Author Question: On a trip to the Southwest United States, you and a friend collect some seeds from a pion, a type of ... (Read 91 times)

penza · **on:** Jul 15, 2019

On a trip to the Southwest United States, you and a friend collect some seeds from a piñon, a type of pine tree. Your friend also gathers a small bagful of soil from under the piñon tree. Back home, both of you plant your seeds in commercial sterilized potting soil, but your friend adds a spoonful of the collected dirt to each of her pots. Her seedlings do better than yours. What is the likeliest explanation for your differences?
◦ The soil from the Southwest probably contained fungi able to establish a mycorrhizal association with the seedlings' roots.
◦ The soil from the Southwest probably contained nitrogen-fixing bacteria that colonized the seedlings' root nodules.
◦ Pine seedlings are better adapted to the sandy soil of the Southwest than to commercial potting mix.
◦ The soil from the Southwest probably contained macronutrients missing from the potting mix.

Shshxj · **Reply #1 on:** Jul 15, 2019

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