Question

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Answer 1

Organs Organelles

Organs are part of the body. Organelles are part of the cells.

Found in multicellular organisms Found in all life – unicellular or multicellular

Organs collectively form organ systems Organelles contribute to form a cell.

Explanation:

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Answer 2

Answer:

i)

Organs

• Organs are part of the body.
• Found in multicellular organisms
• Organs collectively form organ systems
• Performs specific life process in the body.
• They are macroscopic in structure.
• Brain, Heart, Lungs, are a few examples of organs.

Organelles

• Organelles are part of the cells.
• Found in all life – unicellular or multicellular
• Organelles contribute to form a cell.
• Performs a specific process within the cell.
• They are microscopic in structure.
• Mitochondria, Nucleus, Golgi apparatus are a few examples of organelles.

ii)

Cell membrane

• Present in all types of cells, in humans, animals, plants, bacteria, etc.
• It is the outermost covering the animal cells
• It is a lipid bilayer. And is composed of lipoproteins and carbohydrates.
• The cell membrane is 7.5–10 nm in thickness
• It is a thin and delicate structure. It is flexible to change the shape as needed.

Cell Wall

• Present only in plants and in some fungi, bacteria, algae.
• It is the outermost part of the plant cell
• It is made up of pectin, chitin, lignin, glycoproteins, glycolipids, sugar, and cellulose.
• The cell wall is 0.1 μm to several μm in thickness
• It is the thick and rigid structure with a fixed shape.

iii)

Nucleus

• Large in size
• Bound by the nuclear envelope
• It contains chromosomes.
• It is rich in RNA

Nucleolus

• Very small in size
• It has no limiting membrane
• It does not hold any chromosomes
• It is rich in DNA, the genetic material

iv)

Leucoplast

• They are colourless plastids
• They do not contain pigments
• They are used to store starch, fat and proteins
• They have several nucleoids and uniform granular stroma

Chloroplast

• It is a plastid, typically green in colour
• They contain chlorophyll and other carotenoids
• They perform photosynthesis
• They contain lamellar system, ribosomes and thylakoids

Explanation:

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