Unitary and Modular Organisms: Their Response to Environmental Changes and Perturbation1

5566 Words Sep 19th, 2012 23 Pages
Unitary and Modular Organisms: Their Response to
Environmental Changes and Perturbation1

Casey Jon Vea
Group 3 Section U-2L

August 3, 2011

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1A scientific paper submitted in partial fulfillment of the requirements in Biology 150, Principles of Ecology laboratory under Mrs. Charina Grace B. Banaay , Ist semester 2011-2012
Abstract
Every individuals or organisms dwell in a place where well suited for their growth and development, survival and reproduction. When changes happened to their environment expected changes will also be observed and adaptation mechanisms are produced. This study focuses on the responses of modular and solitary organisms under their normal environmental condition
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This exercise uses the two kinds of organism namely unitary and modular. Modular organisms are characterized by indeterminate and unpredictable growth and development. While, unitary organisms, on the other hand are organisms that have highly determinate forms governed by their genetic make-up. Their growth patterns from fertilization to maturity until death are continuous and predictable. The responses of modular organisms, specifically plants, to changes in environment were observed. Two sets composed of two plants each were observed. The sun-loving plants, Alternanthera and Cyperus and the shade-tolerated plants, Zebrina and Talinum, are used as experimental species of each categories of plant environment.
Althernanthera reaches a height of 5 to 15 inches and grows lowly. Alternanthera needs plenty of light to grow and form dark leaves. In open aquariums it grows willingly up the surface, and like other difficult plants growth improves considerably if CO2 is added
Cyperus is a species of sedge native to Africa, southern and central Europe and southern Asia. It is a perennial plant that may reach a height of up to 40 cm. Cyperus is one of the most invasive weeds known, because it’s a tough competitor for ground nutrients and it releases substances harmful to other plants. The underground tubers caused the problem because of its intensive system and resistance to herbicides. On the other hand, it has a lot of uses, despite its bad reputation it has benefits