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WAEC WASSCE Biology 2004 past questions and answers

This 2004 WAEC WASSCE Biology set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2004 set with instant marking.

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Sample WAEC WASSCE Biology 2004 questions

1. A sundew plant traps insects with sticky leaves, but it still depends on photosynthesis for most of its carbon; what nutrient does trapping insects chiefly supplement?
  1. Nitrogen
  2. Carbon dioxide
  3. Oxygen
  4. Water

Answer: A. Nitrogen

Insectivorous plants obtain nitrogen compounds from prey because they often grow in nitrogen-poor soils.

2. A plant grown without enough magnesium develops yellowing leaves because magnesium is required for the formation of which substance?
  1. Cellulose
  2. Chlorophyll
  3. Starch
  4. Lignin

Answer: B. Chlorophyll

Magnesium is an essential component of the chlorophyll molecule.

3. A complete ring of bark is removed from a woody stem without damaging the xylem; after several days, where are sugars most likely to accumulate?
  1. Below the ring, because xylem transports sugars downwards
  2. Equally above and below the ring, because water carries sugars through xylem
  3. Above the ring, because downward phloem transport has been interrupted
  4. Nowhere, because removing bark immediately stops photosynthesis

Answer: C. Above the ring, because downward phloem transport has been interrupted

Removing the phloem in the bark interrupts sucrose translocation and causes sugars to build up on the leaf side of the ring.

4. Blue cobalt chloride paper is placed against the underside of a leaf and turns pink; what does this observation show?
  1. The leaf is absorbing carbon dioxide through its lower surface
  2. The leaf is releasing oxygen through its lower surface
  3. The leaf contains starch in its lower epidermis
  4. Moisture is escaping from the leaf surface

Answer: D. Moisture is escaping from the leaf surface

Cobalt chloride paper changes from blue to pink when it absorbs water vapour released by the leaf.

5. Which tissue gives strong, rigid support to mature plant parts through thick, lignified walls and cells that are usually dead at maturity?
  1. Sclerenchyma
  2. Collenchyma
  3. Phloem
  4. Epidermis

Answer: A. Sclerenchyma

Sclerenchyma cells have thick lignified walls that provide rigid mechanical support.

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