(2) Water and nutrients

(3) The stem transports leaves at the root.

2.( 1) Tomato fruit

Potato stem

Radish root

Peanut seed

(2) Petunia twines its stem

Vertical stem of camphor tree

Parthenocissus stem

Sweet potato stolon

Lotus root rhizome

Cactus succulent stem

3, (1) omitted

(2)① The stem has the function of transportation.

② Plants need water for growth.

③ Connecting roots and leaves; It has a transportation function.

Second, 1, experimental process:

(1) Put the rooted plants into one of the test tubes, and add water to the two test tubes respectively, so that the water levels in the two test tubes are the same.

(2) Drop a small amount of equal amount of edible oil into two test tubes with a dropper.

(3) Leave it at 1 for 2 days, and observe the change of water in two test tubes.

Experimental phenomena:

The water level of test tubes with plants is lower than that of test tubes without plants.

Experimental conclusion:

Roots can absorb water.

2. Drop a little cooking oil on the surface of the test tube with a dropper.

3. Compared with the two test tubes, the water level of the test tube with plants is lower than that of the test tube without plants.

4. Fixed function.