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Your Progress - Chapter 50% complete
1I. Choose the correct answer:5 questions
Q.1The unit of measurement used for expressing dimension (size) of cell isv
- A. centimeter
- B. millimeter
- C. micrometer
- D. meter
Q.2Under the microscope, Priya observes a cell that has a cell wall and a distinct nucleus. The cell that she observed isv
- A. a plant cell
- B. an animal cell
- C. a nerve cell
- D. a bacteria cell
Answer:(d) a bacteria cell
Q.3A ‘control centre’ of the eukaryotic cell isv
- A. Cell wall
- B. Nucleus
- C. Vacuoles
- D. Chloroplast
Q.4Which one of the following is not a unicellular organism?v
- A. Yeast
- B. Amoeba
- C. Spirogyra
- D. Bacteria
Q.5Most organelles in a eukaryotic cell are found in thev
- A. Cell wall
- B. cytoplasm
- C. nucleus
- D. Vacuole
2II. Fill in the Blanks1 questions
Q.G1The instrument used to observe the cell is ……….. I control the food production of a cell. Who am I? ……….. I am like a policeman. Who am I ………? The Term “cell” was coined by ……….. The egg of an Ostrich is the ……….. single cell.v
Answer:Microscope
Chloroplast
Cell membrane
Robert Hooke
Largest
3III. True or False. If False, give the correct answer.1 questions
Q.G2A cell is the smallest unit of life. Nerve cell is the longest cell Prokaryotes were the first form of life on earth. The organelles of both plants and animals are made up of cells. (Organelles – Found inside the cell) New cells are produced from existing cells.v
Answer:True
True
True
False
True
4V. Arrange in a correct sequence2 questions
Q.1Elephant, Cow, Bacteria, Mango, Rose plant.v
Answer:Bacteria, Mango, Rose plant, Cow, Elephant.
Q.2Hen Egg, Ostrich egg, Insect egg.v
Answer:Insect egg, Hen egg, Ostrich egg
5VI. Analogy1 questions
Q.G3Prokaryote : Bacteria :: Eukaryote : ……….. Spirogyra : Plant cell :: Amoeba : …………. Food producer : Chloroplasts :: Power house : …………v
Answer:Plants, Animals
Animal cell
Mitochondria
6VII. Give a Very short answer:7 questions
Q.1Who discovered the cell in 1665?v
Answer:The English scientist Robert Hooke discovered the cell in 1665 from cork slices kept under a microscope.
Q.2What type of cells do we have?v
Answer:We have a Eukaryotic type of cells.
Q.3What are the essential components of a cell?v
Answer:A typical cell consists of three major parts.
An outer cell membrane
A liquid cytoplasm
Nucleus
Q.4What are the organelles found only in plant cells?v
Answer:Cell wall
Chloroplast
Q.5Give any three examples of eukaryotic cells.v
Answer:Plant cells
Animal cells
Most of fungi and Algae
Q.6Which one is called as “Area of movement”?v
Answer:The cytoplasm is a watery, gel-like material in which cell parts move. So it is known as an “Area of movement”.
Q.7Shiva said, “Bigger onion has larger cells when compared to the cells of the smaller onion”! Do you agree with his statement or not? Explain why?v
Answer:No, the big onion and small onion both of them have plant cell and the size of every cell remains the same whether it is of a small onion or big one. The shape is larger means that the number of cells is more in bigger onion.
7VIII. Give a short answer:4 questions
Q.1Why cells are called building blocks of life?v
Answer:A brick is a basic building block of a wall, likewise, the cells are the basic structural and functional unit of every living organism. So the cells are called as building blocks of life.
Q.3Distinguish between prokaryotic and eukaryotic cellsv
Q.4Make sketches of animal and plant cells which you observe under the microscope.v
Answer:Cell Wall & Chloroplasts – Absent in Animal Cells
Centrioles – Absent in Plant Cells
Q.5Write about the contribution of Robert Hooke in cell biologyv
Answer:Robert Hooke was a scientist and inventor. He improved the microscope and built a compound microscope. One day he made thin sections of the cork and observed many small identical chambers through his microscope. They were hexagonal in shape. Based on these observations Hooke published a book named Micrographia in the year 1665, where he first used the term Cell. He describes the structure of tissue using the term cell.
8IX. Answer in detail:2 questions
Q.1Tabulate any five cell organelles and their function.v
Q.2Draw a neat labelled diagram of a prokaryotic cell.v
9I. Choose the right answer:3 questions
Q.1The first cell formed in the earthv
- A. Eukaryotic cell
- B. Algal cell
- C. Fungal cell
- D. Prokaryotic cell
Answer:(d) Prokaryotic cell
Q.2Robert Hooke published a book named ______ in the year 1665.v
- A. Cellula
- B. Micrographia
- C. Cell biology
- D. Organelles
Q.4The largest cell is the egg of an ______ with 170-millimeter width.v
- A. Ostrich
- B. viper
- C. tortoise
- D. Hen
10II. Assertion and Reason2 questions
Q.1Assertion (A) : Chloroplast is a cell organelle Reason (R) : An organelle is a distinct part of the cell which has a particular structure and Function.v
- A. Assertion (A) and Reason R – True and R is the correct explanation of A
- B. Both A and R – true but R is not the correct explanation of A
- C. A True but R False
- D. A False but R True
Answer:(a) Assertion (A) and Reason R – True and R is the correct explanation of A
Q.2Assertion (A) : Mitochondria is an important organ cell of the cell Reason (R) : Mitochondria is involved in food preparationv
- A. Assertion (A) and Reason R – True and R is the correct explanation of A
- B. Both A and R – true but R is not the correct explanation of A
- C. A True but R False
- D. A False but R True
Answer:(c) A True but R False