New York State Chemistry RegentsNew York State Earth Science Regents

 
Living Environment Regents August 2010 Question 08 PDF Print E-mail
Friday, 27 May 2011 12:18
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Correct answer: (2) cells and tissues

Each step represents the following embryonic stages of animals:

1-unicellular zygote

2, 3, and 4-multicellular cleavage

5-blastula formation

6-gastrulation

7-organogenesis

The initial stage of the embryogenesis is the zygote or the unicellular fertilized egg. This then undergoes several divisions forming tissues in a particular fashion until it reaches the 7th stage, the organogenesis, wherein the cells undergo differentiation to forms structures that will serve as the organs of the organism.

Incorrect answers:

(1) cells and organs

Cell is the basic unit of life. When cells aggregate for a specific function, it becomes a tissue. When tissues work together, these are now called organs. When the unicellular zygote divides, and the cells function together, it is then called a tissue.

(3) tissues and organelles

Tissues are collections of cells that work together for a specific function, while organelles are the membrane-enclosed parts of a cell. Though both of these structures are present in the stages illustrated, this answer is incorrect because cells must also be included in the structures present.

(4) organelles and cells

Organelles are parts of a cell with a specific function, while cells are the basic unit of life. The illustration exhibits stages wherein the cells are grouped together to form a specific task, thus, tissues are already present in those stages.
 

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