WorksheetsC3.1 Integration of Body Systems (AHL) Reading Quiz
Total questions: 11
Worksheet time: 10mins
Match the following terms with their dictionary definition.
A phenomenon indicating the growth or turning movement of an organism, usually a plant, in response to an environmental stimulus.
Tropism
A growth response in an organism, typically a plant, where the plant or a part of the plant grows in the direction of an external stimulus.
Positive tropism
The directional growth of an organism, typically a plant, away from an environmental stimulus
Negative tropism
The movement of plants in response to light, either towards or away from light.
Phototropism
The movement of plants in response to gravity, either towards or away from the force of gravity.
Gravitropism (geotropism)
Match the following terms with their dictionary definition.
Plant hormones. Chemical compounds secreted by plants which regulate their physiological processes including growth and development.
Phytohormone
A group of hormones that stimulates lateral growth in meristem cells and inhibits elongation in the roots.
Auxin
A class of chemical signaling molecules consisting of small proteins and peptides.
Cytokine
A class of plant hormones that promote growth and development, stimulating processes like seed germination, stem elongation, flowering, and fruit development.
Gibberellin
A crucial plant hormone that regulates growth and stress responses, primarily by inducing seed dormancy, closing stomata under drought conditions to prevent water loss, and influencing other processes like leaf and bud development.
Abscisic acid (ABA)
Match the following terms with their dictionary definition.
A natural, gaseous plant hormone (C₂H₄) that regulates numerous developmental processes, most notably the ripening of fruits.
Ethylene
A pump which transports hydrogen ions across cell membranes to create a concentration gradient.
Proton Pumps
Pressure exerted by water present in a cell against the cell wall.
Turgor
Regions of undifferentiated cells at the tips of roots and shoots, in plants, that have the potential to become any cell type in the plant.
Meristems
True or False? Tropic movements result in growth of the plant only towards the stimulus.
True
False
Which of these phytohormone that acts as a plant growth inhibitor?
cytokinin
ABA
gibberellin
IAA
Identify which of the following are roles of auxins.
I. They inhibit the growth of lateral buds.
II. They cause falling of leaves.
III. They cause ripening of fruits.
IV. They cause cell elongation resulting in tropic movements.
IV only
III only
II and III only
I and IV only
Identify which of the following describe(s) the role of the efflux pumps.
I. Pump IAA out of cells that are closer to the light.
II. Set up concentration gradients that enable the movement of IAA.
III. Change their positions on the cell membrane to facilitate directional transport of auxin.
I, II and III
II only
II and III only
I and III only
Reorder the following into the correct sequence of events that cause cell elongation by auxin.
Auxin binds to receptors on the cell membrane. Proton pumps are activated.
Hydrogen ions decrease the pH of the cell wall.
Cellulose microfibrils of the cell wall break.
Influx of potassium ions is followed by water into the cell.
Increased turgor pressure stretches the cell wall.
True of False? Keeping a ripe banana with an unripe avocado will speed up the ripening of the avocado due to the release of ethylene by the banana.
True
False
Label the following Tropisms.
phototropism
gravitropism
thigmotropism
hydrotropism
Identify which of the following are ways of increasing the shelf-life of mangoes.
I. Keep the mangoes in a well-ventilated place.
II. Keep the mangoes in an airtight container.
III. Place the mangoes between layers of wheat straw.
I only
II only
III only
All of the Above
