In insects, ecdysone takes part in

Options

A. Growth and development
B. Maturation into adult
C. Moulting till pupa is formed
D. Secretion of cuticle in adult.

Answer

### Step-by-Step Solution:

1. **Understanding Ecdysone**: Ecdysone is a steroid hormone, specifically a prohormone, that plays a crucial role in the growth and development of insects. It is commonly referred to as the molting hormone.

2. **Source of Ecdysone**: Ecdysone is secreted by the prothoracic gland, which is an endocrine gland in insects responsible for producing this hormone.

3. **Role of Ecdysone**: The primary function of ecdysone is to regulate the process of molting (ecdysis) in insects. This includes the shedding of the exoskeleton and the transition between different developmental stages.

4. **Developmental Transitions**: Ecdysone is involved in coordinating developmental transitions in insects, which includes both larval molting (the process where larvae shed their old skin to grow) and metamorphosis (the transition from larva to pupa and then to adult).

5. **Identifying the Correct Answer**: Among the given options, ecdysone's role in "molting till pupa is formed" aligns with its function in promoting the shedding of the exoskeleton and facilitating the transformation into the pupal stage.

6. **Final Answer**: Therefore, the correct answer to the question "In insects, ecdysone takes part in" is "molting till pupa is formed."