Question

Animal in which larval stage is absent
A. Cockroach & Ascaris
B. Earthworm & Hydra
C. Frog & Amoeba
D. Ascaris & Earthworm

Answer 1

The larval stage is defined as an animal in an early stage of development that differs greatly in appearance from its adult stage. This stage undergoes metamorphosis in later stages to form the adult stage.

Step by step answer: Animal in which the larval stage is absent are Earthworm & Hydra.
The life cycle of an earthworm starts with an egg. It harbours a young earthworm that is ready to hatch. The egg is encased in a cocoon. In the cocoon, the number of eggs can vary between species. It ranges between 1 and 20 in the Lumbricid family. Once, the earthworm reaches adulthood, they become sexually mature to produce eggs for the next generation. They can produce between 3 and 80 cocoons every year. Earthworm species that live deep underground produces fewer cocoons because they are protected and are likely to hatch without any disturbance.
The life cycle of Hydra consists of three basic stages;
i. Planula; It is a larva-like structure but not a larva. It is about 1mm long.
Ii. Polyp stage; It is a sessile stage of the Hydra.
iii. Medusa stage; It is a gamete producing phase.
Hence, the correct answer is option B.

Note: A pupa stage is a phase an organism undergoes between immature and mature stages of the life cycle. In the stage, the larval structure ends and some insects develop wings. The pupa stage organism does not usually feed as they would get energy from the food that they had eaten in the larval stage.