Correct Option
Bougainvillea, Cocoa, and Grapes are widely recognized for their propagation through stem cuttings. This method is a form of vegetative propagation where a segment of the stem is cut from the parent plant and placed in suitable conditions to develop roots and shoots, eventually growing into a new plant genetically identical to the parent. This technique is effective and commonly employed for these specific plants.
Incorrect Options
- Option (a): This option includes Bougainvillea (1) and Carnations (2). While Bougainvillea is propagated by stem cuttings, Carnations are typically propagated through terminal cuttings (a specific type of stem cutting) or layering. Their inclusion together makes this option less precise in the context of general stem cutting propagation.
- Option (b): This option omits Bougainvillea (1), a prominent example of a plant propagated by stem cuttings. Therefore, it is an incomplete and incorrect selection.
- Option (d): This option includes all four plants. While Bougainvillea (1), Cocoa (3), and Grapes (4) are unequivocally propagated by stem cuttings, the inclusion of Carnations (2) makes this option less accurate. Carnations are primarily propagated by terminal cuttings or layering, and are not as universally cited for general stem cutting propagation as the other three, making option (c) the most precise choice.