Lecture 3: Plant Anatomy_ Phloem Tissue

What is the primary function of phloem tissue in plants?

• Transport of water and minerals

• Transport of photosynthetic products

• Storage of nutrients

• Structural support

Which cells are primarily responsible for conducting substances in phloem?

• Companion cells

• Parenchyma cells

• Sieve tube elements

• Cambium cells

Companion cells and sieve tube elements originate from:

• Epidermal tissue

• Ground tissue

• Procambium cells

• Vascular cambium

What happens to the nucleus in mature sieve tube elements?

• It enlarges

• It divides

• It remains unchanged

• It degenerates

The substance deposited around sieve plate pores is:

• Lignin

• Suberin

• Callose (β 1,3 glucan)

• Cellulose

P-proteins in sieve tubes primarily function to:

• Aid in photosynthesis

• Plug sieve plates during injury

• Transport minerals

• Produce enzymes

The relationship between companion cells and sieve tubes is:

• Competitive

•  Independent

• Symbiotic and interdependent

• Temporary

During sieve tube element maturation, organelles:

• Multiply rapidly

• Move to the cell periphery

• Disappear completely

• Become more active

When viewed under a microscope, mature sieve tube elements appear:

• Densely packed

• Empty

• Spiral shaped

• Highly pigmented

What connects sieve tube elements and companion cells?

• Cell walls only

• Plasmodesmata

• P-proteins

• Callose deposits