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(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.
The chart below represents a simplified nitrogen cycle. What is represented by X, Y and Z?
What is the importance of the following in an ecosystem? (a) Decomposers (b) Predation
Name the organism that causes amoebic dysentery.
How is aerenchyma tissue adapted to its function
What is meant by: (i) Autecology (ii) Synecology
Name the causative agent of typhoid.
How are leaves of submerged plants adapted for photosynthesis?
(a) Name the bacteria found in root nodules of leguminous plants. (b) What is the role of the bacteria named in (a) above?
Ascaris lumbricoides in an example for an endo - parasite (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.
Explain why the carrying of wild beasts is higher than that for cattle in a given piece of land.
(a) Name the bacteria found in the root nodules of leguminous plant. (b) State the association of the bacteria named in (a) above with the leguminous plants.
The diagram below represents the nitrogen cycle (a) State the process labeled A.. D.. (b) Name the compound represented by B (c) Name the group of organisms labeled C (d) How would excess pesticides in the soil interfere with process A.
Why are green plants referred to as primary producers in an ecosystem?
Explain how birds of prey are adapted to obtaining their food.
State two ways in which some fungi are beneficial to humans.
Give a reason why two species in ecosystems cannot occupy the same niche.
Distinguish between a community and population.
Suggest three reasons why green plants are included in a fish aquarium.
State two ways by which the human immuno deficiency virus (H.I.V) is transmitted other than through sexual intercourse?
Give two reasons why primary productivity in an aquatic ecosystem decreases with depth.
What is the relationship between leguminous plants and bacteria found in their root nodules?
What is parasitism?
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.
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 web
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.
Describe how the quadrant method can be used to estimate the population of various species of plants in a given habitat.
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 (d)Suggest three ways in which the ecosystem would be affected if there was prolonged drought.
State three characteristics of the class Crustacea
(a) What is meant by the term binomial nomenclature? (b) State two guidelines that should be followed when typing scientific names.