Download A Closer Look at Bacteria, Algae, and Protozoa (Introduction by Sherman Hollar PDF

By Sherman Hollar

Micro organism, algae, and protozoamicroorganisms which are simply neglected in our day-by-day livescan be present in a large choice of destinations and serve innumerable ecological reasons. whereas a few such organisms were linked to illness, they've got additionally been important in agriculture and within the construction of definite meals, drugs, and different must haves. This informative quantity examines the houses and makes use of of those robust and crucial existence kinds. image organizers and unique photos carry the miniscule info of those entities to the leading edge.

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Additional resources for A Closer Look at Bacteria, Algae, and Protozoa (Introduction to Biology)

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Some species, such as Ulva, or sea lettuce, are consumed by humans. A species of yellow-green alga called Vaucheria sessilis is an example of a sexually reproducing alga. The reproductive structures consist of an antheridium, which contains male gametes (sex cells), and two oogonia, which contain female gametes. Robert W. Hoshaw/EB Inc. 60 feAtures And tyPes of AlgAe However, green algae can also pose problems. Under certain environmental conditions, they may undergo rapid and uncontrolled reproduction.

Sometimes they bud all around the sides and form mats or long chains of cells called filaments. Some of these filaments and mats float onto rocks in quiet places where the motion of the water is not strong enough to carry them off again. These filaments cling to the surface while the floating cells wave in the water, gather the food, bud, and spread into feathery, leaflike fronds. The portion that clings to the rocks or other substrate is called a holdfast. Some species of multicellular algae reproduce by means of spores—tiny collections of reproductive tissue that form on the alga’s surface and are washed away by the water.

These filaments cling to the surface while the floating cells wave in the water, gather the food, bud, and spread into feathery, leaflike fronds. The portion that clings to the rocks or other substrate is called a holdfast. Some species of multicellular algae reproduce by means of spores—tiny collections of reproductive tissue that form on the alga’s surface and are washed away by the water. When the spores ripen, they are washed off. These free-floating bodies then develop into adult cells. A number of the larger algae species can undergo sexual reproduction.

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