Plants

Question 1

How do you know how old a woody plant is?

Answer 1

The scale scars of a stem mark the locations of previous apical buds. The distance between two sets of scale scars represent one year of growth.

Question 2

What are sessile leaves?

Answer 2

Leaves that do not have a petiole (i.e. they are joined directly to the stem)

Question 3

What parts of a leaf contain the vascular tissue?

Answer 3

The petiole, midrib and veins

Question 4

What type of venation occurs in monocots?

Answer 4

Parallel venation

Question 5

What type of venation occurs in dicots?

Answer 5

Net venation

Question 6

Why is xylem a dead tissue?

Answer 6

The living contents of tracheids and vessels die before they reach maturity

Question 7

What is lignin?

Answer 7

Lignin is a strengthening material found in some plant cell walls. Lignified xylem forms the wood in trees.

Question 8

Why is phloem a living tissue?

Answer 8

Phloem is composed of sieve tubes and companion cells. As companion cells are alive, phloem is a living tissue.

Question 9

Cotyledon

Answer 9

A seed leaf

Question 10

Monocotyledons

Answer 10

Have one cotyledon in the seed (one seed leaf)

Question 11

Dicotyledons

Answer 11

Have two cotyledons in the seed (two seed leaves)