Which statement describes the role of phloem within a plant? a) it transports food to all the parts of the plant both upwards and downwards. b) it transports water to all the parts of the plant only in the upward direction. c) it transports food to all the parts of the plant only in the downward direction. d) it transports water to all the parts of the plant both in the upward and downward direction.

It transports food to all the parts of the plant both upwards and downwards is the correct answer.

Explanation:

Phloem is tissue present in plants that transport the food prepare in the leaves to other parts of the plant.

Phloem has various types of specialized cells such as parenchyma cells, sieve elements, sclerenchyma, and companion cells.

Phloem transfers the food from source(leaves)to sink(to the other parts of the plant's cells), and in the spring process get reversed as the food stored in the sink move towards the developing buds through the phloem that's the reason phloem transports food to all the parts of the plant both upwards and downwards and movement of food is bidirectional.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%