IGCSE Biology Paper-1: Specimen Questions with Answers 180 - 180 of 208

Question 180

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Question

MCQ▾

The diagram shows how the appearance of a potted plant changes over a period of four days.

Diagram Shows the Plant

Diagram Shows the Plant

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Which environmental conditions are most likely to cause this change?

Which environmental conditions are most likely to cause this change? Which environmental conditions are most likely to cause this change?
light intensityhumidity
Ahighhigh
Blowhigh
Chighlow
Dlowlow

Choices

Choice (4)
a.D
b.B
c.C
d.A

Answer

c.

Explanation

Wilting is the loss of rigidity of the non-woody parts of plants. This occurs when the cells of the plant tissue especially leave have very low water content or no water content at all. Wilting is the defense of the plant against the absence of the water. When there is less amount of water present the leaves of the plant will wilt or roll themselves so that its surface area decreases and therefore the rate of transpiration which takes place through stomata will also decrease which in turn will also decrease the loss of water that is present in the plant. Therefore, wilting is the process where the non-woody part of the plants will lose their rigidity and curl or roll to decrease their surface area so that less of the water is the loss in the process of transpiration through stomata

Factors causing wilting: -

  • Lack of Water,
  • Soil Conditions,
  • Disease,
  • Pests,
  • Other Causes
Diagram Shows the Plant

Diagram Shows the Plant

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