cells tissues and organs
protozoa only has 1 cell
the cell of protozoa has to do everything that the protozoa needs to live
animals and plants have many cells
different cells take on different tasks
every cell is specialized to do a particular function
red blood cells carry oxygen to the body
nerve cells transfer messages trough the body
root hair cells grow from the top layer of the root
a group of cells that do a particular function is called a tissue
we can only see protozoa clearly under a microscope
the human body is made of tissue
protozoa dont have tissue because they are single celled
plant root cell absorbs water from the soil
each organ in animals or plant usually have several tissues
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🦠 1. Protozoa – Single-Celled Organisms
Protozoa have only one cell.
The single cell of a protozoa performs all the functions needed for it to live — eating, moving, and reproducing.
Protozoa are so small that we can see them clearly only under a microscope.
Because they have just one cell, protozoa do not have tissues.
🧫 2. Multicellular Organisms – Plants and Animals
Plants and animals have many cells.
In multicellular organisms, different cells perform different tasks.
Each cell is specialized to do a particular function that helps the organism survive.
🔬 3. Specialized Cells and Their Functions
Here are some examples of specialized cells and their roles:
Red blood cells – carry oxygen to all parts of the body.
Nerve cells – transfer messages throughout the body.
Root hair cells – grow from the outer layer of the root and absorb water from the soil.
Plant root cells – help take in water and minerals from the soil to support the plant.
🧩 4. Tissues – Groups of Similar Cells
A tissue is a group of cells that perform the same function.
Example: Muscle tissue helps in movement.
The human body is made up of many different tissues.
Protozoa don’t have tissues because they are single-celled, but plants and animals do.
🫀 5. Organs – Groups of Tissues
Organs are formed when different tissues work together to perform a special job.
Example:
In humans, the heart pumps blood.
In plants, roots, stems, and leaves are organs that perform specific functions.
Each organ in animals or plants usually has several types of tissues.