Recall That Leaves Form in Distinct Arrangements (Whorled, Opposite, or Alternate)

question 172

Multiple Choice

Recall that leaves form in distinct arrangements (whorled, opposite, or alternate) on the stems of vascular plants. How might chemical factors cause new leaves to form in these particular patterns?

• A)Leaf primordia drain auxin from neighboring cells, with new primordia forming where auxin in the meristem surface is at the highest concentration.
• B)Leaf primordia secrete chemical activators that promote the formation of leaves nearby.
• C)Mature leaves secrete chemical inhibitors that prevent the formation of leaves nearby.
• D)Mature leaves secrete chemical activators that promote the formation of leaves nearby.

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Definitions:

Igneous Rock

A type of rock that forms through the cooling and solidification of magma or lava, with examples including granite and basalt.

Pyroclastic Eruption

A volcanic phenomenon involving the expulsion of hot gases, ash, and volcanic debris.

Dissolved Gas

Gases that are incorporated into magma and can expand, leading to explosive volcanic eruptions as pressure decreases.

Rhyolite

A mostly fine-grained, felsic igneous rock, generally of volcanic origin; can contain glass, volcanic ash, pieces of pumice, and variable amounts of visible crystals (phenocrysts).