Grade 8 Science - Chapter 1.1: Cells, Tissues, Organs, and Systems

Fill-in-the-blank practice flashcards covering Chapter 1.1 of Grade 8 Science, focusing on the characteristics of living things, cell theory, plant and animal systems, and design challenge models.

All plants and animals, dead or alive, are made of __________.

cells

In animal bodies, cells are organized into tissues, organs, and __________.

organ systems

Plants must be able to gather water and transport it to their __________ to survive.

leaves

Scientists and technologists use artificial cells as models of real cells to understand how __________ work together.

human cells

A network of blood vessels, thousands of __________ long, carries a living fluid throughout the human body.

kilometres

The driving force that circulates blood is the heart, beating continuously over __________ times a year.

$$40\text{ million}$$

Living things are often referred to as __________.

organisms

Before any entity can be classified as an organism, it must show __________ of the characteristics of living things.

all

Although a volcano can move, increase in size, and release gases, it is not alive because it does not possess all characteristics of an __________.

organism

As a characteristic of life, cells reproduce by __________, providing new cells needed for growth and repair.

dividing in two

Plants obtain the energy they require directly from the __________.

Sun

Living things have a life span, which means they exist for only a __________ period of time.

limited

Living things produce wastes; for example, human kidneys filter wastes from the __________.

blood

The first major point of the cell theory is that all living things are composed of __________.

cells

The second major point of the cell theory states that all cells come from __________ cells.

pre-existing

A plant bending toward light demonstrates the characteristic that living things respond to the __________.

environment

Human lungs exhaling carbon dioxide demonstrates the characteristic that living things produce __________.

wastes