The diagrams below shows two weeds labeled A and B. Study them and answer questions that follow.

The diagrams below shows two weeds labeled A and B. Study them and answer questions that follow.



(a) Identify the weeds labeled A and B.

(b) Give one reason why the weed labeled A is referred to as a parasitic weed

(c) Name two crops that the weed illustrated A above commonly attack

(d) Give one reason why it is very difficult to control weed labeled B.

(e) State one cultural method of controlling weed labeled A.

---

(a) A- Striga (Witch weed)/ Striga hermontheca

B – Couch grass Digetaria Scalarum

b) Attaches itself to the roots of cereal crops and obtain nourishment from them.

c) Maize, Millet and Sorghum.

d) Has well developed underground rhizomes.

e) Crop rotation and trap cropping

---

marto answered the question on September 25, 2019 at 05:31

Exams With Marking Schemes

• Grade 1
• Grade 2
• Grade 3
• Grade 4
• Grade 5
• Grade 6
• Grade 7
• Grade 8
• Grade 9
• PP1
• PP2
• Playgroup
• Form 1
• Form 2
• Form 3
• Form 4

Related Questions

---

• Name three insect pests of cabbages. (Solved)
  

  Name three insect pests of cabbages.

  Date posted: September 25, 2019 .    Answers (1)

• a)what is opportunity cost as used in agricultural economics? b)State two conditions under which opportunity cost is said to be Zero (Solved)
  

  a)what is opportunity cost as used in agricultural economics?
  
  b)State two conditions under which opportunity cost is said to be Zero

  Date posted: September 25, 2019 .    Answers (1)

• Differentiate between pastoralism and nomadic pastoralism. (Solved)
  

  Differentiate between pastoralism and nomadic pastoralism.

  Date posted: September 25, 2019 .    Answers (1)

• State the factors considered when culling in dairy goats. (Solved)
  

  State the factors considered when culling in dairy goats.

  Date posted: September 13, 2019 .    Answers (1)

• Describe how a newly constructed pond is prepared and stocked with fingerlings. (Solved)
  

  Describe how a newly constructed pond is prepared and stocked with fingerlings.
  
  

  Date posted: September 13, 2019 .    Answers (1)

• The following illustrations show the behavior of chicks at different temperatures in a brooder. (Solved)
  

  The following illustrations show the behavior of chicks at different temperatures in a brooder.
  
  
  
  (a) Explain the temperature conditions in each of the four diagrams A, B, C and D.
  
  (b) State any other requirement of a good brooder.

  Date posted: September 13, 2019 .    Answers (1)

• Study the diagram below that shows the power transmission system in a tractor engine. (Solved)
  

  Study the diagram below that shows the power transmission system in a tractor engine.
  
  
  
  (i) Label the parts 1 – 4 .
  
  (ii) What technical term is used to refer to attaching an implement to a tractor.

  Date posted: September 13, 2019 .    Answers (1)

• The diagram below illustrates a livestock deficiency disease. Study the diagram and answer the questions that follow:- (Solved)
  

  The diagram below illustrates a livestock deficiency disease. Study the diagram and answer the questions that follow:-
  
  
  
  (a) Identify the disease
  
  (b) Identify the deficient nutrient.
  
  (c) Name two diseases that attack poultry
  
  d) State one role of the nutrient named in (b) above.

  Date posted: September 13, 2019 .    Answers (1)

• Outline four signs of calving in cattle. (Solved)
  

  Outline four signs of calving in cattle.

  Date posted: September 13, 2019 .    Answers (1)

• Describe harvesting of pyrethrum under the following subheading i) Method and procedure ii) Precautions (Solved)
  

  Describe harvesting of pyrethrum under the following subheading
  
  i) Method and procedure
  
  ii) Precautions

  Date posted: September 13, 2019 .    Answers (1)

• a) A farmer has 30 hectares of arable land,20 hectares of which is planted with maize and 10 hectares with grass hay. He wishes to... (Solved)
  

  a)
  A farmer has 30 hectares of arable land,20 hectares of which is planted with maize and 10 hectares with grass hay. He wishes to replace 10 hectares of maize with Irish potatoes next year. The fertilizer rate will have to be increased from 2 bags per hectare for maize to 4 bags per hectare for potatoes. As a result of the change extra 40 men days of casual labour per hectare will be necessary at the rate of Kshs.100 per man a day. The average yield per hectare of maize is 35 bags and for potatoes 120bags.The price paid is Kshs.1, 000 per bag of maize and Kshs.600 per bag of potatoes. Maize seeds cost Kshs.750 per hectare and potatoes cost Kshs.800 per hectare. Fertilizer costs are Kshs. 650 per hectare.
  
  i) Draw up a partial budget and advice the farmer accordingly.
  
  ii) Name the other type of budget that can be prepared by a farm manager.
  
  b) Discuss the various problems associated with land fragmentation.
  
  c) Explain four environmental factors that affect the effectiveness of herbicides.

  Date posted: September 13, 2019 .    Answers (1)

• Study the following photographs and use them to answer the question that follows. (Solved)
  

  Study the following photographs and use them to answer the question that follows.
  
  
  
  a) Identify the type of irrigation shown in the photograph.
  
  b) State any two advantages of the above method of irrigation.
  
  c) Other than the one shown above identify any other two methods that a farmer can use to irrigate his crops.

  Date posted: September 13, 2019 .    Answers (1)

• The following diagrams shows various samples of soil aggregates. (Solved)
  

  The following diagrams shows various samples of soil aggregates.
  
  
  a) Identify the type of soils structures.
  
  b) Briefly explain how soil structures P can be improved.
  
  c) Name two places where soil structure labeled S can be found.

  Date posted: September 13, 2019 .    Answers (1)

• The table below shows weekly demand for rice in a market. (Solved)
  

  The table below shows weekly demand for rice in a market.
  
  
  
  Calculate the elasticity of demand (Ed) for rice when the price falls from Kshs. 10 to Kshs. 9 per Kg. (show your working)
  
  

  Date posted: September 13, 2019 .    Answers (1)

• The following are photographs of weeds obtained from the farm. (Solved)
  

  The following are photographs of weeds obtained from the farm.
  
  
  
  i) Identify the weeds
  
  ii) State one major disadvantage of weed labeled A
  
  iii) Give two reasons why weed C is difficult to control.
  
  iv) State one economic importance of the weed labeled (B) to human beings

  Date posted: September 13, 2019 .    Answers (1)

• Name three field practices that are used to support weak stemmed crops. (Solved)
  

  Name three field practices that are used to support weak stemmed crops.

  Date posted: September 13, 2019 .    Answers (1)

• Outline four areas that should be avoided when collecting a soil sample for testing. (Solved)
  

  Outline four areas that should be avoided when collecting a soil sample for testing.

  Date posted: September 13, 2019 .    Answers (1)

• Name two types of labour records that can be kept by a large scale plantation farmer. (Solved)
  

  Name two types of labour records that can be kept by a large scale plantation farmer.

  Date posted: September 13, 2019 .    Answers (1)

• Name any four physical methods of water treatment. (Solved)
  

  Name any four physical methods of water treatment.

  Date posted: September 13, 2019 .    Answers (1)

• Identify two examples of intensive farming systems practiced in crop production. (Solved)
  

  Identify two examples of intensive farming systems practiced in crop production.

  Date posted: September 13, 2019 .    Answers (1)