Question

A lab activity: to observe the peels cell of onion

Answer 1

Aim - To observe nucleus in onion peel cell

Materials required - Onion peel , stain ( saffrain , methylene blue or red ink ) , slide , cover slip , filter paper and microscope

Procedure -

• Take a small fleshy portion of onion bulb and break it into pieces to obtain the thin translucent membrane
• Now keep the membrane on the slide and add a drop of saffrain or methylene blue for staining
• Cover the cover slip and leave it for few minutes
• Add few drops of water from one side of cover slip such that extra stain is washed away
• Use filter paper for soaking extra water
• Observe under microscope

Observation - A dark spot can be observed towards the periphery which is nucleus . Thick boundry of cell called as cell wall is also visible

Inference - Onion peel consists of dense round body called nucleus

Precautions - Tap the cover slip to remove air bubbles

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Answer 2

$\huge{\underline{\bigstar{\mathfrak{Answer!!}}}}$

${\underline{\star{\sf{Aim :}}}}$

To observe the cells of onion peel

${\underline{\star{\sf{Materials :}}}}$

Onion peel, slide, glycerine,

microscope

${\underline{\star{\sf{procedure:}}}}$

➜Take an onion peel

➜Now place it on slide

➜Put a drop of water and then a drop of glycerine on it.

➜Gently cover it with a cover slip.

➜Observe it under the microscope.

${\underline{\star{\sf{Observation:}}}}$

Rectangular shaped cells are observed the microscope.

${\underline{\star{\sf{Conclusion : }}}}$

Onion peel cells are observed under the microscope.