Question

In propagation through cuttings, the temperature in rooting medium is increased with electric cables producing:

• A. Twin scaling
• B. Totipotency
• C. Bottom heat
• D. Callus fusion

Hint:

Bottom heat is used in propagation beds to improve rooting of cuttings.

Answer 1

The Correct Option is C

Concept:
In vegetative propagation by cuttings, root initiation can be improved by maintaining a warm rooting medium.

Step 1: Understand the use of electric cables.
Electric cables are placed below the rooting medium to supply heat from the lower side. \[ \text{Electric cables below rooting medium} \Rightarrow \text{heat from bottom} \]

Step 2: Identify the term.
The heating of rooting medium from below is called bottom heat. \[ \text{Bottom heat} \rightarrow \text{warmer root zone} \]

Step 3: Importance in cuttings.
Bottom heat encourages callus formation and root initiation in cuttings. Thus, the temperature increase in rooting medium by electric cables is called bottom heat. \[ \therefore \text{Correct Answer is (C)} \]