Unicellular and Multicellular Organisms Quiz

Cellular Organisms

• Unicellular organisms are made up of a single cell, e.g., Amoeba, paramecium.
• Multicellular organisms are made up of more than one cell, e.g., human beings, plants, animals.

Amoeba

• Amoeba has pseudopodia (false feet) that facilitate movement and help in capturing food.

Nerve Cells

• Nerve cells help in transferring messages from various body parts to the brain and from the brain to various parts of the body.
• They also help in coordinating the functions of the organs in the body.

Cellular Structure

• Cytoplasm is a jelly-like substance between the nucleus and cell membrane, made up of carbohydrates, proteins, and water.
• Nucleus is spherical in shape, located in the center of the cell, and contains genetic material like RNA and DNA.

Cell Functions

• Cells are the basic structural units of living organisms.
• Cells contain all the necessary structures required to carry out various biological processes.
• A group of cells makes a tissue, which further makes organs and finally an organism.

Cell Types

• Eukaryotes have a well-defined nucleus and organelles covered with membranes, e.g., plant cells, animal cells.
• Prokaryotes do not have a well-defined nucleus and nuclear membrane, e.g., bacteria, blue-green algae.

Chromosomes

• Chromosomes are thread-like structures found in the nucleus of a cell.
• Chromosomes carry genes and help in the transfer of characters from parents to the offspring.

Plant Cells

• Plant cells have an additional layer surrounding the cell membrane called the cell wall, which provides protection, shape, and support.
• Chloroplasts are found only in plant cells and contain chlorophyll, which plays a role in photosynthesis.