Question 1

Which of the following best describes the main source of carbon and oxygen used by plants to build organic molecules?

Accepted Answer

Atmospheric gases taken in through the leaves

Question 2

What is the primary function of root hairs in plant nutrition?

Accepted Answer

To increase the surface area for water and mineral absorption

Question 3

Which route allows water and minerals to move through the cell walls and extracellular spaces of plant roots?

Accepted Answer

Apoplastic route

Question 4

What is the role of the Casparian strip in plant roots?

Accepted Answer

It forces water and solutes to pass through the plasma membrane of endodermal cells

Question 5

Transpiration in plants is primarily driven by which process?

Accepted Answer

Evaporation of water from leaf surfaces

Question 6

Which property of water is most responsible for the upward movement of water through xylem vessels?

Accepted Answer

Cohesion and adhesion

Question 7

How do guard cells regulate the opening and closing of stomata?

Accepted Answer

By changing their turgor pressure in response to environmental signals

Question 8

Which of the following best describes the pressure-flow mechanism in phloem transport?

Accepted Answer

Sugars move from source to sink due to pressure differences created by water uptake

Question 9

Which of the following is a macronutrient required by plants in large amounts?

Accepted Answer

Nitrogen (N)

Question 10

What is the main advantage of mycorrhizal associations for plants?

Accepted Answer

They increase the absorption of water and minerals

Question 11

Which process is responsible for the uptake of nitrate ions ($$NO_3$$^-$$) by plant roots?

Accepted Answer

Cotransport with hydrogen ions ($$H^+)$$

Question 12

A plant growing in soil with a high clay content is likely to experience which of the following?

Accepted Answer

Good water retention but potential for poor aeration

Question 13

Which of the following is a correct statement about cation exchange in soils?

Accepted Answer

Cations are released from soil particles by the action of root-secreted acids

Question 14

Which of the following is a micronutrient for plants?

Accepted Answer

Zinc (Zn)

Question 15

Which adaptation allows carnivorous plants to thrive in nutrient-poor soils?

Accepted Answer

They obtain nitrogen by digesting insects

Question 16

Which of the following best explains why nitrate ($$NO_3$$^-$$) is more likely to be leached from soil than potassium (K$$^+$$)?

Accepted Answer

Nitrate does not bind to negatively charged soil particles

Question 17

Which of the following is a distinguishing feature of epiphytes compared to parasitic plants?

Accepted Answer

Epiphytes grow on other plants but do not extract nutrients from them

Question 18

A plant is showing symptoms of chlorosis (yellowing of leaves). Which nutrient deficiency is most likely responsible?

Accepted Answer

Nitrogen (N)

Question 19

Which of the following equations best represents the process of nitrogen fixation by bacteria?

Accepted Answer

$$N_2 + 8H^+ + 8e$$^- \rightarrow 2NH_3 + $$H_2$$

Question 20

Which of the following best describes the role of the proton pump in plant cells?

Accepted Answer

It generates a hydrogen ion gradient and membrane potential used for cotransport

Plant Nutrition and Transport: Uptake, Movement, and Soil Interactions

Study Guide - Practice Questions