-Migration - Individuals in a population may move from one place to another and these movements may change
the size of populations;
-Infant mortality - the higher the infant mortality the lower the population growthrate ;
-Natural enemies - Presence of natural enemies such as predators and pathogens reduced population growth rate
and vice versa ;
- Sex ratio ; This is the ratio of females to males in a population. The more the females the greater the
population growth rate ;
- Fertility - This is the number of offspring each organism give rise to during its life span. The higher the
fertility rate the greater the population growth rate ;
sharon kalunda answered the question on May 24, 2019 at 10:28
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The figure below shows a section through a leaf. A leaf is designed for photosynthesis and this process provides a supply of simple sugars for...
(Solved)
The figure below shows a section through a leaf. A leaf is designed for photosynthesis and this process provides a supply of simple sugars for a plant.
(a) State the adaptation of the chloroplasts to photosynthesis.
(b) Name a mineral ion in chloroplast.
(c) (i) Name the tissues that translocates sugar from the leaves to other parts of the plants.
(ii) How is the tissue named in c(i) above adapted to its function?
(d) Write a word equation for the process of photosynthesis.
Date posted:
May 24, 2019
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Answers (1)
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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
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Answers (1)
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The figure below shows a light microscope.
(Solved)
The figure below shows a light microscope.
(a) State the functions of the parts labelled 1, 2, and 3.
(b) (i) State two differences between an electron microscope and a light microscope.
(ii) Give one advantage of using a light microscope over that of an electron microscope.
(c) Calculate the magnification that is obtained when an object is viewed with a X10 eye piece and a X100 objective lens.
Date posted:
May 24, 2019
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Answers (1)
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The figure below represents three cells 1, 2 and 3.
Identify the three regions of the root tip from which the cell were got from?
(Solved)
The figure below represents three cells 1, 2 and 3.
Identify the three regions of the root tip from which the cell were got from?
Date posted:
May 24, 2019
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Answers (1)
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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
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Answers (1)
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What is meant by bivalent chromosome.
(Solved)
What is meant by bivalent chromosome.
Date posted:
May 24, 2019
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Answers (1)
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Give three examples of complex carbohydrates.
(Solved)
Give three examples of complex carbohydrates.
Date posted:
May 24, 2019
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Answers (1)
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Name two sex-linked characteristics in human determined by genes located on Y- chromosome.
(Solved)
Name two sex-linked characteristics in human determined by genes located on Y- chromosome.
Date posted:
May 24, 2019
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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What is the importance of chewing food?
(Solved)
What is the importance of chewing food?
Date posted:
May 24, 2019
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Answers (1)
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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
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Answers (1)
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State the importance of the following features in gaseous exchange;
(i) The presence of cartilage in trachea and bronchi.
(ii) Alveoli, gill filaments and tracheoles being...
(Solved)
State the importance of the following features in gaseous exchange;
(i) The presence of cartilage in trachea and bronchi.
(ii) Alveoli, gill filaments and tracheoles being numerous in the respective organisms where they occur.
Date posted:
May 24, 2019
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Answers (1)
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With a reason, name the organelles that would be found in large numbers in cell of secretory glands.
(Solved)
With a reason, name the organelles that would be found in large numbers in cell of secretory glands.
Date posted:
May 24, 2019
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Answers (1)
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The table provided below shows stomata distribution on leaves A and B and their surface area.
(a) Identify the habitats of the plant from which leaf...
(Solved)
The table provided below shows stomata distribution on leaves A and B and their surface area.
(a) Identify the habitats of the plant from which leaf A was obtained.
(b) Give a reason for your answer in (a) above.
Date posted:
May 24, 2019
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Answers (1)
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Distinguish between Blood plasma and serum.
(Solved)
Distinguish between Blood plasma and serum.
Date posted:
May 24, 2019
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Answers (1)
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Give two nitrogenous bases in a DNA molecule.
(Solved)
Give two nitrogenous bases in a DNA molecule.
Date posted:
May 24, 2019
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Answers (1)
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State three sites of gaseous exchange in mesophytes.
(Solved)
State three sites of gaseous exchange in mesophytes.
Date posted:
May 24, 2019
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Answers (1)
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The diagram below shows an experiment on germination peas.
a) (i) What changes are observable at the end of the experiment?
(ii) Give the reason the...
(Solved)
The diagram below shows an experiment on germination peas.
a) (i) What changes are observable at the end of the experiment?
(ii) Give the reason the observation in a(i) above.
(b) If water had been used instead of caustic potash in the experiments, what would be observed?
Date posted:
May 24, 2019
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Answers (1)
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Why does food stored in a refrigerator remain unspoiled longer than it does under ordinary conditions?
(Solved)
Why does food stored in a refrigerator remain unspoiled longer than it does under ordinary conditions?
Date posted:
May 24, 2019
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Answers (1)