Biology Test Practice Test: Video 5 Answers (25 Questions)

Question 1

Which plant hormone promotes cell elongation and is produced primarily in shoot apical meristems?

Accepted Answer

Auxin (IAA)

Answer

Auxin (indole-3-acetic acid) is produced in shoot tips and promotes cell elongation by loosening cell walls, driving phototropic and gravitropic responses.

Question 2

Which plant structure stores food reserves in a seed and nourishes the embryo during germination?

Accepted Answer

Endosperm

Answer

The endosperm is a nutrient-rich tissue in seeds that provides energy and nutrients to the developing embryo during germination.

Question 3

In C4 plants, where does initial CO2 fixation occur?

Accepted Answer

Mesophyll cells

Answer

In C4 plants, CO2 is initially fixed in mesophyll cells into a 4-carbon compound before being transferred to bundle sheath cells for the Calvin cycle.

Question 4

What structure regulates gas exchange in plant leaves?

Accepted Answer

Stomata

Answer

Stomata are pores in the leaf epidermis flanked by guard cells that open and close to regulate CO2 intake and water vapor loss.

Question 5

Which molecule serves as the primary energy currency of the cell?

Accepted Answer

ATP

Answer

ATP (adenosine triphosphate) stores and transfers chemical energy for cellular processes.

Biology Practice Test

Biology Practice Test

Biology Test Practice Test: Video 5 Answers (25 Questions)