Which of the following is true about trichomes on the stem?

Correct option is B

The correct answer is (B) They are multicellular and may be secretory.

Explanation:

• Trichomes are specialized structures found on the surface of plant stems, leaves, and sometimes roots.
• They can be multicellular and secretory, meaning they can secrete substances such as resins, essential oils, or gums.
• Trichomes help in reducing water loss, protecting the plant from herbivores, and reflecting excess light.
• Some trichomes also play a role in defense by secreting toxic or irritating substances.

Information Booster:

• Multicellular trichomes may be branched or unbranched, depending on the species and type of plant.
• Secretory trichomes are found in many plants and contribute to the production of essential oils or glandular substances that can deter herbivores.

Additional Knowledge:

• Option A: They never function in water retention.
• Incorrect. Some trichomes do play a role in water retention by reducing transpiration or creating a protective barrier on the surface of leaves and stems.
• Option C: They are present only in the roots.
• Incorrect. Trichomes are primarily found on the stems and leaves, not just in the roots.
• Option D: They are always unbranched and unicellular.
• Incorrect. Trichomes can be branched or unbranched and can be unicellular or multicellular, depending on the plant.