Question

Algae and other submerged plants float in water during day time and sink at night, because
A. They become light due to food material accumulation.
B. They lose weight at night.
C. They become buoyant due to accumulation of O2 as a result of photosynthesis.
D. None of the above

Answer 1

Hint: The established plants with flabby or limp stems and the greater part of their vegetative mass is beneath the water surface called the submerged plants. These plants, albeit little segments which may stick over the water. In general, the instances of submerged plants incorporate eelgrass, elodea, hydrilla, and pondweed. The sea-going plants that live entirely submerged in the water by small and large share.

Complete answer:
During the cycle of photosynthesis, phytoplankton produces Oxygen as a side-effect. Because of their immense and broad population, green growth and cyanobacteria are liable for roughly 50% of all the Oxygen found in the sea and our environment. During the day time, they become light because of the amassing of Oxygen. However, the opposite occurs during the night.
In Day time, the algae are creating Oxygen. At the point when enough Oxygen is created during the day, it gets caught in air pockets, and it can lift the clusters to the surface. At night, this Oxygen is burned-through, and CO2 is delivered. In this way, algae sinks.
As carbon obsession and oxygen creation are essential for a similar cycle, the degree of phytoplanktons support is on a similar scale. Phytoplankton burns-through a comparable measure of carbon dioxide as all land plants joined. While phytoplankton can pull carbon dioxide from the climate or the sea, it will have a comparable impact. The carbon dioxide that is taken from the water is supplanted via carbon dioxide from the climate.

Hence, the correct answer is option (C).

Additional information:
The plants convert daylight, water, and carbon dioxide into stored energy as long chains of sugar, called starch. Around evening time, the plants consume this stored starch to fuel proceeded with development. If the starch store is used excessively quickly, plants will starve and lose weight during the night.
A few plants store overabundance food material as starch or fat, for the most part in a capacity root, tuber, or comparable structure. However, the most overabundance of food is redirected to new vegetative development or the seed/incipient organism.

Note: Algae and other submerged green plants frequently float in water during the daytime and sink around the evening time. They lose weight around evening time since fish and different creatures destroy their parts. They become light because of the aggregation of Oxygen because of photosynthesis. They become light because of the utilization of food. Algae and other green plants do oxygenic photosynthesis during day time. In this cycle, Oxygen is delivered as a result, which makes the plant body light permitting them to coast on a superficial level.