Here are the solutions to your biology worksheet.
I. Choose the correct option:
1)
a) Cell
*Reasoning:* The cell is the smallest unit that can perform all life processes, making it the basic structural and functional unit of an organism.
2)
a) Robert hooke
*Reasoning:* Robert Hooke was the first scientist to observe cells (in cork slices) in 1665 and coined the term "cell."
3)
a) Proteins and lipids
*Reasoning:* The plasma membrane (cell membrane) is primarily composed of a phospholipid bilayer with embedded proteins. This structure is often called the "fluid mosaic model."
4)
d) Amoeba
*Reasoning:* Humans, cats, and dogs are multicellular organisms made of many cells. An Amoeba is a single-celled (unicellular) organism.
5)
c) Virchow
*Reasoning:* Rudolf Virchow expanded on cell theory by stating *"Omnis cellula-e cellula,"* which means all cells arise from pre-existing cells.
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II. FILL IN THE BLANKS:
1)
Diffusion
*Reasoning:* Diffusion is the natural movement of particles from an area where they are crowded (high concentration) to an area where there is more space (low concentration).
2)
Plasma membrane (or
Cell membrane)
*Reasoning:* The outer boundary that encloses the cytoplasm of a cell is called the plasma membrane or cell membrane.
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Final Answer:
I. Choose the correct option:
1) a) Cell
2) a) Robert hooke
3) a) Proteins and lipids
4) d) Amoeba
5) c) Virchow
II. FILL IN THE BLANKS:
1) Diffusion
2) Plasma membrane (or Cell membrane)
Parent Tip: Review the logic above to help your child master the concept of 9th grade biology worksheet.
