Answer:
A metalloid is used because it is a semiconductor and can become more conductive when more light shines on it. The most likely materials are crystalline silicon, amorphous silicon, gallium arsenide and organometallics (soluble platinum).
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<h2>Option-3</h2>
<h3>Hope it helps you </h3>
I believe the green substance s called chlorafill..
Chlorella is a genus of about thirteen species of single-celled green algae belonging to the division Chlorophyta. The cells are spherical in shape, about 2 to 10 μm in diameter, and are without flagella. Their chloroplasts contain the green photosynthetic pigments chlorophyll-a and -b. In ideal conditions cells of Chlorella multiply rapidly, requiring only carbon dioxide, water, sunlight, and a small amount of minerals to reproduce.