Question 1

Which of the following best describes the main function of the root cap in a growing plant root?

Accepted Answer

It protects the apical meristem as the root pushes through soil.

Question 2

A botanist removes a ring of bark from around the entire circumference of a tree trunk (girdling). What is the most likely outcome for the tree, and why?

Accepted Answer

The tree will die because sugars cannot reach the roots through the phloem.

Question 3

Which of the following cell types is alive at maturity and primarily responsible for photosynthesis and storage in plants?

Accepted Answer

Parenchyma cells

Question 4

What is the main difference between monocot and dicot root systems?

Accepted Answer

Monocots have a fibrous root system, while dicots have a taproot system.

Question 5

Which structure in the leaf is primarily responsible for regulating gas exchange and water loss?

Accepted Answer

Stomata

Question 6

A plant is observed to have thick, water-storing leaves and a thick cuticle. In which environment is this plant most likely to be found?

Accepted Answer

A desert with scarce water availability

Question 7

Which of the following best explains why transpiration is essential for the movement of water and minerals from roots to leaves?

Accepted Answer

Transpiration creates a tension that pulls water upward through the xylem due to cohesion between water molecules.

Question 8

Which tissue system is responsible for the transport of water and dissolved minerals from roots to shoots?

Accepted Answer

Xylem (vascular tissue)

Question 9

A celery stalk is crunchy due to the presence of which type of cell, and what is its main function?

Accepted Answer

Collenchyma cells; provide flexible support

Question 10

Which of the following best describes the function of companion cells in phloem tissue?

Accepted Answer

They supply ATP and proteins to sieve-tube elements, maintaining their function.

Question 11

Which process is primarily responsible for the movement of sugars from leaves to roots in a plant?

Accepted Answer

Pressure-flow mechanism in phloem

Question 12

Which of the following adaptations would you expect to find in a plant living in a nutrient-poor, waterlogged environment?

Accepted Answer

Large, flat leaves for maximum sunlight capture

Question 13

Which of the following statements about secondary growth in woody plants is correct?

Accepted Answer

Secondary growth results from cell division in lateral meristems, increasing stem and root diameter.

Question 14

Which of the following best explains why legumes are able to thrive in nitrogen-poor soils?

Accepted Answer

They form mutualistic relationships with nitrogen-fixing bacteria in root nodules.

Question 15

Which of the following is a correct sequence of tissues from the outside to the inside of a young dicot root?

Accepted Answer

Epidermis → cortex → endodermis → vascular cylinder

Question 16

Which of the following equations best represents the process of photosynthesis occurring in leaf mesophyll cells?

Accepted Answer

$$6CO_2 + 6H_2O + 	ext{light energy} ightarrow C_6H_{12}O_6$ + 6O_2$$

Question 17

Which of the following is a function of the Casparian strip in plant roots?

Accepted Answer

It forces water and minerals to pass through endodermal cell membranes, filtering them before entering the xylem.

Question 18

Which of the following best describes the role of guard cells in plant leaves?

Accepted Answer

They regulate the opening and closing of stomata, controlling gas exchange and water loss.

Question 19

Which of the following is a real-world example of a modified stem, and what is its function?

Accepted Answer

A potato tuber; stores starch for the plant

Question 20

Which of the following best explains why sclerenchyma cells are important in the structure of woody plants?

Accepted Answer

They have thick, hardened cell walls that provide support even after the cells die.

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