Answer:
First image
Explanation:
You did not show the set up, but the best answer would be the first image.
Dry ice is very cold, and when it comes into contact with the warm air, it sublimates into gas, which we know as CO₂ gas. Gas takes up more space and volume that solids, so the expansion of the gas builds up pressure. Since there is not enough space in the flask, the overflows and pushes up into the balloon.
The difference in temperature between dry ice and warm air is big, so it gives the particles a big and fast boost, which splits them apart quickly. This is why it skips the liquid phase.
Answer:
a. movement can occur both upward and downward in the plant
Explanation:
The phloem loading causes the accumulation of sugars in the sieved elements generating a negative solute potential (quedas), with a drop in water potential (ψw), so water enters the sieved elements increasing the turgor pressure (ψp). With the discharge of phloem in the drain occurs lower concentration of sugars in the screened elements, increases the solute potential, becoming positive, thus the phloem water potential increases and thus the water leaves the conducting vessel. In the specific case of sugar movement in the phloem, it can be stated that this movement can occur both up and down in the plant.
