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(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
- (a) What is a tropic response?
(b) State two ways by which auxins regulate growth in seedlings. (Solved)
(a) What is a tropic response?
(b) State two ways by which auxins regulate growth in seedlings.
Date posted: May 19, 2017. Answers (1)
- 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. Answers (1)
- (a) Name the hormone that is responsible for apical dominance.
(b) What is thigmotropism? (Solved)
(a) Name the hormone that is responsible for apical dominance.
(b) What is thigmotropism?
Date posted: May 19, 2017. Answers (1)
- (a) What name is given to response to contact with surface exhibited by tendrils and climbing stems in plants?
(b) State three biological importance of tropisms plants. (Solved)
(a) What name is given to response to contact with surface exhibited by tendrils and climbing stems in plants?
(b) State three biological importance of tropisms plants.
Date posted: May 19, 2017. Answers (1)
- 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. Answers (1)
- A shoot of seedling exposed to light on one side bends towards the source of light as it grows
(a) Name the response exhibited by the shoot of the seedling.
(b) Explain how the bending towards the source of light occurs (Solved)
A shoot of seedling exposed to light on one side bends towards the source of light as it grows
(a) Name the response exhibited by the shoot of the seedling.
(b) Explain how the bending towards the source of light occurs
Date posted: May 19, 2017. Answers (1)
- 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. Answers (1)
- (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. Answers (1)
- Explain the theory of evolution by natural selection. (Solved)
Explain the theory of evolution by natural selection.
Date posted: May 19, 2017. Answers (1)
- State the importance of divergent evolution to organisms. (Solved)
State the importance of divergent evolution to organisms.
Date posted: May 19, 2017. Answers (1)
- 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. Answers (1)
- (a) What is meant by convergent evolution?
(b) State two limitations of fossils as an evidence of evolution. (Solved)
(a) What is meant by convergent evolution?
(b) State two limitations of fossils as an evidence of evolution.
Date posted: May 19, 2017. Answers (1)
- (a) State two ideas proposed by Lamarck in his theory of evolution.
(b) Why is Lamarck's theory not acceptable? (Solved)
(a) State two ideas proposed by Lamarck in his theory of evolution.
(b) Why is Lamarck's theory not acceptable?
Date posted: May 15, 2017. Answers (1)
- (a) (i) What is meant by vestigial structures?
(ii) Give an example of a vestigial structure in human.(Solved)
(a) (i) What is meant by vestigial structures?
(ii) Give an example of a vestigial structure in human.
Date posted: May 15, 2017. Answers (1)
- (a) What is fossil?
(b) How does convergent evolution occur?
(Solved)
(a) What is fossil?
(b) How does convergent evolution occur?
Date posted: May 15, 2017. Answers (1)
- (a) What is adaptive radiation?
(b) Give a reason why organisms become resistant to drugs. (Solved)
(a) What is adaptive radiation?
(b) Give a reason why organisms become resistant to drugs.
Date posted: May 15, 2017. Answers (1)
- Explain continental drift as an evidence of evolution. (Solved)
Explain continental drift as an evidence of evolution.
Date posted: May 13, 2017. Answers (1)
- What is meant by
(a) Organic evolution?
(b) Continental drift? (Solved)
What is meant by
(a) Organic evolution?
(b) Continental drift?
Date posted: May 13, 2017. Answers (1)
- Give reason why each of the following is important in the study of evolution:
(a) Fossils records.
(b) Comparative anatomy. (Solved)
Give reason why each of the following is important in the study of evolution:
(a) Fossils records.
(b) Comparative anatomy.
Date posted: May 13, 2017. Answers (1)
- State two advantages of natural selection to organisms. (Solved)
State two advantages of natural selection to organisms.
Date posted: May 13, 2017. Answers (1)