Which of the following rows in the table best compares the function of a plant's xylem and phloem? row xylem phloem 1 - transports glucose absorbed by the roots to the rest of the plant - alive at maturity - transports water and nutrients produced by photosynthesis in the leaves to the rest of the plant - dead at maturity 2 - transports glucose produced by photosynthesis in the leaves to the rest of the plant - dead at maturity - transports water and nutrients absorbed by the roots to the rest of the plant - alive at maturity 3 - transports water and nutrients absorbed by the roots to the rest of the plant - dead at maturity - transports glucose made during photosynthesis in the leaves to the rest of the plant - alive at maturity row 4

XYLEM: - transports water and nutrients absorbed by the roots to the rest of the plant

- dead at maturity

PHLOEM: - - transports glucose made during photosynthesis in the leaves to the rest of the plant.

- alive at maturity

Xylem is the plant tissue it's function is to conduct water from the roots and transfer it to all the parts of the plant structure. The xylem is composed of vessels, tracheids, xylem fibers and xylem parenchyma. Xylem vessels are the cells which are joined end to end and remain open at both ends helps in conduction of water. Tracheids are long and narrow they are dead cells. Their ends are not open and they help in upward conduction of water.  Xylem fibers are the cells that are dead at maturity. These cells provide strength to the plants. Xylem parenchyma are living cells, they help in conduction of water and also stores metabolites.

Phloem is the plant tissue that conducts food from the leaves to other parts of the plant. The phloem includes sieve tubes, phloem parenchyma, companion cells and phloem fibers.  Sieve tubes if formed by cylindrical cells that do not possess nucleus. They exhibit sieve plates at their ends which helps in conduction of food. Companion cells are associated sieve tubes they help in conducting the food materials. The phloem parenchyma cells are thin walled and they help in storage of food materials. Phloem fibers are scelerenchymatous and they provide mechanical support to the plant. All phloem cells remain alive in the maturity.  

about 40,000,000 results (0.81 seconds)  

search results

what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.