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1. Phototaxis is movement in response to direction and intensity of light.
• Free-swimming algae such as Chlamydomonas usually tend to concentrate where light intensity is optimum and will respond to light by swimming towards it. This is an example of phototactic response.
2. Osmotaxis is movement in response to changes in osmotic conditions e.g. freshwater amoeba.
Survival Value
• Ensures favourable conditions for existence.
3. Chemotaxis is movement in response to concentration of chemical substances.
Wilfykil answered the question on February 28, 2019 at 11:51
- Define the following terms as used in Genetics:
(Solved)
Define the following terms as used in Genetics:
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2. Phenotype
3. Alleles
4. Homozygous
5. Heterozygous
6. Hybrid
7. Hybrid vigour or Heterosis
Date posted: February 28, 2019. Answers (1)
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Date posted: February 28, 2019. Answers (1)
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Describe how the human kidneys are structurally adapted to perform their functions.
Date posted: February 24, 2019. Answers (1)
- (a)(i)Explain why skeletal muscles are said to be antagonistic.
(ii)State two characteristics of skeletal muscles.
(b)State the role of flexor muscle in movement.
(Solved)
(a)(i)Explain why skeletal muscles are said to be antagonistic.
(ii)State two characteristics of skeletal muscles.
(b)State the role of flexor muscle in movement.
Date posted: February 24, 2019. Answers (1)
- How are the following structures of a leaf adapted to their functions:
(i)Petiole?
(ii)Veins?
(iii)Palisade mesophyll?
(iv)Guard cells?(Solved)
How are the following structures of a leaf adapted to their functions:
(i)Petiole?
(ii)Veins?
(iii)Palisade mesophyll?
(iv)Guard cells?
Date posted: February 24, 2019. Answers (1)
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What are the stages of pathogenesis of diseases?
Date posted: February 23, 2019. Answers (1)
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State the 2 types of micro organism and give their features.
Date posted: February 23, 2019. Answers (1)
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Date posted: February 23, 2019. Answers (1)
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Date posted: February 23, 2019. Answers (1)
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State the role of oxytocin in parturition.
Date posted: February 23, 2019. Answers (1)
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Name the two bones that articulate with the femur at its distal end.
Date posted: February 23, 2019. Answers (1)
- (a)With a reason,state the structure responsible for intermittent growth in an insect.
Structure.......
Reason......
(b)What is the hormone responsible for growth in an insect?(Solved)
(a)With a reason,state the structure responsible for intermittent growth in an insect.
Structure......
Reason......
(b)What is the hormone responsible for growth in an insect?
Date posted: February 23, 2019. Answers (1)
- State the causative agent and method of transmission of cholera.
(i)Causative agent......
(ii)Method of transmission.....(Solved)
State the causative agent and method of transmission of cholera.
(i)Causative agent......
(ii)Method transmission...
Date posted: February 23, 2019. Answers (1)
- Explain the role of intercoastal muscles in:
(i)Inspiration.
(ii)Expiration.(Solved)
Explain the role of intercostal muscles in:
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Date posted: February 23, 2019. Answers (1)
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(i)Natural immunity.
(ii)Artificial immunity.(Solved)
Explain the terms:
(i)Natural immunity.
(ii)Artificial immunity.
Date posted: February 22, 2019. Answers (1)