Question

Sequentially arrange the following life cycle stages of ixodid ticks
(A). Larva
(B). Adult
(C). Nymph
(D). Egg
Choose the correct answer from the options given below:

• A. (A), (B), (C), (D).
• B. (B), (C), (D), (A).
• C. (D), (A), (C), (B).
• D. (D), (C), (A), (B).

Hint:

Remember that tick larvae have 6 legs (hexapod), while nymphs and adults have 8 legs (octapod).
This morphological distinction is a common question in entomology exams.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Ixodid ticks (hard ticks) undergo a complete metamorphosis characterized by four distinct morphological stages in their life cycle.
Detailed Explanation:
The developmental stages of hard ticks from the beginning of their life cycle are arranged as follows:
1. Egg (D): Laid by the fully engorged adult female tick on the ground/vegetation.
2. Larva (A): Also known as "seed ticks," these hatch from eggs.
They are small, active, and uniquely characterized by having only three pairs of legs (6 legs total).
They feed on a host and then molt.
3. Nymph (C): After the larval molt, the nymph emerges.
Nymphs are larger than larvae and possess four pairs of legs (8 legs total) but lack developed genital pores.
After feeding, they molt into adults.
4. Adult (B): The final stage, which has 8 legs, fully developed genital organs, and is sexually dimorphic (males and females are distinct).
Therefore, the correct chronological sequence is:
Egg (D) $\rightarrow$ Larva (A) $\rightarrow$ Nymph (C) $\rightarrow$ Adult (B).

Step 2: Final Answer:
This sequence matches with option (C).