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Phloem Elements: Sieve Cells and Sieve Tubes

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Phloem Elements: Sieve Cells and Sieve Tubes

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Questions and Answers

What is the orientation of tracheas with respect to the main axis of the stem?

Oblique

Parallel (correct)

Diagonal

Perpendicular

What is the composition of tracheas?

Specialized vessels

Cellular tissues

Living cells

Non-living tubes (correct)

Which plant groups are tracheas found in?

Both Gymnosperms and Angiosperms (correct)

Angiosperms only

Neither Gymnosperms nor Angiosperms

Gymnosperms only

What is the function of tracheas in plants?

Water and nutrient transport Signup and view all the answers

What type of cells form tracheas?

Vessel members Signup and view all the answers

What is the main function of sieve tube elements in plants?

Food transport Signup and view all the answers

In what type of plants do sieve tubes occur?

Angiosperms Signup and view all the answers

Which type of cells are sieve cells most similar to?

Tracheids Signup and view all the answers

What is the function of sieve cells and sieve tubes collectively known as?

Phloem loading Signup and view all the answers

Which of the following is true for sieve tube elements?

They have thick secondary cell walls Signup and view all the answers

What is the function of xylem fibers in plant anatomy?

Provide mechanical support Signup and view all the answers

What is the phlogenetically oldest type of conductive vessel in xylem?

Tracheids Signup and view all the answers

What is the function of wood parenchyma in xylem?

Store food and nutrients Signup and view all the answers

What is characteristic of tracheids in xylem?

They have thick, lignified walls with pits Signup and view all the answers

What is the function of libriform fibers in xylem?