Biology Test Plant Biology 3

Question 1

What is the primary pigment responsible for capturing light energy during photosynthesis?

Accepted Answer

Chlorophyll a

Answer

Chlorophyll a is the main photosynthetic pigment that directly participates in the light reactions by absorbing red and blue light.

Question 2

During which phase of the cell cycle does DNA replication occur in plants?

Accepted Answer

S phase

Answer

DNA replication occurs during the S (synthesis) phase of interphase, duplicating the entire genome before cell division.

Question 3

What type of root adaptation allows mangrove trees to exchange gases in waterlogged soils?

Accepted Answer

Pneumatophores

Answer

Pneumatophores are specialized vertical roots that extend above the waterline to allow gas exchange in oxygen-poor, flooded soils.

Question 4

Which layer of the leaf is responsible for most photosynthesis and has loosely packed cells to allow gas diffusion?

Accepted Answer

Spongy mesophyll

Answer

Spongy mesophyll cells have large air spaces between them that facilitate CO2 and O2 diffusion to and from chloroplasts.

Question 5

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

Accepted Answer

Forces water through the symplast into the vascular tissue

Answer

The Casparian strip is a waxy band in endodermal cell walls that blocks the apoplastic pathway, forcing water and solutes through the symplast into the stele.

Biology Practice Test

Biology Practice Test

Biology Test Plant Biology 3