Energy source at the larva stage

At the larva stage, energy is obtained from leaves.

Explanation

During the larva stage, which is the early stage of development for many organisms, energy is crucial for growth, development, and survival. The larva needs energy to carry out various physiological processes and to fuel its growth and development.

Obtaining energy from leaves

During this stage, the larva obtains energy from leaves by consuming them as their primary source of food. The larva feeds on the leaves of plants, extracting nutrients and energy from them.

Feeding on leaves

The larva typically has specialized mouthparts that are adapted for chewing and consuming plant material. By feeding on leaves, the larva obtains the necessary nutrients, including carbohydrates, proteins, and fats, which are all important sources of energy.

Metamorphosis and energy needs

The larva stage is a critical period in the life cycle of many organisms as it precedes metamorphosis. Metamorphosis is a process of transformation where the larva undergoes significant changes in its body structure and physiology to develop into its adult form. This transformation requires a considerable amount of energy.

Photosynthesis

While photosynthesis is a process that converts sunlight into chemical energy in plants, it is not the direct source of energy for the larva at this stage. Photosynthesis occurs in plants, where specialized structures called chloroplasts convert sunlight, water, and carbon dioxide into glucose, a form of energy-rich carbohydrate. The larva, however, does not possess the ability to carry out photosynthesis.

Other options

- Option A: Egg yolk is a potential energy source for the embryo within the egg, but it is not relevant to the larva stage.
- Option C: Photosynthesis, as explained earlier, is not directly applicable to the larva stage.
- Option D: Soil is not a source of energy for the larva stage. Soil may provide other essential nutrients, but not energy.

Therefore, the correct answer is option B, which states that at the larva stage, energy is obtained from leaves. The larva consumes leaves as its primary source of food to obtain the necessary energy for growth and development.