Geography Questions and Answers - Form 2 End of Term 3 Exams 2021

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INSTRUCTIONS.

Answer all the questions in the spaces provided.

  1.  
    1. Show how geography is related to chemistry. (2mks)
    2. The diagram below shows the interrelation between geography and other disciplines.
      geof2t3q1
      1. Identify the discipline marked X and Y. (2mks)
      2. Name the subject marked Z. (1mk)
  2.  
    1. Give the forces responsible for the earth’s force. (2mks)
    2. State three effects of revolution of the earth. (3mks)
  3.  
    1. What is a rock? (2mks)
      1. Name three examples of intrusive igneous rocks. (3mks)
      2. Describe three ways in which sedimentary rocks are formed. (6mks)
  4.  
    1. With the aid of a diagram outline the formation of rift valley by tension theory. (5mks)
    2. Students are planning to carry out field study of an area affected by faulting.
      1. State the four importance of having a previsit of the area. (4mks)
      2. Give three disadvantages of using observation to study such an area. (3mks)
      1. Give three causes of earthquakes. (3mks)
      2. Name two major earthquake zones of the world. (2mks)
  5.  
    1. What is secondary vegetation? (2mks)
    2. Explain how the following factors influence the distribution of vegetation.
      1. Aspect (2mks)
      2. Precipitation (2mks)
      3. Identify three vegetation zones in Kenya. (3mks)
    3. The diagram below represents zones of natural vegetation on a mountain within the tropical region. Use it to answer questions that follow.
      geof2t3q5c
      1. Name the vegetation zone marked D, E, F. (3mks)
      2. Describe the characteristics of tropical savannah vegetation. (8mks)
    4. State four significance of vegetation to human activities. (4mks)
  6.  
    1. What is weather forecasting? (2mks)
    2. List three problems of weather forecasting. (3mks)
    3. State three ways in which weather forecasting is important to human activities. (3mks)


MARKING SCHEME

  1.  
    1. Show how geography is related to chemistry. (2mks)
      • Geography applies chemistry to study the chemical composition of rocks/soil.
      • Geography use chemistry to explain chemical changes that take place in rocks/soils.
    2. The diagram below shows the interrelation between geography and other disciplines.
      geof2t3q1
      1. Identify the discipline marked X and Y. (2mks)
        • X – physiogeography
        • Y – economic geography
      2. Name the subject marked Z. (1mk)
        • Demography
  2.  
    1. Give the forces responsible for the earth’s force. (2mks)
      • centripetal force
      • centrifugal force
    2. State three effects of revolution of the earth. (3mks)
      • Revolution causes the four seasons
      • Revolution causes changes in the position of the midday sun at different time of the year.
      • Revolution causes lunar eclipse
      • Revolution cause varying length of day and night.
  3.  
    1. What is a rock? (2mks)
      • Rocks are naturally occurring aggregates of minerals particles forming part of the solid crust of the earth.
      1. Name three examples of intrusive igneous rocks. (3mks)
        • Granite
        • Peridotite
        • Grabbro
        • Syenite
      2. Describe three ways in which sedimentary rocks are formed. (6mks)
        • Mechanically formed where the rocks fragment are transported by wind, water or ice and they are deposited in layers and over along period of time the sediments are compacted into hard rocks.
        • Organically formed rocks where the remains of plants and animals are deposited in layer such that over a long period of time.
        • Chemically formed sedimentary rocks where the dissolved minerals are transported into water bodies, the dissolved sediments will precipitate/evaporate are then compacted to form a hard rock.
  4.  
    1. With the aid of a diagram outline the formation of rift valley by tension theory. (5mks)
      • Layers or rocks are subjected to tensional forces.
      • Two normal fault develop.
      • Middle block subsides between two side block
      • Middle part forms depression called rift valley enclosed by escarpment
        geof2t3q4ANS
    2. Students are planning to carry out field study of an area affected by faulting.
      • State the four importance of having a pre-visit of the area. (4mks)
        • Enable them to draw up study objective and hypothesis.
        • Enable them prepare work schedule.
        • To familiarize themselves with the area of study.
        • To enable them prepare financial requirements.
      • Give three disadvantages of using observation to study such an area. (3mks)
        • It is expensive
        • It is time consuming
        • It is tiresome
        • It is only suitable for sighted people
      1. Give three causes of earthquakes. (3mks)
        • Gravitative pressure
        • Divergence/convergence of tectonic plate
        • Movement of magma
        • Folding
        • Isostatic adjustment
        • Energy release from the mantle
      2. Name two major earthquake zones of the world. (2mks)
        • The circum pacific belt
        • The tethyan belt
        • The great rift valley belt
        •  Mid atlantics ocean/belt
  5.  
    1. What is secondary vegetation? (2mks)
      • This is semi-natural or derived vegetation which is a plant cover growing naturally in a place but has been interfered with people and is the process of recovering from interference.
    2. Explain how the following factors influence the distribution of vegetation.
      1. Aspect (2mks)
        • There are a wide range of plants on the slopes focusing the sun and in the direction of rain.
        • Grass bands are dominant on the leeward side which is drier.
      2. Precipitation (2mks)
        • High rainfall area has a large number of plants such as forest which are broad leaved to increase the rate of transpiration.
        • Areas with little rainfall have scarcity vegetation of scrubs and desort type.
      3. Identify three vegetation zones in Kenya. (3mks)
        • Forest
        • Savanna
        • Semi-desert and desert
        • Health and moorland
        • Swamp vegetation
    3. The diagram below represents zones of natural vegetation on a mountain within the tropical region. Use it to answer questions that follow.
      geof2t3q5c
      1. Name the vegetation zone marked D, E, F. (3mks)
        • D – Rain forest
        • E – bamboo forest
        • F – heath and moorland
      2. Describe the characteristics of tropical savannah vegetation. (8mks)
        • Vegetation consist of a mixture of grass and trees.
        • Grass grow tall and closely together in some areas.
        • In drier areas grass is shorter.
        • Trees are umbrella shaped.
        • Acacia are dominant trees.
        • Trees shed leaves during the dry season.
        • The grass sprout and seeds germinate in wet seasons.
    4. Some tree species have long tap roots which reach ground water.State four significance of vegetation to human activities. (4mks)
      • Vegetation is the aesthetic value as it adds value to the landscape.
      • Vegetation binds the soil together protecting it from erosion by wind and rain.
      • Vegetation partly delay forming humus making soil fertile for agriculture.
      • Some plants roots, barks and leaves are used as medicine.
      • Some plants are eaten by people as food.
  6.  
    1. What is weather forecasting? (2mks)
      • Weather forecasting is the prediction of weather condition in a place.
    2. List three problems of weather forecasting. (3mks)
      • Inaccurate data
      • Defective instruments
      • Personnel with limited skills
      • Vagaries of nature such as earthquake
    3. State three ways in which weather forecasting is important to human activities. (3mks)
      • It determines times for sea and air travel.
      • Determines times when sporting activities take place.
      • Help to determine fishing activities and habits in area.
      • Help to plan farmer’s calendar of activities.
      • Help plan suitable clothing for the day.

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