15 Why is the stem of the bean plant growing upward?
A.
The stem is growing in response to the force of gravity.
B.
The stem is growing toward a source of light.
C. The stem is growing toward a source of oxygen.
D. The stem is growing away from a source of light.


16 How can Diagram 2 be identified?
A. male with Down syndrome
B. normal male
C. female with Down syndrome
D. normal female