Question 1

Which of the following best describes the main function of the Casparian strip in plant roots?

Accepted Answer

It prevents water and dissolved minerals from passing through the cell walls of endodermal cells, forcing them to cross the plasma membrane.

Question 2

A plant is observed to have parallel leaf veins, scattered vascular bundles in the stem, and a fibrous root system. Which group does this plant most likely belong to?

Accepted Answer

Monocots

Question 3

Which of the following cell types is primarily responsible for the transport of water and minerals in plants, and what is a key structural feature that enables this function?

Accepted Answer

Tracheids; they have pits that allow water to move laterally between cells.

Question 4

Which equation correctly represents water potential ($$\Psi) in $$plant cells?

Accepted Answer

$$\Psi = \Psi_s + \Psi_p$$

Question 5

A plant growing in a dry, sandy environment has thick cuticles, sunken stomata, and reduced leaf surface area. What type of plant is this, and what is the main advantage of these adaptations?

Accepted Answer

Xerophyte; these adaptations reduce water loss through transpiration.

Question 6

Which of the following best explains why guttation occurs in some plants?

Accepted Answer

Root pressure forces water out of the tips of leaves when soil moisture is high and transpiration is low.

Question 7

Which of the following is a correct description of the mutualistic relationship in mycorrhizae?

Accepted Answer

Fungi increase the surface area for water and mineral absorption for the plant, while receiving carbohydrates from the plant.

Question 8

Which of the following best describes the role of the vascular cambium in a woody plant?

Accepted Answer

It produces secondary xylem and secondary phloem, contributing to the plant's increase in girth.

Question 9

A scientist measures the solute potential ($$\Psi_s) of a $$plant cell as $$-0.7$$ MPa and the pressure potential ($$\Psi_p) as$$ $$0.3$$ MPa. What is the water potential ($$\Psi) of $$the cell?

Accepted Answer

$$\Psi = -0.4$$ MPa

Question 10

Which of the following best describes the process of nitrogen fixation in plants?

Accepted Answer

Conversion of atmospheric $$N_2$$ into ammonia ($$NH_3) by $$bacteria such as Rhizobium or cyanobacteria.

Question 11

Which of the following is NOT a function of the plant cuticle?

Accepted Answer

Facilitating gas exchange by allowing CO$$_2 to $$diffuse into the leaf.

Question 12

Which of the following best describes the difference between primary and secondary growth in plants?

Accepted Answer

Primary growth increases length through apical meristems; secondary growth increases girth through lateral meristems.

Question 13

Which of the following best explains why stomata close during drought conditions?

Accepted Answer

To reduce water loss by limiting transpiration when water is scarce.

Question 14

Which of the following is a correct sequence of events in a plant cell's response to an environmental signal?

Accepted Answer

Reception → Transduction → Response

Question 15

Which of the following is a benefit of being an angiosperm compared to other plant groups?

Accepted Answer

Angiosperms have flowers and fruits that enhance pollination and seed dispersal.

Question 16

Which of the following best describes the function of sieve-tube elements in plants?

Accepted Answer

They transport sugars and other organic nutrients through the phloem.

Question 17

Which of the following minerals is most directly involved in the synthesis of chlorophyll in plants?

Accepted Answer

Magnesium (Mg)

Question 18

A plant's leaves are arranged in a spiral pattern around the stem. What is the term for this arrangement, and what is its adaptive significance?

Accepted Answer

Phyllotaxy; it maximizes light capture by minimizing shading of lower leaves.

Question 19

Which of the following best describes the 'cohesion-tension' hypothesis for water movement in plants?

Accepted Answer

Water is pulled upward through the xylem due to transpiration and the cohesive properties of water molecules.

Plant Structure, Growth, Adaptations, and Responses: Study Guide for General Biology

Guida di studio - Domande di pratica

Study guide - Flashcard