JAMB 2013 Biology · Question 41
A plant tissue that carries water and mineral salts is the
Options
- A.cambium
- B.xylem
- C.cortex
- D.phloem
Answer: B. xylem
Explanation written with AI and checked against the answer key
Step 1: Analyze the question The question asks which plant tissue carries (transports) water and mineral salts. This is a transport tissue question.
Step 2: Explain the concept Plants have two main vascular (conducting) tissues:
- Xylem: carries water and dissolved mineral salts from the roots upward to the stem and leaves. It is made of vessels and tracheids, which are dead, hollow, lignified cells.
- Phloem: carries manufactured food (sucrose and amino acids) from the leaves to other parts of the plant. This process is called translocation.
Step 3: Check each option
- A. Cambium: a meristematic tissue that produces new xylem and phloem, which is responsible for secondary growth (increase in girth). It does not transport anything.
- B. Xylem: transports water and mineral salts. ✔
- C. Cortex: a tissue of parenchyma cells between the epidermis and the vascular tissues. It mainly stores food and gives support.
- D. Phloem: transports food, not water and mineral salts.
Step 4: Answer The correct option is B. xylem.
Tip: Remember "X for eXit from the soil". Xylem moves water up from the roots, while Phloem moves Produced food (from photosynthesis). Also, xylem = water and minerals, phloem = food.
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