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THE NEW STUDENT'S REFERENCE WORK

c. ChemotaxSs:   sensitiveness to a onesided chemical stimulus 376.

d. Chemotrdpism:   sensitiveness to a onesided chemical stimulus 376.

e. Geotropism:   sensitiveness to the earth's gravitation 755.

f.  Heliotropism:   sensitiveness to a change in direction of light 859.

g. Hydrotropism:    sensitiveness to presence  of moisture  904. h. Phototaxis:   sensitiveness to unequal illumination 1479.

i. Rheotropism:   sensitiveness to a direction of current of water 1606. j. Thermotropism:   sensitiveness to heat coming from one side 1901. k. Twining:  caused by sensitiveness to contact 1960.

2. MEANS USED   FOR  POLLINATION:

a. Amenophilous plants:   using the wind for pollination;  gymnosperms 818.

b. Entomophilous plants:   using insects for pollination;  insects and flowers

930.

(1) Self-pollination:   pollen transferred to its own stigma 1519.

(2) Cross-pollination:   pollen   transferred  to   stigma    of    another

flower 1519.

a. Symbiosis: living together of plants 1859.

3. RELATION TO FOOD SUPPLY:

(1)  Parasitism:   in which the host is injured

1420.

(2)  Mutualism:   in which the host is benefited

1293.

(3)  Helotism:   in  which  the  host  is  neither

benefited nor injured 860.

b. Saprophytes:   which obtain food from decaying bodies and organic pro-

ducts 1678.

c. Carnivorous plants:   which capture insects for food 338.

d. Epiphytes:   getting all food from the air 622.

(1)  Free floating societies:  entirely sustained

by water.

(2) Pondweed   societies:    anchored   but   sub-

merged.

(2) Swamp societies: rooted in water but rising above surface.

f. Xerophytes:   adapted to dry soil and air 2117.

g. Halophytes:   growing in saline or alkaline soil 828.

h. Sensitive plants:  folding leaves to avoid drought and too intense light

1724. i. Geophilous plants:  with special structures for preservation 563.

4. DURATION   IN   PLANTS:   562.

a. Annual plant:   lasting a single season 75.

b. Biennial plant:   foliage one year, stalk the next 210.

c. Perennial plant:  living from year to year 1451.

e. Hydrophytes:  plants living in water 904.

2273