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Definition

Active transport

The movement of molecules from an area of lower concentration to the area of a higher concentration, with the expenditure of energy

Definition

Cell

The structural and functional unit of life. 

Definition

Cell membrane

A thin and elastic membrane covering the cytoplasm of all prokaryotic and eukaryotic cells 

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Definition

Cell theory

One of the most fundamental education about cells, proposed by Schleiden and Schwann 

Definition

Cell wall

The non-living and strong component of the cell, located outside the cell membrane, in plants, fungi, prokaryotes, and many protists 

Definition

Centriole

The hollow and cylindrical organelles present in the cells of animals and many unicellular organisms 

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Definition

Chloroplast

The green plastids found in plants and many protists; involved in photosynthesis

Definition

Chromoplast

The plastids with pigments of bright colors: are present in flower petals, fruits, etc. 

Definition

Connective tissue

Animal tissue that supports and binds other tissues 

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Definition

Cytoplasm

The semi-viscous and semi-transparent substance present between the plasma membrane and the nuclear envelope

Definition

Diffusion

The movement of molecules from an area of their higher concentration to the area of lower concentration 

Definition

Endoplasmic reticulum

The network of channels that extends from plasma membrane to the nuclear envelope

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Definition

Epithelial tissue

Animal tissue that covers the outside of the body and lines organs and cavities 

Definition

Facilitated diffusion

The movement of the molecules from higher to lower concentration with the help of transport proteins 

Definition

Golgi apparatus

The set of flattened sac-like structures called cisternae; found in animal and plant cells; are involved in cell secretions 

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Definition

Hypertonic solution

The solution in which more solute is present 

Definition

Hypotonic solution

The solution in which less solute is present 

Definition

Isotonic solution

The solutions, which have equal concentrations of solutes 

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Definition

Leucoplast

The colorless plastids in the cells of those plant parts where food is stored

Definition

Lysosome

The single-membrane bound organelles have strong digestive enzymes

Definition

Mitochondrion

The double membrane-bounded structure in eukaryotes; is involved in cellular respiration 

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Definition

Muscle tissue

Animal tissue is composed of cells with the ability to contract 

Definition

Nucleus

The most prominent organelle in the eukaryotic cells; controls all cell activities 

Definition

Osmosis

The movement of water molecules from a solution of lesser solute concentration to a solution of higher solute concentration, across a semi-permeable membrane

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Definition

Organelle

Microscopic structure which does a particular job in a cell, e.g. the nucleus.

Definition

Passive transport

The movement of materials without any expenditure of energy

Definition

Phagocytosis

The phenomenon in which cell takes in solid materials in bulk

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Definition

Pinocytosis

The phenomenon in which a cell takes in liquid materials in drops 

Definition

Plasmolysis

The shrinking of cell due to loss of water 

Definition

Plastid

The membrane-bound organelles in plants and many protists 

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Definition

Ribosome

Tiny granular structures in the cells; either floating freely in the cytoplasm or bound to the endoplasmic reticulum, involved in protein synthesis 

Definition

Semi-permeable

The structure that allows a very few molecules to cross it and checks the majority of molecules to cross 

Definition

Turgor pressure

The pressure of the internal water on cell wall 

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Definition

Tissue

Group of cells of the same type doing a particular job, e.g. the glandular tissue, muscular tissue, nervous tissue etc

Definition

Microfilament

Part of the cytoskeleton; made of actin proteins 

Definition

Microtubule

Part of the cytoskeleton; made of tubulin proteins

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Definition

Vacuole

A fluid-filled organelle, bounded by a single membrane

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