IGCSE Biology Paper-4: Specimen Questions with Answers 43 - 44 of 279

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Question 43

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Diagram shows an arthropod. State two features, visible in Figure that show that Scorpio is an arthropod.

Diagram Shows an Arthropod

Explanation

  • Scorpio has segmented body.
  • They have eight legs
  • They have a pair of grasping pedipalps and the narrow, segmented tail, often carried in a characteristic forward curve over the back,
  • Ending with a venomous stinger.

Question 44

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Figure shows lily flower. Which type of pollination occur in such flower?

Figure Shows Lily Flower

Explanation

Self pollination is the transfer of pollen from the anther to the stigma of the same flower. This method of pollination decrease the genetic diversity and much less common than cross-fertilization.

Advantage of self pollination:

  • If a given genotype is well-suited, self-pollination helps to keep this trait stable in the species
  • Not being dependent on pollinating agents allows self-pollination to occur when bees and wind are nowhere to be found
  • Self-pollination can be an advantage when the number of flowers are small or widely spaced.

Disadvantages of self-pollination:

  • Lack of variation
  • Reduced health of the species

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