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Plant and Animal Cells Worksheets (Explanation and Worksheets)

Grade 6 Science Worksheets

Cell – The Basic Unit of Life

The cell is the most basic unit of life. All living things – all plants and all animals – are made up of many cells.

Most cells are extremely small and can only be viewed under a microscope. Some living things, such as bacteria, yeasts, amebae and algae, simply consist of one single cell (Unicellular) which is capable of carrying out all the functions of the living being. Plants and animals are made of millions and millions of cells (Multicellular), each set of cells specialized for a particular function. For example, the human body has muscle cells, nerve cells, cells that make up the heart, lungs, and other organs, and so on.

It is important to know the cell structure and main functions as cells come in all kinds of shapes and sizes. They typically have a Cell Membrane or Cell Wall around the outside which holds all the contents of the cell together. Put your knowledge to the test with this challenging 6th Grade Science Worksheet! Read each question carefully and choose the response that you feel is correct.

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Unicellular Organisms

Most unicellular organisms simply look like tiny balls. Other unicellular organisms, such as bacteria, resemble balls, rods and coils. Some may be shaped like boxes – square, round, oblong, triangular. The ameba has no particular shape at all!

Plant Cells

Most multicellular cells of plants are shaped like cubes or rectangles. Plant cells contain organelles known as Chloroplasts which contain a pigment called chlorophyll. Chlorophyll is essential for the process of photosynthesis in plants to produce energy-rich sugars. All life on earth depends on these sugars.

The cell walls of most plant cells are primarily made up of Cellulose fibers, which provide stiffness to the stems of plants. Doubts? A 6th-grade science tutor can help.

Structure of Plant Cell

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Structure of an Animal Cell

Animal Cells

Animal cells are generally smaller than plant cells. Multicellular animal cells have the greatest variety in shapes – they may be round, egg-shaped, square, or rectangular. Some muscle cells are long and thin, pointed at the ends. Some nerve cells are branched like trees.

The shape of a cell is related to the function that the cell needs to carry out. Long muscle cells can expand and contract to do work. After cell division, the animal cell almost retains its circular shape. Branched nerve cells can relay messages to all parts of the body.

The size of any multicellular plant or animal is determined by the total number of cells it has, and not the size of the cells. An elephant or a giant Sequoia tree has trillions of more cells than a mouse or a small bush, not because the cells are larger or smaller in size.

Check Point

  1. Which of these is multicellular?
    1. Bacteria
    2. Algae
    3. Giraffe
    4. Ameba
  2. Which of these is unicellular?
    1. Rose Plant
    2. Bacteria
    3. Cat
    4. Sequoia tree
  3. Plant cells are made up of structures known as ______ which contain ______ which is essential for the process of ______.
  4. Plant cells walls contain ______ to provide stiffness to stems.
  5. ______ cells are branched so that they can relay messages to all parts of the body.

Answer Key

  1. c) Giraffe
  2. b) Bacteria
  3. Chloroplasts, Chlorophyll, Photosynthesis
  4. Cellulose
  5. Nerve cells, also known as neurons
What is the main difference between plant and animal cells?

Plant cells have a rigid cell wall and chloroplasts, while animal cells lack cell walls and chloroplasts. Plant cells also typically have larger central vacuoles compared to animal cells.

How do plant and animal cells obtain energy?

Plant cells produce energy through photosynthesis, using sunlight, water, and carbon dioxide. Animal cells obtain energy by consuming organic matter through processes like respiration.

What are the key organelles found in both plant and animal cells?

Both plant and animal cells have common organelles such as the nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus, and ribosomes. These organelles perform essential functions related to cellular processes and metabolism.

Can plant and animal cells reproduce?

Yes, both plant and animal cells can reproduce. They undergo cell division, either through mitosis for growth and tissue repair or through meiosis for sexual reproduction.

Do plant and animal cells have specialized structures?

Yes, both types of cells have specialized structures. Plant cells have chloroplasts for photosynthesis and a cell wall for support. Animal cells may have structures like cilia or flagella for movement, and some cells can form tissues and organs for specific functions.

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