Question 1

Which of the following best describes the function of the xylem in vascular plants?

Accepted Answer

Transport of water and minerals from roots to shoots

Question 2

A botanist observes a plant with a thickened periderm and abundant secondary xylem. What process is primarily responsible for these features?

Accepted Answer

Secondary growth from the vascular cambium

Question 3

Which of the following cell types is dead at maturity and provides structural support due to lignin deposition?

Accepted Answer

Sclerenchyma

Question 4

A plant is exposed to drought conditions. Which adaptation would most likely help reduce water loss?

Accepted Answer

Thicker cuticle on leaves

Question 5

Which of the following best explains why sieve tube elements are dependent on companion cells?

Accepted Answer

Sieve tube elements lack nuclei and rely on companion cells for metabolic functions

Question 6

Which tissue is primarily responsible for the increase in girth (width) of woody plants?

Accepted Answer

Vascular cambium

Question 7

A mutation causes a plant to lack functional guard cells. What is the most likely consequence?

Accepted Answer

The plant cannot regulate gas exchange and water loss

Question 8

Which of the following is a correct sequence of tissues from the outside to the inside of a typical woody stem?

Accepted Answer

Periderm → Cortex → Phloem → Xylem

Question 9

Which of the following best describes the role of the apical meristem in plant growth?

Accepted Answer

It is responsible for primary growth and elongation of roots and shoots

Question 10

A plant’s leaves are observed to have a high density of stomata on the lower epidermis. What is the most likely advantage of this adaptation?

Accepted Answer

It reduces water loss while allowing efficient gas exchange

Question 11

Which of the following best explains why lignin is important in vascular plants?

Accepted Answer

Lignin provides rigidity and waterproofing to cell walls

Question 12

Which structure is most directly involved in the transport of sugars produced during photosynthesis?

Accepted Answer

Sieve tube elements

Question 13

A plant is observed to have a ring of vascular bundles in its stem. This arrangement is most characteristic of which group?

Accepted Answer

Dicots (eudicots)

Question 14

Which of the following best describes the function of the pericycle in roots?

Accepted Answer

It gives rise to lateral roots

Question 15

Which of the following is a key difference between primary and secondary growth in plants?

Accepted Answer

Primary growth increases length, secondary growth increases girth

Question 16

A plant’s vascular cambium is damaged. Which process will be most directly affected?

Accepted Answer

Production of secondary xylem and phloem

Question 17

Which of the following best explains why tracheids and vessel elements are essential for plant survival?

Accepted Answer

They transport water and minerals throughout the plant

Question 18

Which of the following is a function of the mesophyll in plant leaves?

Accepted Answer

Site of most photosynthesis

Question 19

A plant is genetically modified to lack collenchyma cells. Which of the following is the most likely consequence?

Accepted Answer

The plant will have reduced flexibility and support in growing regions

Question 20

Which of the following best describes the relationship between plant structure and function?

Accepted Answer

Plant structures are specialized to optimize survival and reproduction

Plant Form and Function: Structure, Growth, and Development

Study Guide - Practice Questions