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.
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