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Biology LC Revision (Mine) > Plants > Flashcards

Flashcards in Plants Deck (11)
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1

How do you know how old a woody plant is?

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.

2

What are sessile leaves?

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

3

What parts of a leaf contain the vascular tissue?

The petiole, midrib and veins

4

What type of venation occurs in monocots?

Parallel venation

5

What type of venation occurs in dicots?

Net venation

6

Why is xylem a dead tissue?

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

7

What is lignin?

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

8

Why is phloem a living tissue?

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

9

Cotyledon

A seed leaf

10

Monocotyledons

Have one cotyledon in the seed (one seed leaf)

11

Dicotyledons

Have two cotyledons in the seed (two seed leaves)