Which of the following is not considered a plant organ?

• A. Root
• B. Stem
• C. Spore
• D. Leaf

Answer: (C)

Verified step by step guidance

1. Begin by understanding what constitutes a plant organ. In biology, a plant organ is a functional part of a plant that is composed of tissues and performs specific functions. The primary plant organs are roots, stems, leaves, flowers, fruits, and seeds.
2. Examine the options provided: Root, Stem, Leaf, and Spore. Identify which of these are commonly recognized as plant organs.
3. Recognize that roots, stems, and leaves are fundamental plant organs. Roots anchor the plant and absorb water and nutrients, stems support the plant and transport nutrients, and leaves are involved in photosynthesis.
4. Consider the term 'Spore.' Spores are reproductive units in plants, fungi, and some bacteria, but they are not considered organs. They are typically involved in the reproductive cycle, particularly in non-flowering plants like ferns and mosses.
5. Conclude that among the options given, 'Spore' is not considered a plant organ, as it does not fit the definition of a functional part composed of tissues performing specific functions like roots, stems, and leaves.