Why Have Biologists Hypothesized That the First Land Plants Had

question 47

Multiple Choice

Why have biologists hypothesized that the first land plants had a low,sprawling growth habit?

• A)At the time of the first land plants,the carbon dioxide,which is necessary for photosynthesis,was primarily located close to the ground.
• B)They were tied to the water for reproduction and thus needed to remain in close contact with the moist soil.
• C)The ancestors of land plants,green algae,lack the structural support to stand erect in air.
• D)Land animals of that period were small so they needed short plants to eat.
• E)There was less competition for space;only once land plants spread out did they start to grow upright.

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