CATS Biology and Physiology 2

Question 1

What is the primary function of lenticels on a tree's bark?

Accepted Answer

Gas exchange between inner tissues and atmosphere

Answer

Water absorption from rainfall

Answer

Nutrient transport from roots to leaves

Answer

Protection against insect boring

Question 2

Which vascular tissue is responsible for transporting sugars produced by photosynthesis downward through the tree?

Accepted Answer

Phloem

Answer

Xylem

Answer

Cambium

Answer

Pith

Question 3

In trees, what is the zone called where new xylem and phloem cells are produced?

Accepted Answer

Vascular cambium

Answer

Heartwood

Answer

Cork cambium

Answer

Endodermis

Question 4

What happens to a tree's stomata during periods of drought stress?

Accepted Answer

They close to reduce water loss

Answer

They open wider to increase CO2 uptake

Answer

They produce more guard cells

Answer

They convert to lenticels

Question 5

Which anatomical feature distinguishes hardwood (angiosperm) trees from softwood (gymnosperm) trees under a microscope?

Accepted Answer

Presence of vessels (pores)

Answer

Presence of resin canals

Answer

Presence of tracheids

Answer

Absence of growth rings

Question 6

What is the primary role of mycorrhizal fungi in association with tree roots?

Accepted Answer

Extending root surface area for water and nutrient absorption

Answer

Fixing atmospheric nitrogen into soil

Answer

Breaking down cellulose in dead wood

Answer

Producing antifungal compounds to protect roots

Question 7

What process describes water movement upward through xylem vessels driven by evaporation from leaves?

Accepted Answer

Transpiration-cohesion-tension

Answer

Osmosis

Answer

Root pressure alone

Answer

Capillary action alone