(a) Thigmotropism/ haptotropism
(b) - Exposes leaves/ shoots to absorb maximum amount of light/ sunlight for photosynthesis;
- Enable roots of plants to seek/ search for water.
- Enable plants stems to obtain mechanical support especially those that lack woody stems.
- Enables roots to grow deep in soil for anchorage
- Enable pollen tube to grow towards embryo sac to facilitate fertilization
johnmulu answered the question on May 19, 2017 at 06:11
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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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(a) Name two vestigial structures in human beings.
(Solved)
(a) Name two vestigial structures in human beings.
(b) Why are some bacteria able to resist the effect of antibiotics?
Date posted:
May 19, 2017
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Answers (1)
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Explain the theory of evolution by natural selection.
(Solved)
Explain the theory of evolution by natural selection.
Date posted:
May 19, 2017
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Answers (1)
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State the importance of divergent evolution to organisms.
(Solved)
State the importance of divergent evolution to organisms.
Date posted:
May 19, 2017
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Answers (1)
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Explain how comparative embryology is an evidence for organic evolution.
(Solved)
Explain how comparative embryology is an evidence for organic evolution.
Date posted:
May 19, 2017
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Answers (1)
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Explain continental drift as an evidence of evolution.
(Solved)
Explain continental drift as an evidence of evolution.
Date posted:
May 13, 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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State three pieces of evidence that support theory of evolution
(Solved)
State three pieces of evidence that support theory of evolution
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 advantages of hybrid vigour.
(Solved)
State two advantages of hybrid vigour.
Date posted:
May 13, 2017
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Answers (1)
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State three structural differences between DNA and RNA.
(Solved)
State three structural differences between DNA and RNA.
Date posted:
May 13, 2017
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Answers (1)
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Differentiate between phenotype and genotype as used in genetics
(Solved)
Differentiate between phenotype and genotype as used in genetics
Date posted:
May 13, 2017
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Answers (1)
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State two advantages of hybrid vigour
(Solved)
State two advantages of hybrid vigour
Date posted:
May 13, 2017
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Answers (1)
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Give an example of a sex-linked trait in humans on:
Y - CHROMOSOME.
X - CHROMOSOME.
(Solved)
Give an example of a sex-linked trait in humans on:
Y - CHROMOSOME.
X - CHROMOSOME.
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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Tallness in pea plants is due to a dominant gene. Two tall pea plants were crossed and their F 1 generation were in the ratio of 3 tall: 1 short. using letter T to represents the gene for tallness and t for shortness give the
(Solved)
Tallness in pea plants is due to a dominant gene. Two tall pea plants were crossed and their F 1 generation were in the ratio of 3 tall: 1 short. using letter T to represents the gene for tallness and t for shortness give the
(a) (i) Genotype of the parents
(ii) Gamete of the parents
(iii) Genotype ratio of the F 1 generation
(b) What is meant by the term testcross in genetic studies?
Date posted:
May 13, 2017
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Answers (1)
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Name three types of chromosomal mutations.
(Solved)
Name three types of chromosomal mutations.
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 the function of Deoxyribonucleic acid (DNA) molecule.
(Solved)
State the function of Deoxyribonucleic acid (DNA) molecule.
Date posted:
May 12, 2017
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Answers (1)