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-Moist epitehelium to dissolve respiratory gases;
-Dense capillary network/vasulatical to facilitate transport of respiratory gases
-Thin epithelium for faster diffusion/to reduce diffusion distance/large S.A to maximize on glexochage .
johnson mwenjera answered the question on December 24, 2017 at 12:09
- Name two gaseous exchange surfaces in plants stomata(Solved)
Name two gaseous exchange surfaces in plants stomata.
Date posted: December 24, 2017. Answers (1)
- The cells of a certain herbaceous plant were found to have a diameter of 25µm. The cells were placed in varying concentrations of sugar solution....(Solved)
The cells of a certain herbaceous plant were found to have a diameter of 25µm. The cells were placed in varying concentrations of sugar solution. The average diameter of the cells in each solution was determined and the results obtained were as shown in the table below.
Concentration of sugar solution (%)---Diameter of cells (µm)
1----50
5----40
10----30
15----20
a)From the results determine the concentration of the cell sap.
b)Give an explanation for the average diameter of the cells placed in 15%
c) Name the process that occurred in the cells which were placed in 1% sugar solution.
Date posted: December 24, 2017. Answers (1)
- State two functions played by the cell wall in plant cells and give the adaptation of the cell wall to performing each of the stated...(Solved)
State two functions played by the cell wall in plant cells and give the adaptation of the cell wall to performing each of the stated functions.
Date posted: December 24, 2017. Answers (1)
- Define resolving power of a microscope. (Solved)
Define resolving power of a microscope.
Date posted: December 24, 2017. Answers (1)
- State three reasons that necessitate classification of living organisms by taxonomists.(Solved)
State three reasons that necessitate classification of living organisms by taxonomists.
Date posted: December 24, 2017. Answers (1)
- Define the following branches of Biology. (i) Genetics (ii) Entomology(Solved)
Define the following branches of Biology.
(i) Genetics
(ii) Entomology
Date posted: December 24, 2017. Answers (1)
- A climbing plant twines around the stem of a tall tree.
(i) Name the type of response exhibited by the climbing stem.
ii) Explain how the...(Solved)
A climbing plant twines around the stem of a tall tree.
(i) Name the type of response exhibited by the climbing stem.
ii) Explain how the response named in (a) (i) above takes place.
Date posted: December 24, 2017. Answers (1)
- An experiment was carried out to investigate the response of white termites to a certain stimulus. Ten termite were placed at the centre of glass...(Solved)
An experiment was carried out to investigate the response of white termites to a certain stimulus. Ten termite were placed at the centre of glass tubing. Calcium chloride was placed one end of the tubing and moist cotton wool at the other end.
(a)What observations are made after 20 minutes?
(b)What type of response is exhibited by the termites?
(c)What is the survival value of the above response?
(d)What is Photonasty?
Date posted: December 24, 2017. Answers (1)
- What is multiple allelism? (Solved)
What is multiple allelism?
Date posted: December 24, 2017. Answers (1)
- A pure breeding black male mouse was mated with a pure breeding brown female mouse. All the offspring had black coat colour.
Explain the appearance of...(Solved)
A pure breeding black male mouse was mated with a pure breeding brown female mouse. All the offspring had black coat colour.
Explain the appearance of black coat colour in the offspring.
Date posted: December 24, 2017. Answers (1)
- Why do human temperature falls during bath?(Solved)
Why do human temperature falls during bath?
Date posted: December 23, 2017. Answers (1)
- State two disorders in human beings that are as a result of chromosomal mutation.(Solved)
State two disorders in human beings that are as a result of chromosomal mutation.
Date posted: December 23, 2017. Answers (1)
- (i) What is eutrophication?
(ii) What are the effects of eutrophication? (Solved)
(i) What is eutrophication?
(ii) What are the effects of eutrophication?
Date posted: December 23, 2017. Answers (1)
- (a)What is meant by the term biological control? (b) Give an example of biological control (Solved)
(a)What is meant by the term biological control?
(b) Give an example of biological control
Date posted: December 23, 2017. Answers (1)
- Describe the structure and functions of various organelles in a mature animal cell. (Solved)
Describe the structure and functions of various organelles in a mature animal cell.
Date posted: December 23, 2017. Answers (1)
- Why are some enzymes produced in their precursor form?(Solved)
Why are some enzymes produced in their precursor form?
Date posted: December 23, 2017. Answers (1)
- Why is the palisade layer a tissue?(Solved)
Why is the palisade layer a tissue?
Date posted: December 22, 2017. Answers (1)
- Differentiate between holometabolous and hemimetabolous in insects.(Solved)
Differenriate between holometabolous and hemimetabolous
Date posted: December 18, 2017. Answers (1)
- Who is the father of genetics and inheritance in biology?(Solved)
Who is the father of genetics and inheritance in biology?
Date posted: December 18, 2017. Answers (1)
- Which component of the diet assists in peristalsis?(Solved)
Which component of the diet assists in peristalsis?
Date posted: December 13, 2017. Answers (1)