Practice 2 - UIL 7th grade Science

Xylem and phloem are structures that transport materials within a plant.  The structures that enable the cells to function are:

• Short and hollow

• Short and compact

• Long and hollow

• Long and compact

Given the graphic below, what level of organization is best represented?

• Nucleus

• Cell

• Tissue

• Organ

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This body system’s main function is to provide protection.  It is comprised of skin, hair, and nails.  What best describes this system?

• Immune

• endocrine

• nervous

• integumentary

• Organisms respond to external stimuli to maintain homeostasis.  Shown is a lizard basking in the sun. The lizard responds to the stimuli by

• dehydration

• hibernating

• aestivating

• camouflage

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As technology has developed and scientists learn more about the structure and functions of the cell, the cell theory has been modified.  Which of the following is not a part of the modern cell theory?

• cells contain heredity information

• most organisms are made of cells

• all cells are the same chemical composition

• cells arise from other cells via cell reproduction

The mitochondria is most similar to which organ system?

• circulatory

• excretory

• nervous

• digestive

In animal cells, there are several small structures as shown.  They store nutrients, water, and waste from the cell.  This best describes which of the following organelles?

• vacuole

• mitochondria

• endoplasmic reticulum

• nucleons

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What determines the biological sex of a human?

• Presence of a X or Y chromosome

• Presence of the 21st chromosome

• Codominance

• Presence of the 47th chromosome

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Elephants migrate during the dry season as a herd.  This response is due to:

• organism

• species

• community

• population

Mutations occur in organisms.  Which of the following is a harmful mutation?

• Sickle cell anemia

• increase bone density in humans

• Nylonase in bacteria

• Murry Gray cattle in Australia

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