IGCSE Biology Paper-4: Specimen Questions with Answers 238 - 240 of 279

Passage

Deforestation occurs in many parts of the world.

Question 238 (4 of 4 Based on Passage)

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One Liner▾

Forests are important and complex ecosystems. State two likely effects of deforestation on the forest ecosystem.

Explanation

Effects of Deforestation

  • Flooding
  • Soil erosion
  • Climate change
  • Desertification
  • Fewer crops
  • Increased greenhouse gases
  • Harm wild life
  • Destroy habitat
  • Affect water cycle
  • Leave scars on environment.

Passage

The diagram shows a section through a leaf.

Vascular Bundle

Question 239 (1 of 6 Based on Passage)

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On the diagram, label a stoma, the cuticle, and a vascular bundle. Use label lines and the words “stoma” , “chloroplast” and “vascular bundle” on the diagram.

Explanation

Vascular Bundle
Mesophyll Cells

Question 240 (2 of 6 Based on Passage)

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Short Answer▾

Most photosynthesis in plants happens in leaves.

(i) Name the two raw materials needed for photosynthesis.

Explanation

Photosynthesis is the process by which plants and other organisms, such as algae and some bacteria synthesize their own food in presence of light. So, they are called autotrophs. Green plants capture energy from sun and convert it into chemical energy (food) with the help of taken from atmosphere, water from soil and releases oxygen.

Photosynthesis is important due to two reasons:

  • It is the primary source of all food on earth.
  • It is also responsible for the release of oxygen into the atmosphere by green plants.

The simplest equation for photosynthesis in higher plants and algae is given below:

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