Question

QUESTION 1 Minerals such as potassium, chloride, and nitrogen move from the roots to the leaves cell to cell by diffusion in the conducting elements of the xylem using ATP to lift the minerals against gravity via electrostatic interactions with the cell walls through the phloem QUESTION 2 05 Phloem transport of sucrose can be described as going from source to sink." Which of the following would NOT normally function as a sink? a young growing leaf a growing root a fruit a mature leaf a shoot tip

Answer 1

1. in the conducting elements of xylem.

because xylem which transport minerals and water from root to leaves.

2. mature leaf

as mature leaf is capable of mobilizing organic compounds and producing photosynthate in excess of its own needs.

3. die because root lacks oxygen for respiration

because roots are constantly wet there is not enough air pocket. this result in limitation of oxygen supply and plant is not able to breath.

4. topsoil

topsoil contains dark organic matter that form by animal and plant decays.

5.leaching , burning of vegetation, wind erosion and harvesting of crop

these practices can decrease the soil fertility as they reducing the nutrients of soil. all are correct answers.

leaching is loss of water soluble plant nutrient, due to heavy rain.

wind erosion can reduce the topsoil humus an organic matter which decrease soil fertility.

burning of vegetation can burn humus tend to reduce soil fertility.

crop harvesting can reduce nutrient of soil hence it will reduce soil fertility. crop rotation is the solution through which soil can regain its nutrients.