Plant hormones and tissues

Written by Dr. Hira Salman (Biology)

MDCAT · Biology · 6 questions

Name: ____________________ Date: ____________

Which plant hormone speeds up fruit ripening?
- A Auxin
- B Gibberellin
- C Ethene (ethylene)
- D Cytokinin
Gibberellins promote:
- A Leaf fall
- B Seed dormancy
- C Closing of stomata
- D Stem elongation and seed germination
Which plant tissue gives mechanical support through thick, lignified walls?
- A Parenchyma
- B Sclerenchyma
- C Collenchyma
- D Epidermis
Cytokinins mainly stimulate:
- A Fruit ripening
- B Cell division
- C Dormancy
- D Leaf fall
Which hormone keeps seeds dormant and closes stomata during water stress?
- A Gibberellin
- B Auxin
- C Cytokinin
- D Abscisic acid
Meristematic tissue is responsible for:
- A Growth by cell division
- B Transport of water
- C Storage of food
- D Protection of the plant

Answer key

1. C, 2. D, 3. B, 4. B, 5. D, 6. A

Ethylene is a gas that triggers ripening, which is why a ripe banana can ripen fruit stored next to it.
Gibberellins make stems grow longer and help seeds break dormancy and germinate.
Sclerenchyma cells have thick, hard walls with lignin and give strength to the plant.
Cytokinins promote cell division and delay the ageing of leaves.
Abscisic acid is the stress hormone of plants. It maintains dormancy and makes guard cells close the stomata.
Meristems, at the tips of roots and shoots, contain cells that keep dividing.