Answer:
Plants acquire these building blocks by photosynthesis.
Explanation:
Photosynthesis can be described as a process by which plants produce glucose and oxygen from carbon dioxide and water in the presence of sunlight. Glucose can be described as simple carbohydrates or monosaccharides. It can form complex carbohydrates by forming polymers. Hence, we can say that photosynthesis is the process by which plants acquire building blocks to build complex carbohydrates like cellulose and starch. Cellulose is used to build cell walls whereas the starch is stored by the plants.
