Al Rowad International School
Boys section
Science Department (7-12)
School year 2021 – 2022
Subject: Biology
Student Name:
Grade: 7
Date:
Revision Worksheet (L1.3)
Obtaining and removing materials
I)
Fill in the blanks with the correct word.
1. Cells rely on the movement of surrounding gases, liquids, and
particles to supply them with nutrients and materials.
2. ______________, ____________and _______________must be
able to move into a cell.
3. ____________________ must move out.
4. Every cell is surrounded by a ______________that lets substances
in and out.
5. Maintaining a stable internal environment is called Homeostasis
6. Phospholipids, cholesterol and glycolipids are important molecules that
make up the structure of the cell membrane.
7. The cell membrane is __________________, because some
substances can cross the membrane, while others can’t.
8. The movement of dissolved materials across a cell membrane
without using the cell’s energy is called ____________________.
9. ______________________ is the process by which molecules
move from an area of higher concentration to an area of lower
concentration.
10. Insects use _______________ instead of lungs to diffuse
oxygen into their cells.
11. The diffusion of water molecules across a selectively permeable
membrane is called ____________________.
12. In a process called _________________, proteins in the cell
membrane form channels through which the __________________
can pass.
13.
Facilitated diffusion is a form of _______________________.
Al Rowad International School
Boys section
14.
Science Department (7-12)
School year 2021 – 2022
_______________________ is the movement of materials
across a cell membrane using cellular energy.
15. ____________, _____________and _____________are some
substances that are carried into and out of the cells by active
transport.
16. _______________ and _______________ are forms of active
transport that require energy from the cell to move large particles.
17. Amoebas extend their cell membrane around a food particle or
prey organism. Then, they bring the food into the cell.
They use the process of _____________________ to get the food
inside the cell.
18.
In the process of Exocytosis, ________________ carrying
large particles of waste move toward the _________________,
then it fuses with membrane in order to push the waste particles
___________ of the cell.