Science Fair Project Topic Ideas
Science fair project topic ideas should be
shared with your friends. You could try growing plants without soil.
This could be a very educational science fair topic. No digging. No
soil. No furry creatures to shoo away. Other science fair project
topics might include forecasting the weather by yourself. Science fair
project topic ideas like this enable you to make careful observations
of nature. This science fair project topic, with a few helpful devices
that you can make yourself, will help you make sure you dress correctly
for the forecasted weather. Science fair project ideas like this, if
you get really good at forecasting weather, might help you to get a job
on television. Other science fair project topics to consider is to
determine how good a detective you are.
A science fair project ideas like this will show you how sensitive your senses of touch, hearing, sight and smell
really are. What a fun science fair project topic this can be. It may
be one of the best science fair project topic ideas of all!
We now consider the plant richness of each of the world's continents. We begin with the Americas – North, Middle
The Americas (“The New World”) hold an estimated 133-138,000 species of
the c. 250,000 higher plants, the richest flora of any continent.
The flora of Middle and tropical South America, with an estimated 85,000
species, is the largest of all tropical floras, yet is the least
explored botanically. Even the adjacent Caribbean Islands have a richer
flora than that of Europe.
Brazil (56,000 species), Colombia (35,000), the two countries with the
largest floras of all, and Mexico, Venezuela, Ecuador, Peru, continental
USA and Bolivia are among the twelve countries with most plant species
(see Fact 15). Six of the 18 ‘Hot Spots’ proposed by conservationist
Norman Myers, together holding some 20% of world plant diversity, are in
the Americas – Atlantic Coast of Brazil, California Floristic Province,
Central Chile, Colombian Choco, Western Amazonia Uplands and Western
Most of Middle America, except Mexico, was forested until 40 or so years
ago, but today only 27-28% forest cover remains. Amazonia has fared
better, remaining largely intact despite much local destruction; at 5-6
million acres it is much the largest tropical forest in the world. But
the highland Andean forests have been destroyed for centuries, and now
have one of world's most diverse but threatened floras.
7 vascular plants are presumed extinct in the United States, 164
possibly extinct, 2530 imperiled or critically imperiled and 2556
vulnerable. Highest concentrations of threatened plants are in Texas,
California and Hawaii. Just over 3500 threatened plants have been
recorded in Middle America, 1119 of them endemic to Mexico.
Middle and South America, from S Mexico to Brazil, Paraguay and Peru, is
one of eight world centres of cultivated plant diversity (as proposed by
Vavilov). The Americas have given the Old World many staple vegetables.
Food crops of Middle and South American origin include Avocado, Cacao,
Manioc (Cassava), Papaya (Pawpaw), Peanut (Groundnut), Pineapple and
Vanilla. Sunflower, from Mexico and W North America, is the one of
world's largest oil crops. Major non-food crops of tropical American
origin include Rubber, Sea Island Cotton and Tobacco. Those of us who
grow kidney and lima beans, maize (corn), peppers, potatoes and sweet
potatoes, squashes and tomatoes are continuing the ancient gardening
tradition of the native American peoples.
Many popular plants of temperate gardens come from North America, both
annuals (California Poppy, Clarkia, Gaillardia or Blanket-Flower) and
perennials (Golden Rod, Michaelmas Daisy, Perennial Phlox). Garden
species of Cosmos, Dahlia, Tagetes ('French' and 'African' Marigolds)
and Zinnia come from Middle America. Tropical plants from the Americas
that have become cosmopolitan ornamentals include Bougainvillea, Datura
Almost all cacti (Cactaceae family) are restricted to the Americas. This
family of succulents contains 1650 species in 130 genera, mostly in hot,
dry desert habitats. Only Rhipsalis ('mistletoe cactus') extends to the
Soon after Colombus reached America in 1492, American plants began to
impact on the Old World, both as crops and weeds. Peppers (Capsicum),
immediately popular, were first mentioned in writing in 1493. Within a
century they had spread across Europe and the Portuguese had taken them
to Africa and India. Ironically, Colombus had sailed west in search of
the fabled spices of the East!