Page 1 bio ch 6

Flashcard 1

Q: What are phytohormones?

A: Organic chemical messengers in plants that regulate growth, movement, and responses to stimuli.

Flashcard 2

Q: Name the main functions of phytohormones.

A:

Stimulate shoot and root growth

Promote tropic movements

Aid fruit ripening

Promote flowering

Break seed dormancy

Regulate stomatal movement

Flashcard 3

Q: What plant parts are responsible for growth?

A: Meristematic tissues:

Apical & intercalary meristems increase length

Vascular cambium increases girth

Flashcard 4

Q: What are the 3 phases of plant growth controlled by hormones?

A:

Cell division

Cell enlargement

Cell differentiation

Flashcard 5

Q: How do phytohormones reach target parts of the plant?

A: They are produced in one part, transported by vascular tissues, or diffuse to other parts.

Flashcard 6

Q: Why are plant hormones also called Plant Growth Regulators (PGRs)?

A: Because some stimulate and some inhibit growth, collectively regulating plant development.

Flashcard 7

Q: How do plants respond to environmental stimuli without a nervous system?

A: Through phytohormones that coordinate slow chemical-based responses.

Flashcard 8

Q: What is an example of a rapid plant response to stimulus?

A: Mimosa pudica folds its leaves when touched.

Flashcard 9

Q: Why are plant responses slower than animal responses?

A: Because plants lack nerves and use chemical signals instead of fast electrical impulses.

Flashcard 10

Q: What external factors can influence hormone production in plants?

A: Conditions like drought, salinity, and light.

Flashcard 11

Q: Which structures help in the transport of plant hormones?

A: Vascular tissues (xylem and phloem).

Flashcard 12

Q: What are tropic movements?

A: Directional growth movements of plants in res

ponse to stimuli like light (phototropism), gravity (geotropism), etc.