Question

17. Explain the role of the following in transportation.
a) Xylem b) Pulmonary vein c) Lymph vessels
d) Phloem​

Answer 1

Answer:

1. The main function of xylem is to transport water, and some soluble nutrients including minerals and inorganic ions, upwards from the roots to the rest of the plant. However, it gets harder to work against gravity to transport materials as a plant grows taller, so xylem sets an upper limit on the growth of tall trees.
2. Pulmonary veins are responsible for carrying oxygenated blood from the lungs back to the left atrium of the heart. This differentiates the pulmonary veins from other veins in the body, which are used to carry deoxygenated blood from the rest of the body back to the heart. Humans have four pulmonary veins in total, two from each lung. There are two right pulmonary veins, known as the right superior and right inferior veins. These carry blood from the right lung. Each pulmonary vein is linked to a network of capillaries (small blood vessels) in the alveoli of each lung. Alveoli are tiny air sacs within the lungs where oxygen and carbon dioxide are exchanged. These capillaries eventually join together to form a single blood vessel from each lobe of the lung. The right lung contains three lobes, while the left lung is slightly small and contains only two lobes. Initially there are three vessels for the right lung, but the veins from the middle and upper lobes of the right lung tend to fuse together to form two right pulmonary veins. The right pulmonary veins pass behind the right atrium and another large blood vessel known as the superior vena cava.
3. The main function of the lymphatic system is to collect and transport tissue fluids from the intercellular spaces in all the tissues of the body, back to the veins in the blood system. Digested fats are absorbed and then transported from the villi in the small intestine to the bloodstream via the lymph vessels.
4. Phloem is the vascular tissue responsible for the transport of sugars from source tissues (ex. photosynthetic leaf cells) to sink tissues (ex. non-photosynthetic root cells or developing flowers). Other molecules such as proteins and mRNAs are also transported throughout the plant via phloem.

Answer 2

Answer: here is ur ans.

a. xylem : Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to stems and leaves, but it also transports nutrients.

b. pulmonary vein : The function of the pulmonary veins is to transport that oxygenated blood from the lungs to the heart. ... The function of the pulmonary arteries is to transport the de oxygenated blood to the lungs where it can be reoxygenated through diffusion.

c. lymph vessels : Their key function is to transport excessive tissue fluid from interstitial spaces throughout the body back to the blood stream. ... The key function of the capillaries of the lymphatic system is to absorb fluid leaked from the blood vessels into the interstitial space.

d. phloem : Phloem is the vascular tissue responsible for the transport of sugars from source tissues (ex. photosynthetic leaf cells) to sink tissues (ex. non-photosynthetic root cells or developing flowers). Other molecules such as proteins and mRNAs are also transported throughout the plant via phloem.

hope it helps....!

Explanation: