Chapter 9

Question 1

What are guard cells?

Answer 1

Guard cells are cells surrounding each stoma. They help to regulate the rate of transpiration by opening and closing the stomata.

Question 2

Intercalary meristem

Answer 2

intercalary (at internodes, or stem regions between the places at which leaves attach, and leaf bases, especially of certain monocotyledons—e.g., grasses)

Question 3

Internodes

Answer 3

A section or part between two nodes, as of a nerve or stem.

Question 4

What is a leaf scar?

Answer 4

The mark left on a twig after a leaf falls

Question 5

What is a leaf?

Answer 5

Typically a leaf is a thin, flattened organ borne above ground and specialized for photosynthesis, but many types of leaves are adapted in ways almost unrecognisable in those terms: some are not flat (for example many succulent leaves and conifers), some are not above ground (such as bulb scales), and some are without major photosynthetic function (consider for example cataphylls, spines, and cotyledons).