Diversity in Cells

Q. Do you agree that “A cell is the building unit of an organism”. If yes, explain why?

Q. A human nerve cell is _______ long.

1. 90 to 100 cm
2. 20 to 100 cm
3. 190 to 200 cm
4. 90 to 150 cm

Q. Majority of cells cannot be seen directly with our naked eyes because-

1. Organisms are generally unicellular.
2. Most of the cells are microscopic.
3. Most of the cells do not contain nucleus.
4. Cells are grouped into tissues.

Q.

What happens, when RBCs are placed in hypotonic solution

Q.

Which of the following cell can change its shape in the human body?

1. Brain cell

2. WBC

3. Kidney cell

4. RBC

Q. Select the incorrect statement about cells.

1. They are of different shapes and sizes.
2. They are of same shape and size.
3. Our body is made up of cells.
4. From organism to organism, the count of cells may vary.

Q.

Single-celled organisms are called____.

Q.

Choose the correct statement with respect to unicellular organisms:

1. in unicellular organisms, tissues work in co-ordination to perform different functions.

2. unicellular organisms do not require food.

3. unicellular organisms respire and reproduce.

4. all unicellular organisms move by cilia.

Q. I am a unicellular organism. I am shapeless but I do have a well-defined nucleus. Who am I?

1. Amoeba
2. E. coli
3. Cyanobacteria
4. Chlamydomonas

Q. Which of the following are the examples of unicellular organisms?

1. Amoeba
2. Spirogyra
3. Paramoecium
4. Chlamydomonas

Q. Which of the following is not a unicellular organism?

1. Amoeba
2. Paramoecium
3. Mushroom
4. Spirogyra

Q.

Why study of cells are largely dependent on microscope ??

Q.

What can you conclude from the given figure?

Q. Question 2
Majority of cells cannot be seen directly with our naked eyes because:

(a) organisms are generally unicellular
(b) cells are microscopic
(c) cells are present only inside the body
(d) cells are grouped into tissues

Q. The jelly-like fluid substance present in cells is called _________________.

1. mitochondria
2. chloroplast
3. chromosome
4. cytoplasm

Q.

Is the cell regular or irregular in shape? If not, does is depend on its function.

Q. Question 6
State the difference between eukaryotes and prokaryotes.

Q. What are the lower levels of organization in a multicellular organism? Are these levels also present in unicellular organisms?

Q.

From the following figures, find the unicellular organisms.

1. (ii) and (iii)

2. (i) and (iii)

3. (i) and (ii)

4. (i), (ii) and (iii)

Q. Which of these unicellular organisms has no definite shape?
(a) Amoeba
(b) Paramecium
(c) Euglena
(d) bacteria

Q.
Which of the given labelled parts of the above figure, constitute the living substances of the cell?

उपरोक्त चित्र के दिये गये कौनसे नामांकित भाग कोशिका के जीवित पदार्थों का निर्माण करते हैं?

1. P and S
   P व S
2. Q and R
   Q व R
3. P and R
   P व R
4. R and S
   R व S

Q.

Given below are the components required to observe the structure of cells. Find the correct component matched with the correct function.

1. Microscope - Magnification of the cell structure

2. Both A and B

3. Either A or B

4. Stains - Colouring the parts of cell to study the detailed structure

Q.

Which of the following is an example of single cell which can change its shape?

1. WBC

2. Nerve cell

3. None of the given options

4. Tissue

Q. Question 16
Identify the statement which is true for cells.

(a) Cells can be easily seen with naked eyes.
(b) Insect’s egg is not a cell.
(c) A single cell can perform all the functions in a unicellular organism.
(d) The size and shape of cells is uniform in multicellular organisms

Q.

‘Cells are the basic structural units of living organisms’. Mention three points in favour. [3 MARKS]

Q. Assertion :Amoeba contains a contractile vacuole. Reason: It helps in both digestion and osmoregulation.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

Q.

Amoeba and Paramecium belong to which category of organisms?

Q. The jelly-like fluid substance present in cells is called _________________.

1. mitochondria
2. chloroplast
3. chromosome
4. cytoplasm

Q. Protoplasm was regarded as the "physical basis of life" by

1. Hardy (1899)
2. Malphighi (1903)
3. Corti (1772)
4. Huxley (1868)

Q.

Are bacteria considered alive?