Responses in flowering plants: growth regulation

Question 1

The growth of flowering plants can be controlled by what? (2)

Answer 1

The growth of flowering plants can be controlled by external and internal factors

Question 2

Give four external factors

Answer 2

light, day length, gravity, temperature

Question 3

How does light affect plant growth?

Answer 3

Light affects plant growth by providing the energy needed for photosynthesis. This in turn supplies the energy-rich molecules needed by plants for growth.

Question 4

Why is light needed by plantsto produce what? (other than as an energy source for photosynthesis)

Answer 4

In addition, light is needed to produce chlorophyll, fully formed chloroplasts, normal-sized leaves and strong stems.

Question 5

Why is day length important for the growth of flowering plants?

Answer 5

Day length plays a very significant role in causing plants to flower. It may also have a role in fruit and seed formation, dormancy, leaf loss and germination of some seeds.

Question 6

How does gravity affect the growth of flowering plants?

Answer 6

Gravity can cause roots to grow down into the soil, while shoots grow upwards away from gravity.

Question 7

How does temperature affect the growth of plants?

Answer 7

Temperature affects the growth of plants mainly by affecting the rate of reactions. As a result, plants grow faster at higher temperatures.

Question 8

Plants produce a range of chemicals called growth regulators. Where are these produced?

Answer 8

. These growth regulators are produced in the meristematic regions of the plant, such as in the root tip or shoot tip regions.