How do guard cells work in leaves?

What happens after pollen lands on the stigma of a flower? A. It grows a tube to travel down to the ovary. B. It fertilizes the plant at the stigma. C. It grows a tube to travel to the style. D. It grows a tube to travel to the petal.

How does a gymnosperm prevent itself from pollinating the same tree

Which describes a way in which phosphorus may enter into the phosphorus cycle? Earthquakes release phosphorus. Phosphorus is carried in the rain that was evaporated from lakes. Human use of fertilizers release phosphorus into the groundwater.

What is the only plant tissue that produces new cells by mitosis

The term fat-free on a food label is an example of a (n) :

Why did a cup of water empty while sitting in the sun

The most freely movable (and most easily damaged) joint in the body is the ___ joint

The heart is composed of how many loops?

The main molecule used by muscles in fueling their movement is called ATP. a. True b. False

How do guard cells work in leaves?