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Encourages cross pollination and fertilization /Hinders self pollination and fertilization; leading to variations which may be useful to overcome some environmental pressures; thus continuity of species.
sharon kalunda answered the question on May 24, 2019 at 06:53
- Describe how osmotic pressure develops.(Solved)
Describe how osmotic pressure develops.
Date posted: May 24, 2019. Answers (1)
- What is carapace?(Solved)
What is carapace?
Date posted: May 24, 2019. Answers (1)
- An investigation was carried to show the effect of antidiuretic hormone (ADH) on urine production in a mammal. The rate of urine production was measured...(Solved)
An investigation was carried to show the effect of antidiuretic hormone (ADH) on urine production in a mammal. The rate of urine production was measured over a period of 30 minutes. Five minutes after measurements began; ADH was injected into a vein of the mammal. The results are shown in table below.
a) Plot a graph of rate of urine production against time.
b) Name the gland that releases ADH.
c) Describe the effect of injection of ADH on the rate of urine production in the mammal in this investigation.
d) Describe the mechanism by which ADH produces the effect seen in this investigation.
e) In a similar investigation, an injection of sodium chloride (salt) solution was given after five minutes instead of ADH. This injection was observed to affect urine production in a similar way to ADH. Suggest how the sodium chloride brought about this effect.
Date posted: May 24, 2019. Answers (1)
- State any two differences between an ovum and a sperm.(Solved)
State any two differences between an ovum and a sperm.
Date posted: May 24, 2019. Answers (1)
- Differentiate between Monoecious and Dioecious plant.(Solved)
Differentiate between Monoecious and Dioecious plant.
Date posted: May 24, 2019. Answers (1)
- State two ways in which male parts of a wind pollinated flower are adapted to their mode of pollination.(Solved)
State two ways in which male parts of a wind pollinated flower are adapted to their mode of pollination.
Date posted: May 24, 2019. Answers (1)
- The diagram below represents a mature fruit from a dicotyledonous plant. Observe it and answer questions that follow.
i) To what group of fruits does the...(Solved)
The diagram below represents a mature fruit from a dicotyledonous plant. Observe it and answer questions that follow.
i) To what group of fruits does the specimen belong? .
ii) Suggest the possible agent of dispersed of the fruit.
Date posted: May 24, 2019. Answers (1)
- The diagram below represents the nitrogen cycle.
a) State the process labelled.
A
D
b) Name the compound represented by B.
c) Name the group of organisms labelled...(Solved)
The diagram below represents the nitrogen cycle.
a) State the process labelled.
A
D
b) Name the compound represented by B.
c) Name the group of organisms labelled C.
d) i) Name the group of plants which promote process A.
ii) State the part of the plant where process A takes place.
e) How would excess pesticides in the soil interfere with process A.
Date posted: May 24, 2019. Answers (1)
- The diagram below shows a certain cell. Use it to answer questions that follow.
a) Identify the structures labelled A, B, C and D.
b) With a...(Solved)
The diagram below shows a certain cell. Use it to answer questions that follow.
a) Identify the structures labelled A, B, C and D.
b) With a reason identify the kingdom from which the cell was obtained.
Kingdom.
Reason.
Date posted: May 24, 2019. Answers (1)
- State the form in which carbohydrates are stored in
i) Plants.
ii) Animals(Solved)
State the form in which carbohydrates are stored in
i) Plants.
ii) Animals
Date posted: May 24, 2019. Answers (1)
- The diagram below show a part of a plant.
a) Identify the plant part.
b) Give a reason for your answer in (i) above.
c) Name...(Solved)
The diagram below show a part of a plant.
a) Identify the plant part.
b) Give a reason for your answer in (i) above.
c) Name the parts marked A and B.
Date posted: May 24, 2019. Answers (1)
- State two functional differences between the rods and cones in the human eye.(Solved)
State two functional differences between the rods and cones in the human eye.
Date posted: May 24, 2019. Answers (1)
- The diagram below represents a motor neurone.
a) With an arrow, indicate on the diagram the direction of the impulse through the neurone.
b) State the...(Solved)
The diagram below represents a motor neurone.
a) With an arrow, indicate on the diagram the direction of the impulse through the neurone.
b) State the function of parts labelled P and Q.
Date posted: May 24, 2019. Answers (1)
- Give a reason why constant body temperatures is maintained in human beings?(Solved)
Give a reason why constant body temperatures is maintained in human beings?
Date posted: May 23, 2019. Answers (1)
- What are the side effects of lactic acid accumulation?(Solved)
What are the side effects of lactic acid accumulation?
Date posted: May 23, 2019. Answers (1)
- Photograph P below is from a mammalian skeleton
i) Identify bone C and E
ii) Name the bone that articulates at point Q and the type of...(Solved)
Photograph P below is from a mammalian skeleton
i) Identify bone C and E
ii) Name the bone that articulates at point Q and the type of joint formed
Bone
Joint
Date posted: May 23, 2019. Answers (1)
- Below is a photograph obtained from the pelvic region of a human being and showing some bones of the vertebral column. Examine it carefully and...(Solved)
Below is a photograph obtained from the pelvic region of a human being and showing some bones of the vertebral column. Examine it carefully and answer the questions that follow.
a) Identify the bones labeled 1,2 and 3
b) (i) Name the type of joint formed at the proximal end of bone as 3 as it articulates with the adjacent bone (1mk)
(ii) Give an observable feature on bone 3 for your answer in (b) (i) above
c) (i) Identify the part labeled P
(ii)Give two functions of the part identified in (c) (i) above
d) Using observable features only, state how bone 1 is adapted to its functions
e) (i) Identify the part labeled Q
(ii) Give the function of the part labeled Q
Date posted: May 23, 2019. Answers (1)
- Study the photographs A and B that shows part of plants in natural habitat.
a) Name the type of the plant response shown in:
i) A
ii) B
b)...(Solved)
Study the photographs A and B that shows part of plants in natural habitat.
a) Name the type of the plant response shown in:
i) A
ii) B
b) Explain the mechanisms of the response in
A
B
c) State the biological significance of the response to plants in
A
B
d) Suggest the nature of the habitat that plants with the type of response A grows.
Date posted: May 23, 2019. Answers (1)
- Examine the photograph which shows parts of the urogenital system of a female rat and answer the questions that follow. The
organ marked 1 is the...(Solved)
Examine the photograph which shows parts of the urogenital system of a female rat and answer the questions that follow. The
organ marked 1 is the stomach.
a) i) Name the organ marked 2 .
ii) State two functions of the organ.
iii) What is the functional unit of the organ named in (a) (i) above?
b) i) Identify and name each of the organs marked 3 and 4.
ii) State two functions of the part marked 4.
c) i) Identify and name the organ marked 5.
ii) Explain two functions of the organ named c(i) above.
d) The organ marked 6 is the large intestine. State two functions of the large intestine.
Date posted: May 23, 2019. Answers (1)
- Examine the photograph of a fish shown below.
a) Name the fins responsible for the following during swimming.
i) Balance, break and change direction.
ii) Prevent fish...(Solved)
Examine the photograph of a fish shown below.
a) Name the fins responsible for the following during swimming.
i) Balance, break and change direction.
ii) Prevent fish from rolling and yawing
b) Explain the process of gill ventilation between part labelled S to part labelled T.
c) State one adaptation each for the structures labelled K and L.
d) Name the parts labelled U and W.
Date posted: May 23, 2019. Answers (1)