Biology Topic Practice

Auxins and Plant Growth

Auxins are plant hormones that control growth in response to light (phototropism) and gravity (geotropism).

Where in the plant is auxin produced?

What is Auxins and Plant Growth?

"Auxin is a plant hormone which causes the elongation of cells in shoots and is involved in regulating plant growth."

Question 1

Which answer best completes the statement? ____ involves giving a mother FSH and LH to stimulate eggs

Question 2

Choose the correct option to complete the statement. ____ is when blood vessels narrow to keep heat in

Question 3

Which answer best completes the statement? FSH causes an egg to ____ in the ovary

Question 4

Which answer best completes the statement? ____ is a waste product formed from the breakdown of proteins

Produced in the tips of shoots and roots.

In shoots: Auxin makes cells grow more (elongate) on the shady side, bending the shoot to light.

In roots: Auxin inhibits growth on the lower side, causing the root to bend downwards.

Exam Tip

Auxin has opposite effects in the shoot (stimulates) compared to the root (inhibits).

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