Air is drawn into trachae when the upper and lower parts of abdomen move apart. Air is then expelled from the respiratory system when the upper and lower parts of abdomen are flattened / brought together
Kavungya answered the question on October 1, 2019 at 08:16
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Explain four precautions that can be taken to prevent typhoid being transmitted
Date posted: October 1, 2019. Answers (1)
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Sickle – cell anaemia is a hereditary disease due to mutation of gene for normal haemoglobin to gene that causes sickle cell anaemia. What are the possible phenotype offspring of a man and a woman both heterozygous.
Date posted: October 1, 2019. Answers (1)
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Pollen from a red – flowered plant A was used to pollinate white flowered plant B, the seeds from which produced 157 red-flowered plants. When a red flowered plant C was pollinated by a white-flowered plant D, the resultant seeds gave rise to 84 red-flowered plants: and 91 white flowered plants. Assuming that plants A, B, C, and D were all of the same species and that flower colour in that species is controlled by a single pair of genes.
Using R for dominant gene and r for recessive gene, write down the genotypes of the following.
i)Plant A
ii)Plant B
iii)Progeny of A x B cross
iv)Plant C
v)Plant D
vi)Red flowered progeny of C x D cross.
Date posted: October 1, 2019. Answers (1)
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Date posted: October 1, 2019. Answers (1)
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Date posted: October 1, 2019. Answers (1)
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Date posted: October 1, 2019. Answers (1)
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A scientist has discovered a rare disease that attacks the respiratory system in insects. Name two parts of an insect, which are most likely to be damaged by the disease.
Date posted: October 1, 2019. Answers (1)
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Date posted: October 1, 2019. Answers (1)
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Date posted: October 1, 2019. Answers (1)
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Date posted: October 1, 2019. Answers (1)
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a)Heart cells
b)Kidney
(Solved)
Name the blood vessel that conveys blood to the
a)Heart cells
b)Kidney
Date posted: October 1, 2019. Answers (1)
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Phylum
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Give a brief classification of ticks as shown below
Phylum
Class
Date posted: October 1, 2019. Answers (1)
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Date posted: October 1, 2019. Answers (1)
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Date posted: October 1, 2019. Answers (1)
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Using a punnet square, explain why the view that “some women have a tendency to giving birth to girl or boy babies only” has no scientific foundation.
Date posted: October 1, 2019. Answers (1)
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Date posted: October 1, 2019. Answers (1)
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Date posted: October 1, 2019. Answers (1)
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Date posted: October 1, 2019. Answers (1)
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Date posted: October 1, 2019. Answers (1)