The filament of spirogyra were put into equal volumes of sugar solutions X and Y. After 5 minutes, filaments from solution X had their cells contents rounded up while those from Y were unaffected. The experiment shows that
A.
solution X was stronger than Y
B.
solution Y was stronger than X
C.
Spirogyra used up the sugar in solution X
D.
solution X is good for stimulating sexual reproduction in Spirogyra
The following are connected with the movement of a reflex action (1) Central nervous (2) Muscles (3) Skin (4) Sensory nerve (5) Motor nerve. Which of the following sequences indicates a correct path?
