The chart below shows a feeding relationship in a certain ecosystem.
(a) Construct two food chains ending with a tertiary consumer in each case.
(b) Which organism has the largest variety of predators in the food web?
(c) Name secondary consumers in the food web.(Answered) Describe how the quadrant method can be used to estimate the population of various species of plants in a given habitat.(Answered) Oil can be applied on the stagnant water to control the spread of malaria.
(a) How does this practice control the spread of malaria.
(b) Give a reason why this practice should be discouraged.(Answered) The diagram below represents a feeding relationship in an ecosystem.
(a) Write down the food chains in which the guinea fowls are secondary consumers.
(b) What would be the short term effects on the ecosystem if lions invaded the area?
(c) Name the organism through which energy from the sun enters the food wed.(Answered) The diagram below represents a simplified nitrogen cycle.
(a) Name the organisms that cause process E and J
(b) Name the process represented by F and H.
(c) Name the group of organism represented by G.(Answered) Describe how the tapeworm is adapted to a parasitic mode of life.(Answered) What is the relationship between leguminous plants and bacteria found in their root nodules?(Answered) Give two reasons why primary productivity in an aquatic ecosystem decreases with depth.(Answered) State two ways by which the human immuno deficiency virus (H.I.V) is transmitted through sexual intercourse?(Answered) The herbivorous mammalian species were introduced into an ecosystem at the same time and in equal numbers. The graph below represents their populations during the first seven years.
Study the graph and answer the questions that follow.
(a) (i) Which species has a better competitive ability?
(ii) Give reason for your answer.
(b) Account for the shape of the curve of species A between:
(i) One year (Answered) Suggest three reasons why green plants are included in a fish aquarium.(Answered) (a) Distinguish between a community and population.(Answered) Explain how the various activities of man have caused pollution of air.(Answered) Give a reason why two species in ecosystems cannot occupy the same niche.(Answered) State two ways in which some fungi are beneficial to humans.(Answered) Explain how birds of prey are adapted to obtaining their food.(Answered) State four human activities that affect population of animals in game parks.(Answered) What is the importance of a national park to a nation?(Answered) Explain how leaves of mesophytes are suited to their functions.(Answered) Why are green plants referred to as primary producers in an ecosystem?(Answered) The diagram below represents the nitrogen cycle.
(a) State the process labeled: A and D
(b) Name the compound represented by B.
(c) Name the group of organisms labeled C.
(d) (i) Name the group of plants which promote process A.
(ii) State the part of the plant where process A takes place.
(e) How would excess pesticides in the soil interfere with process A?(Answered) (b) State the association of the bacteria named in (a) above with the leguminous plants.(Answered) Explain why the carrying capacity of wild beasts is higher than that for cattle in a given piece of land.(Answered) Ascaris lumbricoides is an example for an endoparasite.
(a) The name Ascaris refers to?
(b) State the habitat of the organism.
(c) State three ways in which the organism is adapted to living in its habitat.(Answered) How are leaves of submerged plants adapted for photosynthesis?(Answered) Name the causative agent of typhoid.(Answered) (a) What is meant by Autecology?(Answered) What is meant by Synecology?(Answered) How is aerenchyma tissue adapted to its function?(Answered) Explain how abiotic factors affect plants.(Answered) Name the organism that causes amoebic dysentery.(Answered) What is the importance of the following in an ecosystem?
(a) Decomposers
(b) Predation.(Answered) Distinguish between pyramid of numbers and pyramid of biomass.
(Answered) Give three reasons for loss of energy from one trophic level to another in the food chain.(Answered) 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.(Answered) State two ways in which schistosoma species is adapted to parasitic mode of life.(Answered) State one way by which HIV/AIDS is transmitted from mother to child.(Answered) Describe causes and methods of controlling water pollution(Answered) Describe the three characteristics of a population.(Answered) State two characteristic of aerenchyma tissue.(Answered) Describe the nitrogen cycle.(Answered) Name two benefits that a parasite derives from the host.(Answered) Name the causative agents of the following diseases in humans.
(i) Typhoid.
(ii) Amoebic dysentery.(Answered) Name the disease in humans caused by plasmodium falciparum.(Answered) State three effects of dumping untreated sewage into a river.(Answered) Name one process that is responsible for loss of energy from one trophic level to the next.(Answered) Other than using the quadrant, give two methods of estimating population of grass.(Answered) State two ways in which aerenchyma tissues in aquatic plants are adapted to their function.(Answered) What is meant by the term biological control?(Answered) Give an example of biological control.(Answered) What is eutrophication?(Answered) Name a substance that is responsible for acid rain.(Answered) 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.
(Answered) What is meant by the term Habitat?(Answered) What is meant by the term Ecosystem ?(Answered) What is meant by the term Carrying capacity?(Answered) 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) above.
(Answered) Name the process through which free atmospheric nitrogen is converted into nitrates.(Answered) State two control measures for malaria.(Answered) Other than using the quadrat, give two methods of estimating population of grass.(Answered) Explain the importance of protecting the forest ecosystem with reference to
the Climate change.(Answered) Explain the importance of protecting the forest ecosystem with reference to
the Biodiversity.(Answered) Explain the importance of protecting the forest ecosystem with reference to the Biotechnology.(Answered) Explain the importance of protecting the forest ecosystem with reference to the Water conservation(Answered) Explain the importance of protecting the forest ecosystem with reference to the Pollution.(Answered) State two limitations of using a quadrat to estimate the population of organisms.(Answered)
