Pop quiz science

What are the two main vascular system tissues?

• Xylem

  • One way transport (DEAD)

• Phloem

  • -two way transport

Plant evolution

• Bryophytes

  • Non-vascular relies on diffusion

• Tracheophytes

  • Vascular plants

• Spermatophytes

  • Seed-bearing

Meristematic tissue

• Apical Meristems

  • located at root tips responsible for primary growth

• Lateral Meristems

  • responsible for increasing girth is plants

• Intercalary

  • responsible for rapid growth

What is Stomata

-Tiny pores on the underside of leaves

-Swollen (due to water) during the day to let in CO2

What is the cohesion-tension theory?

The idea that transpiration is the main driver of water in the xylem

What are photochromes?

-Help the plant measure the length of day and night

Short vs. Long day flowering plants

• Short

  • Flower only when the period of darkness is longer than the critical night length

• Long

  • The opposite

What is Phototropism

Auxins are produced at the tip of plant shoots, when light hits the plant, auxins move to the shaded side. This makes the shaded side elongate, physically bending the plant.

What are cytokinins?

While auxins drive height growth, cytokinins encourage width and branching

What is Ethylene?

Rotting or bruised fruit releases a certain toxin that affects other fruits near

What is Abscisic Acid?

ABA is a stress hormone, when a plant faces drought, ABA causes stomata to close to prevent water loss.