Question 1

Which of the following statements best describes a key difference between the Domains Bacteria and Archaea?

Accepted Answer

Bacteria have cell walls containing peptidoglycan, while Archaea lack peptidoglycan in their cell walls.

Question 2

Obligate anaerobes differ from facultative anaerobes in which of the following ways?

Accepted Answer

Obligate anaerobes cannot survive in the presence of oxygen, while facultative anaerobes can use oxygen but also survive without it.

Question 3

Which metabolic process is most likely to be found in both Bacteria and Archaea living in deep-sea hydrothermal vents?

Accepted Answer

Chemosynthesis

Question 4

What is the main ecological role of cyanobacteria in aquatic ecosystems?

Accepted Answer

Primary production through oxygenic photosynthesis

Question 5

Which of the following best explains the significance of the Theory of Endosymbiosis?

Accepted Answer

It proposes that mitochondria and chloroplasts originated from free-living prokaryotes engulfed by ancestral eukaryotic cells.

Question 6

Which evidence supports the endosymbiotic origin of mitochondria?

Accepted Answer

Mitochondria have their own circular DNA and ribosomes similar to those of bacteria.

Question 7

Which of the following is a major evolutionary trend observed in the transition from bryophytes to angiosperms?

Accepted Answer

Increasing dominance of the sporophyte generation over the gametophyte generation

Question 8

Which plant group exhibits the following life cycle: alternation of generations, with a dominant sporophyte and reduced gametophyte, and produces seeds but not flowers?

Accepted Answer

Gymnosperms

Question 9

During pollination in angiosperms, what is the primary function of the flower?

Accepted Answer

To attract pollinators and facilitate the transfer of pollen to the stigma

Question 10

Which of the following best describes secondary growth in plants?

Accepted Answer

Increase in thickness or girth due to activity of the vascular cambium and cork cambium

Question 11

Which structure in a plant root is responsible for regulating the movement of water and minerals into the vascular cylinder?

Accepted Answer

Endodermis

Question 12

Which hormone is primarily responsible for promoting cell elongation in plant stems?

Accepted Answer

Auxin

Question 13

A plant exhibits a positive phototropic response. What does this mean?

Accepted Answer

The plant grows toward the light source.

Question 14

Which of the following best describes the function of stomata in plant leaves?

Accepted Answer

Regulation of gas exchange and water loss

Question 15

Which of the following is a correct sequence for the general mechanism of how one stage of the plant life cycle leads to the next (from haploid to diploid)?

Accepted Answer

Gametes (n) fuse during fertilization to form a zygote (2n)

Question 16

Which of the following is NOT a function of the xylem in vascular plants?

Accepted Answer

Transporting sugars produced during photosynthesis

Question 17

Which plant hormone is most associated with fruit ripening?

Accepted Answer

Ethylene

Question 18

Which of the following best describes the Casparian strip in plant roots?

Accepted Answer

A band of cell wall material that blocks passive flow of substances into the vascular cylinder

Question 19

Which of the following equations correctly represents the process of photosynthesis?

Accepted Answer

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

Question 20

Which of the following is a correct description of alternation of generations in plants?

Accepted Answer

A life cycle in which plants alternate between multicellular haploid gametophyte and multicellular diploid sporophyte stages

General Biology: Plant Biology and Evolution – Study Notes

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