30. What route does water take when it travels within plant cell cytoplasm? A. a

Question

30. What route does water take when it travels within plant cell cytoplasm? A. apoplastic B. symplastic C. transmembrane D. vascular 31. How does a companion cell move sucrose across its cell membrane? A. cotransported with protons (H+) B. diffusion through the plasma membrane C. cotransported with ions D. actively transported through an ion channel 32. What is bulk flow? A. The movement of liquids from areas of high to areas of low pressure B. Diffusion of solutes over long distances C. The transport of water through aquaporins D. Osmosis of water from one cell wall to the neighboring cell wall 33. Why does the evaporation of water out of a leaf pull water up through the xylem? A. cohesion between water molecules helps relay the force exerted by the B. adhesion between water molecules and the cell walls of the xvlem creates a C. transpiration generates an area of high water pressure in the leaves, which pushes evaporation of water out of a leaf vacuum at the root-soil interface water from the roots upward 34. A nitrate ion could end up in a vascular cylinder by more than one route. Which list describes a route that is possible? A. epidermis>Casparian strip->companion cell->phloem B. endodermis->epidermis->cortex->xylem C. stomata->xylem->endodermis->root hair D. root hair->parenchyma cell->endodermis-xylem 35. How does the time of year affect the direction of sugar movement in a plant? A. New leaves in spring are sugar sources, and mature leaves are sugar sinks B. In late summer, fruit are sugar sinks, then roots become sugar sinks C. Roots in early spring are sugar sinks, and flowers are sugar sources D. Fruits are sugar sources, and newly growing leaves are sugar sinks 36. Of the four steps listed here of the pressure flow hypothesis, which occurs last? A. sugar is loaded by companion cells into the phloem B. water flows into sieve tubes C. water flows into vessel elements D. sugar is unloaded by companion cells into parenchyma

Explanation / Answer

30. B. Symplast pathway.

In symplast pathway water moves via cytoplasm of the cell

31. D. Actively transported through an ion channel.

Sucrose moves into companion cell by active transport against its concentration gradient.

32. A. Movement of liquids from the areas of high to areas of low pressure.

Bulk flow is the movemnt of water and solutes akong pressure gradients.

33. C. Transpiration generates area of high water pressure in the leaves which pushes the water upward from the roots.

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