Question

About 90% of total photosynthesis in the world is caused by
A. Bryophytes
B. Algae
C. Pteridophytes
D. Angiosperms

Answer 1

Hint: The most photosynthesis is done by the aquatic plants. They are autotrophic. They have a diverse variety of species. They can be unicellular or multicellular.

Complete answer:
Photosynthesis is the process by which the plants make their food by utilizing the sunlight. They take carbon dioxide from the atmosphere and release oxygen in the same way. The products formed of photosynthesis are sugars, water and oxygen.
Some plants are autotrophic which can make their food by photosynthesis while some depend on other sources for food, they are called heterotrophic.

Let us see which plants belonging to different phylums can make their food.
> Option A- Bryophytes: there are mostly non-vascular plants in the bryophyte category. Moses making the majority. They can harvest sunlight and make their food by photosynthesis. They can undergo a dry period by utilizing their stored water.

> Option B- Algae: These single-celled plants carry out the most photosynthesis in the world. They are present in the freshwater and ocean water. Chlorella was the first most studied algae.

> Option C- Pteridophytes: Ferns constitute the major part of this phyla. They are no flowering plants but can carry out photosynthesis. They do not make up the large contributors to the world photosynthesis amount.

> Option D- Angiosperms: they are the flowering plants with well developed vascular systems. They constitute 80% of the known plant species but do not contribute to the highest amount of photosynthetic plants.

So our answer is option B: Algae

Note: Glucose in the plants is also used to make starch for the long term storage of glucose. Chlorophyll gives leaves a green colour. Photosynthesis is performed in the chloroplasts in the leaves. Photosynthesis is the reverse of the cellular respiration process.