7th Standard Syllabus & Materials

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TN 7th Tamil பருவம் -1 இயல் 1 - அமுதத்தமிழ் - ஒன்றல்ல இரண்டல்ல Important Questions And Answers Study Material - QB365 Set A

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TN 7th Tamil பருவம் -1 இயல் 1 - அமுதத்தமிழ் - எங்கள் தமிழ் Important Questions And Answers Study Material - QB365 Set A

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TN 7th English T1 - Prose - A Prayer to the Teacher Important Questions And Answers Study Material - QB365 Set A

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TN 7th English T1 - Poem - The Listeners Important Questions And Answers Study Material - QB365 Set A

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7th Standard English Medium Science Subject T2 - Cell Biology Book Back 3 Mark Questions with Solution Part - I

Published on: 16/06/2021

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Std: 7th Standard - Science

chapter: - Book back Questions

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Questions:

Generic 3

4 x 3 = 12

Write a short note on nucleus.

Write correct sequence from cell to organism?

Distinguish between the following pairs Smooth ER and Rough ER Cell wall and cell membrane Chloroplast and mitochondria

Why the cell is very important for us?

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Answers Key:

Generic 3

4 x 3 = 12

Plant and animal cells have a nucleus inside the cytoplasm. It is surrounded by a nuclear envelope. One or two nucleolus and the chromatin body are present inside the nucleus. During cell division the chromatin body is organised in a chromosome

Cell, tissue, organ, organ system, organism

Smooth ER and Rough ER

S.No	Smooth ER	Rough ER
1.	It is a network of tubular sacs without ribosomes on the membrane.	It is a network of tubular sacs with ribosomes on the memebrane.
2.	They play a role in the synthesis of lipids steroids.	It helps in synthesis of protein.

Cell wall and Cell membrane

S.No	Cell wall	Cell membrane
1.	It is present in plant cell.	It is present in animal cell
2.	It is made up of cellulose	It is made up of protein and lipids.

Chloroplast and Mitochondria

S.No	Chloroplast	Mitochondria
1.	It is found in only plant cell.	It is present in both plant and animal cell.
2.	It is a food producer.	It is the powerhouse of the cell.

The building wall is made up of numerous bricks. In similar manner, all living organisms made up of cell. Cell is the fundamental life of organism. So cell is very important for us.