Leaving Certificate Biology Plant Responses 1 iQuiz SECOND Press the F5 Key to Begin, Then click on this Blue Box FIRST In PowerPoint 2007 if you see a Security Warning click HERE on Options… and then click on  Enable this content

Any change in the environment (internal or external) that causes a cell or organism to respond is called a … ImpetusPollutant VariationStimulus

The growth response of part of a plant to an external unidirectional stimulus is a … TropismStimulus AuxinIAA

A plant’s response to touch is known as … HydrotropismThigmotropism PhototropismGeotropism

The growth response of part of a plant away from an external unidirectional stimulus is a … Geotropism Positive tropismHydrotropism Negative tropism

What part of the plant produces plant growth regulators? PetiolesAxillary buds Apical budMeristems

A plant stem will grow upwards in the dark. What type of tropism is this? Positive phototropism Negative phototropism Negative geotropism Positive geotropism

The growth response of a plant to light is called … GeotropismPhototropism HydrotropismChemotropism

A term for a chemical that is a plant growth regulator or a plant growth hormone (e.g. IAA), produced in the meristematic tissue of shoots, roots, young leaves and developing seeds. AuxinHormone GibberellinCytokinin

Tendrils of the sweet pea plant wrap themselves around wire, stakes and itself. This is an example of … Reflex actionThigmotropism HabitConditioning

Plant growth hormones, which increase the rate of cell division and inhibit aging of green tissues in plants are … Gibberellins Selective weed killers CytokininsColeoptiles

The response of roots to fertilisers in the soil is an example of … ThigmotropismPhototropism GeotropismChemotropism

The suppression of the growth of the lateral buds by the terminal bud, thus allowing the stem to elongate is known as … Tropic responseAbscission Apical dominanceNegative tropism

A plant growth substance (auxin) that stimulates cell elongation is … CytokininIAA Ethene or ethylene Selective weed killer

A plant growth promoter which stimulates cell elongation and germination is a … CytokininsGibberellins Selective weed killer Coleoptiles

Name a plant growth substance used to promote ripening of some fruits, de- greens others and promotes abscission and inhibits longitudinal growth. TropismIAA Selective weed killer Ethene or ethylene

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