(a) Thigmotropism/ haptotropism
(b) Auxin migrate away from the point of contact; less auxins causes less elongation leading to less growth; The side further away from point of contact has higher concentration of auxins leading to more elongation hence more growth and stem curves/ twines along the supporting structures.
johnmulu answered the question on May 19, 2017 at 06:43
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State one survival value for each of the following plants:
(a) Thigmotropism in stems;
(b) Geotropism in roots
(Solved)
State one survival value for each of the following plants:
(a) Thigmotropism in stems;
(b) Geotropism in roots
Date posted:
May 19, 2017
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Answers (1)
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A response exhibited by a certain plant tendril is illustrated below
(Solved)
A response exhibited by a certain plant tendril is illustrated below
(a) (i) Name the type of response
(ii) Explain how the response named in (a)(i) above occurs
(b) What is the importance of tactic response to microscopic plants?
Date posted:
May 19, 2017
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Answers (1)
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During a lesson, students observed the structure of bat, cat and human forelimbs to determine their evolution relationship.
(Solved)
During a lesson, students observed the structure of bat, cat and human forelimbs to determine their evolution relationship.
(a) State the name given to the structure of the limbs observed by the students.
(b) Name the type of evolution illustrated by the structure of the limbs observed.
(c) What evidence of evolution is illustrated by the limbs?
(d) State the significance of the type of evolution illustrated by the limbs.
Date posted:
May 19, 2017
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Answers (1)
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State two advantages of natural selection to organisms.
(Solved)
State two advantages of natural selection to organisms.
Date posted:
May 13, 2017
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Answers (1)
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Give a reason why it is only mutation in genes of gametes that can influence evolution.
(Solved)
Give a reason why it is only mutation in genes of gametes that can influence evolution.
Date posted:
May 13, 2017
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Answers (1)
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State two characteristics that researchers select in breeding programme.
(Solved)
State two characteristics that researchers select in breeding programme.
Date posted:
May 13, 2017
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Answers (1)
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In a breeding experiment, plants with red flowers were crossed. They produced 123 plants with red flowers and 41 with white flowers
(Solved)
In a breeding experiment, plants with red flowers were crossed. They produced 123 plants with red flowers and 41 with white flowers
(a) Identify the recessive character. give a reason
(b) What was the genotype of the plants that gave rise to the plants with red and white flowers?
(c) If the white flowers were selfed, what would be the genotypes of their offspring?
Date posted:
May 13, 2017
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Answers (1)
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State three factors that contribute to the deceleration phase in the population phase in the population curve of an organism.
(Solved)
State three factors that contribute to the deceleration phase in the population phase in the population curve of an organism.
Date posted:
May 12, 2017
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Answers (1)
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State three aspects that can be used to estimate growth in seedlings
(Solved)
State three aspects that can be used to estimate growth in seedlings -
Date posted:
May 12, 2017
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Answers (1)
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In an experiment the shoot tip of a young tomato plant was decapitated as shown in the diagram below.
(Solved)
In an experiment the shoot tip of a young tomato plant was decapitated as shown in the diagram below.
(a) State the expected results after 2 weeks.
(b) Give a reason for your answer in (a) above
Date posted:
May 12, 2017
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Answers (1)
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Name a growth inhibitor in seeds.
(Solved)
Name a growth inhibitor in seeds.
Date posted:
May 12, 2017
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Answers (1)
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The diagram below represents a set up to investigate the conditions necessary for seed germination.
(Solved)
The diagram below represents a set up to investigate the conditions necessary for seed germination.
The set up was left for 7 days.
(a) What conditions were being investigated in the experiment?
(b) State three reasons for soaking seeds in set ups A and B.
(c) What were the expected results after seven days
Date posted:
May 12, 2017
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Answers (1)
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The diagram below represents human foetus in a uterus.
(Solved)
The diagram below represents human foetus in a uterus.
(a) Name the part labeled S.
(b)(i) Name the types of blood vessels found in the structures labeled Q.
(ii) State the differences in composition of blood found in the vessels named in (b) above
(c) Name two features that enable the structure labelled P carry out its function
(d) State the role of the part labeled R.
Date posted:
May 12, 2017
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Answers (1)
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The diagram below represents a stage during cell division
(Solved)
The diagram below represents a stage during cell division
(a) (i) Identify the stage of cell division
(ii) Give three reasons for your answer in (a) (i) above
(b) Name the structures labeled M.
(c) State the significance of this stage of cell division in living organisms.
Date posted:
May 9, 2017
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Answers (1)
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The chart below shows the number of chromosomes before and after cell division and fertilization in a mammal.
(Solved)
The chart below shows the number of chromosomes before and after cell division and fertilization in a mammal.
(a) What type of cell division takes place at Z.
(b) Where in the body of a female does process Z occur.
(c) Name the process that leads to addition or loss of one or more chromosomes
(d) Name the process that leads to addition or loss of one or more chromosomes
(e) State three benefits of polyloidy in plants to a farmer.
Date posted:
May 9, 2017
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Answers (1)
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Explain how the following prevent self-pollination. (i) Protandry (ii) Self-sterility.
(Solved)
Explain how the following prevent self-pollination. (i) Protandry (ii) Self-sterility.
Date posted:
May 9, 2017
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Answers (1)
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The diagram below illustrates the structure of the female part of a flower.
(Solved)
The diagram below illustrates the structure of the female part of a flower.
(a) Name the part labelled W.
(b) Describe what happens when pollen tubes enters the structure labelled V
(c) What do structures labelled R and T develop into after fertilization?
Date posted:
May 9, 2017
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Answers (1)
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State four characteristics of fruit dispersed by animals.
(Solved)
State four characteristics of fruit dispersed by animals.
Date posted:
May 9, 2017
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Answers (1)
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The diagram below illustrates a growing pollen tube.
(Solved)
The diagram below illustrates a growing pollen tube.
(a) Name the part labeled B.
(b) Explain the role of the parts labeled A.
Date posted:
May 9, 2017
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Answers (1)
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Name three mechanisms that ensure cross pollination takes place in flowering plants.
(Solved)
Name three mechanisms that ensure cross pollination takes place in flowering plants.
Date posted:
May 9, 2017
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Answers (1)