Cell - Structure and Functions Worksheet-7

Cell - Structure and Functions Worksheet-7

1. Which of the following is true about plant cells?

(a) They always have a secondary cell wall and the primary may disappear

(b) They have channels between cells that allow strands of cytoplasm to pass from cell to cell

(c) They develop turgor pressure when water enters the nucleus

(d) They do not have cell-to-cell junctions like animal cells.

2. Which of the following is incorrect regarding genes?

(i) they control the transfer of hereditary characteristics.

(ii) nucleolus carry genes.

(iii) they are part of chromosome.

(iv) they are found only in the nucleus.

(a) (iii) & (iv)    (b) (iii) only       (c) (i) only         (d) (ii) & (iv)

3. Plant cells can usually be distinguished from animal cells because only plant cells possess

(a) Mitochondria and lysosomes

(b) Chromosomes and lysosomes

(c) Chloroplast and cell wall

(d) Chloroplast and Golgi complex.

4. Which of the following is not a characteristic of a eukaryotic plant cell?

(a) Annuli associated with nuclear envelope

(b) Centrosomes with centrioles

(c) Thylakoids inside the chloroplasts

(d) Ribosomes associated with endoplasmic reticulum.

5. Read the given statements and select the correct option.

Statement 1 : Fungi are typical eukaryotic plant cells with exception.

Statement 2 : All their members are achlorophyllous.

(a) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1

(b) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1

(c) Statement 1 is true and statement 2 is false

(d) Both statements 1 and 2 are false.

6. Give the correct order of the procedures listed below to prepare a specimen for microscopic examination.

(a) Embedding, rehydration, dehydration, mounting, fixation, staining, sectioning

(b) Embedding, dehydration, rehydration, mounting, fixation, staining, sectioning

(c) Fixation, dehydration, embedding, sectioning, staining, mounting, rehydration

(d) Fixation, dehydration, embedding, sectioning, rehydration, staining, mounting.

7. "Cells are basic structural units of living organisms." It is called so because

(a) Cells exhibit a variety of shapes and sizes

(b) Number of cells varies from organism to organism

(c) The smallest living part of an organism is cell

(d) Cells were first observed in cork by Robert Hooke in 1665.

8. Which of the following is incorrect about the given figures?

(a) Both are unicellular eukaryotic organisms

(b) 'a' is unicellular, while 'b' is multicellular organism

(c) Both are capable of independent existence

(d) 'a' is unicellular, while 'b' is multicellular organism & Both are capable of independent existence

9. Refer the given figure and select the incorrect option.

(i)     The part labelled 'P' is found in plant cell only.

(ii)   The part labelled 'Q' is a green coloured plastid.

(iii)  The part labelled 'R' is the controlling centre.

(iv)  The part labelled 'R' gets its shape from part labelled 'P'.

(a) (iv) only       (b) (i) & (iv)      (c) (ii) & (iii)     (d) (iii) only.

10. Ultra structure of a cell organelle can best be studied through

(a) Microdissection

(b) Electron microscope

(c) Phase-contrast microscope

(d) Autoradiography.

11. Which is correct about cell theory in view of current status of our knowledge about cell structure?

(a) It needs modification due to discovery of subcellular structures like chloroplasts and mitochondria

(b) Modified cell theory means that all living beings are composed of cells capable of reproducing

(c) Cell theory does not hold good because all living beings (e.g., viruses) do not have cellular organisation

(d) Cell theory means that all living objects consist of cells whether or not capable of reproducing.

12. A plant cell has potential to develop into full plant. This property is called

(a) Tissue culture                         (b) Pleuripotency

(c) Totipotency                              (d) Gene cloning.

13. Read the given statements and select the correct option.

Statement 1: The number of cells in a multicellular organism is inversely proportional to the size of body.

Statement 2: All the cells in the biological world are of the same size.

(a) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1

(b) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1

(c) Statement 1 is true and statement 2 is false

(d) Both statements 1 and 2 are false.

Answer Key:

(1)-(b); (2)-(d); (3)-(c); (4)-(b); (5)-(a); (6)-(d); (7)-(c); (8)-(b); (9)-(b); (10)-(b); (11)-(c); (12)-(c); (13)-(d)