Question 1

Which of the following best describes an autotroph?

Accepted Answer

An organism that produces its own food using inorganic substances and light or chemical energy

Question 2

Which structure in a plant leaf is primarily responsible for gas exchange with the environment?

Accepted Answer

Stomata

Question 3

What is the overall chemical equation for photosynthesis?

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 4

During the light reactions of photosynthesis, what is the primary function of the photosystems?

Accepted Answer

To absorb light energy and transfer electrons through the electron transport chain

Question 5

Which pigment is most effective at absorbing light in the blue and red regions of the visible spectrum, but reflects green?

Accepted Answer

Chlorophyll a

Question 6

Which of the following is NOT a function of the cuticle in land plants?

Accepted Answer

Facilitates gas exchange

Question 7

Which of the following best explains why seeds are considered an evolutionary advantage over spores?

Accepted Answer

Seeds contain a protective coat and stored food, allowing for greater survival in harsh conditions

Question 8

Which of the following is a key difference between C3 and CAM plants?

Accepted Answer

CAM plants fix carbon dioxide at night and store it as malate, while C3 plants fix carbon dioxide during the day

Question 9

A plant cell is exposed to a hormone that triggers a signal transduction pathway. Which of the following correctly lists the three main stages of this pathway?

Accepted Answer

Reception, Transduction, Response

Question 10

Which of the following is an example of a local signaling mechanism in plants?

Accepted Answer

Plasmodesmata-mediated movement of ions between adjacent cells

Question 11

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

Accepted Answer

It generates secondary xylem and phloem, contributing to the thickening of stems and roots

Question 12

Which of the following is a correct sequence of the three stages of the Calvin cycle?

Accepted Answer

Carbon fixation, Reduction, Regeneration

Question 13

A mutation prevents the formation of the Casparian strip in a plant root. Which process would be most directly affected?

Accepted Answer

Selective uptake of minerals into the vascular cylinder

Question 14

Which of the following best describes the role of a 'second messenger' in signal transduction?

Accepted Answer

It is a small molecule that relays signals from receptors on the cell surface to target molecules inside the cell

Question 15

Which of the following is a function of the root apical meristem?

Accepted Answer

Produces new cells for root elongation

Question 16

Which of the following is a correct match between a plant organ and its primary function?

Accepted Answer

Root – anchorage and nutrient uptake

Question 17

Which of the following best explains why threats to plant diversity should be taken seriously?

Accepted Answer

Plant diversity is essential for food security, medicine, and ecosystem stability

Question 18

Which of the following is a characteristic of non-vascular plants?

Accepted Answer

They lack specialized tissues for water and nutrient transport

Question 19

Which of the following is a real-world example of a signal that contributes to morphogenesis in plants?

Accepted Answer

Light direction influencing the growth of a plant shoot (phototropism)

General Biology Study Guide: Photosynthesis, Plant Structure, and Cell Signaling

Guida di studio - Domande di pratica

Study guide - Flashcard