Botany Test 4

Primary growth occurs at which meristem?

• Lateral meristem

• Apical meristem

• Vascular cambium

• Cork cambium

Which type of growth increases the thickness (width) of a plant’s stem?

• Apical

• Phototropic

• Primary

• Secondary

Which tropism is most important for vines wrapping around a trellis?

• Phototropism

• Gravitropism

• Hydrotropism

• Thigmotropism

Gibberellins are commonly used in agriculture to:

• Delay leaf aging

• Induce dormancy

• Increase fruit size

• Close stomata

A farmer notices uneven ripening in a tomato field. Which hormone treatment would help synchronize ripening, and why?

• Gibberellins, because they increase stem elongation

• Cytokinins, because they delay leaf aging

• Ethylene, because it promotes fruit ripening

• Auxins, because they control phototropism

Positive phototropism is growth:

• Toward light

• Away from water

• Toward gravity

• Away from touch

The process of shedding leaves, flowers, or fruit is called:

• Abscission

• Photosynthesis

• Transpiration

• Germination

If a plant is placed on its side in the dark, the shoots will grow upward. This is an example of:

• Positive gravitropism

• Negative gravitropism

• Positive thigmotropism

• Negative thigmotropism

Auxins suppress the growth of lateral buds. This effect is called:

• Phototropism

• Apical dominance

• Senescence

• Cytokinesis

Which hormone would likely be highest during autumn leaf drop?

• Auxins

• Cytokinins

• Ethylene

• Gibberellins