IGCSE Biology Paper-4: Specimen Questions with Answers 211 - 212 of 279

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Passage

Modern technology can be used to increase the yield of crops.

Question 211 (2 of 5 Based on Passage)

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Short Answer▾

The use of chemicals, such as fertilizers, herbicides, and pesticides, is one of the developments used.

Suggest two dangers of using pesticides on farmland.

Explanation

  • Environmental threat
  • Numbers of crop pollinator decline
  • Food poisoning
  • Pesticide resistance
  • Bioaccumulation

Question 212 (3 of 5 Based on Passage)

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The use of chemicals, such as fertilizers, herbicides, and pesticides, is one of the developments used.

Suggest how the use of herbicides can be of benefit to crop plants.

Explanation

  • They kill unwanted plants.
  • Herbicides can be used on closely planted crops where other methods cannot be used. Most of the time one application of the herbicide is enough whereas other methods must be continually used.
  • They work fast.
  • Herbicides are relatively cheap, and most of the time cheaper than manual weeding.
  • They can destroy plants bearing diseases.
  • They help the crops grow by destroying the weed that causes harmful effects which include competition for water, nutrients, and light; interference of weeds with crop growth by the release of toxins; modification of soil and air temperatures and the harboring of pests.
  • They can be safely used as the manual and mechanical removing of weeds can destroy the crop.

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