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Science [3 Marks Question]

T2 CH4 Cell Biology · Tamil Nadu Board STD 7 (Tamil - English Medium). 3 questions.

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[3 Marks Question]

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Question 13 Marks
On the lines given below, write about what you have learned from the activities done in this lesson.
Let me tell you about some of the important things I’ve learned about cells. First, I’ll start with…______
Answer
  1. Cell is the basic unit of an organisms.
  2. Based on number of cells organisms can be classified as unicellular and multicellular organisms.
  3. The cells form tissues, Tissues form organs, Organ system help an organism to function.
  4. The cell wall is seen only in plant cells.
  5. Cell membrane is seen only in plant cells.
  6. Cell membrane is seen in all cells.
  7. The organelles of the cell like chloroplast, Mitochondria, Ribosomes, Endoplasmic Reticulum, Golgi bodies etc help to perform cell functions.
  8. Nucleus is the controlling centre of a cell.
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Question 23 Marks
Write a short note on nucleus
Answer
  • Nucleus
  1. Nucleus is seen in the cytoplasm of plant and Animal cells.
  2. It is surrounded by nuclear envelope.
  3. It has one or two nucleoli and chromatin body.
  4. The chromatin body stores genetic information.
  • Functions of Nucleus:
  1. It controls all the processes and chemical reactions that take place inside the cell.
  2. Inheritance of character from one generation to another.
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Question 33 Marks
Distinguish between the following pairs Smooth ER and Rough ER Cell wall and cell membrane Chloroplast and mitochondria.
Answer
  • Smooth ER (Endoplasmic Reticulum)
  1. It is smooth due to absence of Ribosomes.
  2. It helps in transport of steroids and lipids.
  • Rough ER (Endoplasmic Reticulum)
  1. It is’rough due to presence of Ribosomes.
  2. It helps in protein synthesis
  • Cell wall
  1. It is seen only in plant cells.
  2. It is made of cellulose.
  • Cell membrane
  1. It is seen in plant and animal cells.
  2. It is made of proteins and lipids.
  • Chloroplast
  1. It is a organelle seen only in plant cells (green plants)
  2. It helps in synthesis and storage of starch.
  • Mitochondria
  1. It is a organelle seen in plant and animal cells.
  2. It is the centre of respiration in a cell and produces energy.
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[3 Marks Question] - Science STD 7 Questions - Vidyadip