt concentration of 0.45%.
b) Account for the results obtained at:
i) 0.33 percent salt concentration.
ii) 0.48 per cent salt concentration.
c) What would happen to the red blood cells if they were placed in 0.50 percent salt solution?
d) Explain what would happen to onion epidermal cells if they were placed in distilled water.
Date posted:
May 24, 2019
.
Answers (1)
-
The diagram below represents a food web in a certain ecosystem.
a) Name the trophic level occupied by each of the following:
i) Caterpillar .
ii) Small...
(Solved)
The diagram below represents a food web in a certain ecosystem.
a) Name the trophic level occupied by each of the following:
i) Caterpillar .
ii) Small insects .
b) From the food web, construct two food chains which end with lizards as tertiary consumer.
c) i) Which organisms have the least biomass in this ecosystem?
ii) Explain the answer in c(i) above.
Date posted:
May 24, 2019
.
Answers (1)
-
State the structural modification of nephron in the desert mammals.
(Solved)
State the structural modification of nephron in the desert mammals.
Date posted:
May 24, 2019
.
Answers (1)
-
An experiment was carried out to find out the concentrations of ions in the cell sap of an aquatic plant and that of the water...
(Solved)
An experiment was carried out to find out the concentrations of ions in the cell sap of an aquatic plant and that of the water in the pond in which they grew.
a) i) Name the process by which the aquatic plant absorbs ions from the pond water.
ii) Outline four roles of the process you have named in (a) (i) above in a mammalian body.
b) How can the rate of uptake of ions by aquatic plants be increased.
c) Name the part of the cell that allows passage of ions in and out of the cell.
Date posted:
May 24, 2019
.
Answers (1)
-
When pure breeding red flowered plants were crossed with pure breeding white flowered plant, the offspring were all pink
flowered.
a) Using letter R to represent the...
(Solved)
When pure breeding red flowered plants were crossed with pure breeding white flowered plant, the offspring were all pink
flowered.
a) Using letter R to represent the gene for red coloured flower plants and W for the gene for the white flowered plants.
Workout the genotypic ratio of F2 generation.
b) State the phenotypic ratio of F2 generation.
c) i) What is the name given to a condition when two alleles in heterozygon state contribute equally to the phenotype of an
organizations.
ii) Give an example of a trait in human beings where the above condition in c(i) above express itself.
Date posted:
May 24, 2019
.
Answers (1)
-
How is a sugarcane flower adapted to wind pollination?
(Solved)
How is a sugarcane flower adapted to wind pollination?
Date posted:
May 24, 2019
.
Answers (1)
-
Differentiate between photosynthesis and respiration.
(Solved)
Differentiate between photosynthesis and respiration.
Date posted:
May 24, 2019
.
Answers (1)
-
In an experiment, a black mouse was mated with a brown mouse. All the offsprings in F1 generated were black. The offspring grew and were...
(Solved)
In an experiment, a black mouse was mated with a brown mouse. All the offsprings in F1 generated were black. The offspring grew and were all allowed to mate with one another. The total number of F2 generation offspring were 96.
(a) Using letter B to denote the gene for black colour, work out the genotype of the F1 generation.(Use a punnet square)
(b) State the following for the F2 generation.
(i) Genotypic ratio.
(ii) Phenotypic ratio
(iii) The total number of brown mice.
Date posted:
May 24, 2019
.
Answers (1)
-
The following diagram is a longitudinal section of the root apex.
Identify the parts labeled A, B and C.
(Solved)
The following diagram is a longitudinal section of the root apex.
Identify the parts labeled A, B and C.
Date posted:
May 24, 2019
.
Answers (1)
-
The graph below represents the growth in a certain phylum.
(a) Name the type of growth pattern shown on the graph.
(b) Identify the process represented...
(Solved)
The graph below represents the growth in a certain phylum.
(a) Name the type of growth pattern shown on the graph.
(b) Identify the process represented by X.
(c) Name the hormone responsible for the process in (b) above.
Date posted:
May 24, 2019
.
Answers (1)
-
What characteristics do mammalian lungs and the gills of bony fish have in common that enables them to exchange gases efficiently?
(Solved)
What characteristics do mammalian lungs and the gills of bony fish have in common that enables them to exchange gases efficiently?
Date posted:
May 24, 2019
.
Answers (1)
-
State two adaptation of herbivorous which enable them to digest cellulose?
(Solved)
State two adaptation of herbivorous which enable them to digest cellulose?
Date posted:
May 24, 2019
.
Answers (1)