They use two different systems - xylem moves water and mineral ions from the roots to the leaves - phloem moves food substances such as sucroseand amino acids from leaves to the rest of the plant.
Answer:
B. Molecules are moved against the concentration gradient.
Explanation:
Due to the higher concentration of the molecules of one of the sides than the other,in order to move molecules from the side with higher concentration of molecules to the side of lower concentration of molecules which is against the movement of molecules across the membrane, energy must be applied i.e atp.
Answer:
The correct answer is B. hypothyroidism
Explanation:
In hypothyroidism, the thyroid gland is not able to maintain an appropriate level of thyroid hormone in the blood. Thyroid hormone plays an important role in body metabolism and it also helps in proper growth and development of the body.
For the synthesis of thyroid hormone iodine is a very necessary mineral. 70-80% of all the iodine in the body is present in the thyroid gland which helps in making thyroid hormone. Iodine is obtained through diet and absence of iodine in the diet can lead to hypothyroidism in the body.
Answer:
False
Explanation
There is no substantial difference in electronegativities that would create a polar bond... electrons would NOT be unevenly distributed in O2, meaning that the molecule has a nonpolar covalent bond