Organelles

Organelles are specialized structures within a cell that perform specific functions. Each organelle has a unique role in maintaining the cell's survival and carrying out its activities.

Nucleus

The nucleus is the control center of the cell. It contains genetic material (DNA) and directs the cell's activities.

Cell Membrane

The cell membrane is a protective barrier that surrounds the cell. It regulates what enters and exits the cell.

Endoplasmic Reticulum (ER)

The endoplasmic reticulum is involved in the production of proteins and lipids. It can be rough (with ribosomes) or smooth (without ribosomes).

Ribosomes

Ribosomes are the site of protein synthesis in the cell. They can be found attached to the rough ER or floating freely in the cytoplasm.

Golgi Apparatus

The Golgi apparatus processes, packages, and distributes proteins and lipids within the cell.

Mitochondria

Mitochondria are the powerhouses of the cell, producing energy in the form of ATP through cellular respiration.

Chloroplasts

Chloroplasts are found in plant cells and are involved in photosynthesis, converting light energy into chemical energy (glucose).

Vacuoles

Vacuoles store water, nutrients, and waste products. They are larger in plant cells than in animal cells.

Lysosomes

Lysosomes contain digestive enzymes and break down waste materials within the cell.

Cytoskeleton

The cytoskeleton provides structure and support to the cell, as well as facilitating cell movement and transport within the cell.

Study Guide

Here are some key points to remember about organelles:

The nucleus is the control center of the cell.
The cell membrane regulates what enters and exits the cell.
The endoplasmic reticulum is involved in protein and lipid production.
Ribosomes are the site of protein synthesis.
The Golgi apparatus processes and packages proteins and lipids.
Mitochondria are the powerhouses of the cell, producing energy.
Chloroplasts are found in plant cells and are involved in photosynthesis.
Vacuoles store water, nutrients, and waste products.
Lysosomes contain digestive enzymes and break down waste materials.
The cytoskeleton provides structure and support to the cell.

◂Science Worksheets and Study Guides Fourth Grade. Classifying organisms

Study Guide

Classifying organisms

Worksheet/Answer key

Classifying organisms

Worksheet/Answer key

Classifying organisms

Worksheet/Answer key

Classifying organisms

Vocabulary/Answer key

Classifying organisms

Vocabulary/Answer key

Classifying organisms

Vocabulary/Answer key

Classifying organisms

Vocabulary/Answer key

Classifying organisms

The resources above cover the following skills:

The Living Environment: Students understand that cells are the basic unit of life, that all life as we know it has evolved through genetic transfer and natural selection to create a great diversity of organisms, and that these organisms create interdependent webs through which matter and energy flow. Students understand similarities and differences between humans and other organisms and the interconnections of these interdependent webs.

Biodiversity: Students compare living things based on their behaviors, external features, and environmental needs.

Describe how living things can be sorted in many ways, depending on which features or behaviors are used to sort them, and apply this understanding to sort living things.