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ILTS Middle Grades Science (203) Practice Tests & Test Prep by Exam Edge


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ILTS Middle Grades (5-8) Science Sample Test

1 of 5

Of the following cell parts, which only exists within a plant cell?





Correct Answer:
cell wall


of the options given—mitochondrion, cell wall, nucleus, and cytoplasm—the component that only exists within a plant cell is the cell wall, making (b) the correct answer. to understand why this is the case, it's important to delve into the roles and characteristics of each of these cellular components.

first, let's consider mitochondria, which are present in both plant and animal cells. mitochondria are often referred to as the "powerhouses" of the cell because they generate most of the cell's supply of adenosine triphosphate (atp), used as a source of chemical energy. they are involved in other important processes such as cell signaling, cellular differentiation, and cell death, as well as maintaining control of the cell cycle and cell growth.

the nucleus is another cellular component found in both plant and animal cells. it acts as the command center of the cell, housing genetic material in the form of dna. the nucleus controls cellular activities by directing protein synthesis and regulating cell growth and reproduction by passing on genetic information to new cells.

the cytoplasm is a thick solution that fills each cell and is enclosed by the cell membrane. it is composed mainly of water, salts, and proteins. in both animal and plant cells, the cytoplasm holds all the organelles outside of the nucleus and provides the medium in which cellular processes, including metabolic pathways, occur.

finally, the cell wall is the distinguishing feature of plant cells that is not present in animal cells. the cell wall is a rigid layer that lies outside the cell membrane. its primary function is to give the cell strength and structure and to filter molecules that pass in and out of the cell. it is mainly composed of cellulose, a complex sugar. the cell wall is crucial for a plant's ability to stand upright and reach toward sunlight, and it also plays a protective role, safeguarding the cell from mechanical stress and infectious agents.

in summary, while mitochondria, nuclei, and cytoplasm are common to both plant and animal cells, the cell wall is unique to plant cells. its presence in plant cells is critical for structure, protection, and maintaining the integrity of the cell in the various environments plants typically inhabit.


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ILTS Middle Grades (5-8) Science Aliases Test Name

Here is a list of alternative names used for this exam.

  • ILTS Middle Grades (5-8) Science
  • ILTS Middle Grades (5-8) Science test
  • ILTS Middle Grades (5-8) Science Certification Test
  • ILTS Middle Grades Science test
  • ILTS
  • ILTS 203
  • 203 test
  • ILTS Middle Grades (5-8) Science (203)
  • Middle Grades (5-8) Science certification