$\text{Average Stomatal Density} = \frac{S_1 + S_2 + S_3}{3}$

Question 1

Which major group of land plants does the organism in the first image belong to?

Accepted Answer

Nonvascular plants

Question 2

The plant in the second image is best classified as which type of land plant?

Accepted Answer

Seedless vascular plant

Question 3

The third image shows a plant with needle-like leaves and cones. Which group does it belong to?

Accepted Answer

Gymnosperms

Question 4

The fourth image shows a plant with colorful flowers. Which group does it belong to?

Accepted Answer

Angiosperms

Question 5

Which of the following is a key difference between gymnosperms and angiosperms?

Accepted Answer

Gymnosperms produce seeds in cones, while angiosperms produce seeds in flowers.

Question 6

Why must nonvascular plants, such as mosses, remain small and close to the ground?

Accepted Answer

They lack vascular tissue, so water and nutrients cannot be transported efficiently.

Question 7

Which adaptation allows seed plants to colonize dry environments more successfully than seedless plants?

Accepted Answer

Production of seeds that protect embryos from desiccation.

Question 8

What is the main function of stomata in plant leaves?

Accepted Answer

Regulating the uptake of CO2 and loss of H2O vapor.

Question 9

If a plant evolved in a desert environment, what would you predict about its stomatal density compared to a tropical plant?

Accepted Answer

Desert plants would have lower stomatal density to minimize water loss.

Question 10

Which equation would you use to calculate the average stomatal density from three fields of view?

Accepted Answer

$	ext{Average Stomatal Density} = \frac{S_1 + S_2 + S_3}{3}$

Question 11

A two-sample t-test is used to compare stomatal densities between two plant species. Which equation represents the t-test statistic?

Accepted Answer

$t = \frac{\bar{x}_1 - \bar{x}_2}{\sqrt{\frac{s_1^2}{n_1} + \frac{s_2^2}{n_2}}}$

Question 12

Why are stomata typically found on the underside of leaves?

Accepted Answer

To reduce water loss by minimizing direct exposure to air currents and sunlight.

Question 13

Which of the following is NOT a characteristic of angiosperms?

Accepted Answer

They produce naked seeds.

Question 14

In constructing a dichotomous key for major plant groups, which feature would best distinguish mosses from ferns?

Accepted Answer

Presence of vascular tissue

Question 15

Which plant group is most likely to be found in moist, shaded environments and why?

Accepted Answer

Nonvascular plants, because they require water for reproduction and lack vascular tissue.

Question 16

Which of the following statements about the waxy cuticle in plants is correct?

Accepted Answer

It prevents water loss but also slows CO2 uptake.

Question 17

Which plant group includes the world's largest organisms?

Accepted Answer

Seed plants

Question 18

What is the primary evolutionary advantage of the development of seeds in plants?

Accepted Answer

Protection and nourishment of the embryo, allowing survival in harsh conditions.

Question 19

Which of the following best describes the function of guard cells in the stomatal complex?

Accepted Answer

They regulate the opening and closing of the stoma to control gas exchange.

Question 20

If you were to create a dichotomous key for the four major plant groups, which characteristic would you use first?

Accepted Answer

Presence or absence of vascular tissue

Study Guide: Plant Diversity, Dichotomous Keys, and Stomatal Regulation

Study Guide - Practice Questions