Plant Nutrition And Hydration

This is an MCQ-based quiz for GRE on the topic of Plant Nutrition And Hydration.

This includes carbon, hydrogen, nitrogen, oxygen, phosphorus, potassium, inorganic, organic, and gas (or clathrate) hydrates.

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How do plants transport water against gravity?

Capillary action Passive diffusion Water pumps Active transport Aquaporins

Which of the following best describes how water is transported from the roots of a tree to the tallest branches?

Transpiration from the tree's leaves causes tension (negative pressure) to increase in the tree's phloem. As water exits the leaves, the cohesion of water molecules pulls more molecules into the roots and upward. Transpiration from the tree's leaves causes tension (negative pressure) to increase in the tree's xylem. As water exits the leaves, the cohesion of water molecules pulls more molecules into the roots and upward. Transpiration from the tree's leaves causes tension (negative pressure) to increase in the tree's xylem. As water exits the leaves, the adhesion of water molecules pulls more molecules into the roots and upward. Transpiration from the tree's leaves causes tension (negative pressure) to increase in the tree's phloem. As water exits the leaves, the adhesion of water molecules pulls more molecules into the roots and upward.

The Calvin cycle takes place in the __________ and occurs __________.

cytoplasm . . . whenever the appropriate nutrients are present cytoplasm . . . only during the absence of light stroma . . . only during the absence of light stroma . . . whenever the appropriate nutrients are present

What is the purpose of photosystem II in photosynthesis?

Split water to create a high concentration of hydrogen ions Sequester carbon dioxide and facilitate its binding to rubisco Donate electrons to ATP synthase None of the other answers Donate electrons to NADP+ reductase

Which of the following structures is unique to plant cells?

Chloroplasts Endoplasmic reticulum Vacuoles Mitchondria Lysosomes

Which of the following can be found in plant cells, but not animal cells?

Mitochondria Cell membrane Chloroplasts Ribosomes

Where in the chloroplasts does the Calvin Cycle of photosynthesis take place?

Thylakoid membrane Stroma Thylakoid lumen Intermembrane space Grana

Guard cells of stoma are

Irregular in shape

Convex in shape

Long and cylindrical in shape

Kidney-shaped

Chlorophyll is found in oval-shaped structures known as