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- Self - sterility or incompatibility
- Protogyny and protandry
- Presence of special structure that attract agent of pollination
johnmulu answered the question on May 9, 2017 at 05:07
- Name two benefits that a parasite derives from the host (Solved)
Name two benefits that a parasite derives from the host
Date posted: May 8, 2017. Answers (1)
- (a) Name the organism that: (i) Causes malaria; (ii) Transmits malaria(Solved)
(a) Name the organism that: (i) Causes malaria; (ii) Transmits malaria
(b) State two control measures for malaria.
Date posted: May 8, 2017. Answers (1)
- Name the process through which free atmospheric nitrogen is converted into nitrates (Solved)
Name the process through which free atmospheric nitrogen is converted into nitrates
Date posted: May 8, 2017. Answers (1)
- The diagram below represents a certain plant.(Solved)
The diagram below represents a certain plant.
(a) What is the likely habitat for the plant?
(b) Give two reasons for your answer in (a)
Date posted: May 8, 2017. Answers (1)
- What is meant by the following terms?
(a) Ecology
(b) Carrying capacity (Solved)
What is meant by the following terms?
(a) Ecology
(b) Carrying capacity
Date posted: May 8, 2017. Answers (1)
- The figure below illustrates a food web in a certain ecosystem. (Solved)
The figure below illustrates a food web in a certain ecosystem.
From the food web:
(a) Draw the shortest food chain;
(b) Identify the organisms with the highest (i) Number of predators;
(ii) Biomass.
Date posted: May 8, 2017. Answers (1)
- What is meant by the following terms?(Solved)
What is meant by the following terms?
(a) Habitat;
(b) Ecosystem
Date posted: May 8, 2017. Answers (1)
- The diagram below shows a transverse section of a leaf. (Solved)
The diagram below shows a transverse section of a leaf.
(a) Name the habitat of the plant from which the leaf is obtained.
(b) Give two reasons for your answer in (a) above.
Date posted: May 8, 2017. Answers (1)
- State two ways in which aerenchyma tissue in aquatic plants are adapted to their function. (Solved)
State two ways in which aerenchyma tissue in aquatic plants are adapted to their function.
Date posted: May 8, 2017. Answers (1)
- Other than using the quadrat, give two methods of estimating population of grass. (Solved)
Other than using the quadrat, give two methods of estimating population of grass.
Date posted: May 8, 2017. Answers (1)
- (a) State three effects of dumping untreated sewage into a river.
(b) Name the disease in humans caused by plasmodium falciparum(Solved)
(a) State three effects of dumping untreated sewage into a river.
(b) Name the disease in humans caused by plasmodium falciparum
Date posted: May 8, 2017. Answers (1)
- (a) Name the causative agent of the following diseases in humans (i) Typhoid (ii) Amoebic desentery
(b) Name the disease in humans caused by plasmodium falciparum (Solved)
(a) Name the causative agent of the following diseases in humans (i) Typhoid (ii) Amoebic desentery
(b) Name the disease in humans caused by plasmodium falciparum
Date posted: May 8, 2017. Answers (1)
- Name two benefits that a parasites derives from the hosts. (Solved)
Name two benefits that a parasites derives from the hosts.
Date posted: May 8, 2017. Answers (1)
- State two characteristics of aerenchyma tissue. (Solved)
State two characteristics of aerenchyma tissue.
Date posted: May 8, 2017. Answers (1)
- Describe the three characteristics of a population (Solved)
Describe the three characteristics of a population
Date posted: May 8, 2017. Answers (1)
- State one way by which HIV/ AIDS is transmitted from mother to child. (Solved)
State one way by which HIV/ AIDS is transmitted from mother to child.
Date posted: May 8, 2017. Answers (1)
- State two ways in which schistosoma species is adapted to parasitic mode of life. (Solved)
State two ways in which schistosoma species is adapted to parasitic mode of life.
Date posted: May 8, 2017. Answers (1)
- (a) Distinguish between population and community.
(b) Name a method that could be used to estimate the population size of the following organisms (i) Fish in a pond
(ii) Black jack in a garden(Solved)
(a) Distinguish between population and community.
(b) Name a method that could be used to estimate the population size of the following organisms (i) Fish in a pond
(ii) Black jack in a garden
Date posted: May 8, 2017. Answers (1)
- (a) Distinguish between pyramid of numbers and pyramid of biomass.
(b) Give three reasons for loss of energy from one trophic level to another in the food chain.(Solved)
(a) Distinguish between pyramid of numbers and pyramid of biomass.
(b) Give three reasons for loss of energy from one trophic level to another in the food chain.
Date posted: May 8, 2017. Answers (1)
- The chart below represents a simplified nitrogen cycle. (Solved)
The chart below represents a simplified nitrogen cycle.
What is represented by X, Y and Z?
Date posted: May 8, 2017. Answers (1)