Leaving Cert Ag Science Ch9 Plant Physiology

 Xylem tissue is made up of

• Companion cell and Sieve plate

• Companion cell and Tracheids

• Xylem Vessels and Tracheids

• Xylem Vessels and Sieve Plate

Where does gaseous exchange occur in a leaf?

• Palisade layer

• Epidermis

• Stomata

• Guard cells

Phloem tissue is made of

• Xylem Vessel and Tracheids

• Companion Cell and Sieve Plate

• Xylem Vessels and Companion Cell

• Companion Cell and Tracheids

The loss of water from the surface of a leaf by evaporation is called _________

• Transpiration

• Translocation

• Photosynthesis

• Respiration

Vascular tissue that transports water and minerals from a plant's roots is know as ______.

• xylem

• phloem

• stomata

• chlorophyll

The plant tissue that carries food materials from the leaves to the rest of the plant is the _______.

• xylem

• phloem

• stomata

• chlorophyll

How do water enter the roots from the soil?

• diffusion

• osmosis

• active transport

• transpiration

What do the guard cells do?

• Control active transport

• Control nutrients moving into the cell

• Controls the rate of transpiration (loss of water through the leaf)

Xylem vessel elements are strengthened by

• melanin

• lignin

• cellulose

• chloroplast

How will lowered humidity affect the rate of transpiration?

• decrease it

• increase it

• no change