Chapter 8 Cell — Structure And Functions

Question 1. Choose the correct statement with respect to unicellular organisms:

(a) in unicellular organisms, tissues work in co-ordination to perform different functions.

(b) unicellular organisms do not require food.

(c) unicellular organisms respire and reproduce.

(d) all unicellular organisms move by cilia.

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

Question 3. Read the different combinations of terms given below:

(a) cell wall, cell membrane, nucleus, plastid

(b) cell wall, nucleus, ribosome, chromosome

(c) cell membrane, mitochondria, ribosome, chromosome

(d) cell membrane, ribosome, mitochondria, chloroplast.

The correct combination of terms with reference to an animal cell is _____.

Question 4. Which one of the following term is not a part of the nucleus?

(a) ribosome

(b) nucleolus

(c) chromosome

(d) gene

Question 5. A suitable term for the various components of cells is

(a) tissue

(b) cell organelles

(c) chromosomes

(d) genes

Question 6. The jelly-like fluid substance present in cells is called

(a) protoplasm

(b) chromosome

(c) chloroplast

(d) cytoplasm

Question 7. Read the following pairs of examples of organisms:

(a) moss and sponge

(b) yeast and Amoeba

(c) bacteria and blue-green alga

(d) penicillium and Spirogyra

The pair that belongs to the group prokaryotes is_____

Question 8. Read the following terms and select the pair that is related to inheritance of characters.

(a) cell wall and cell membrane

(b) chromosome and mitochondria

(c) chloroplast and cell membrane

(d) chromosome and genes

Question 9. Choose the correct statement:

(a) Genes are located in the chromosomes.

(b) Cell is located in the nucleus.

(c) Chromosomes are located in the nucleolus.

(d) Cell membrane surrounds the nucleus.

Question 10. Green colour of leaves is due to presence of the pigment_____

(a) chlorophyll

(b) ribosomes

(c) mitochondira

(d) chloroplast

Question 11. The unit of measurement used for expressing dimension (size) of cells is:

(a) centimeter

(b) millimeter

(c) micrometer

(d) metre

Question 12. The most important function of cell membrane is that it:

(a) controls the entry and exit of materials from cells.

(b) controls only the entry of materials into cells.

(c) controls only the exit of materials from cells.

(d) allows entry and exit of materials without any control.

Question 13. Paheli accidentally placed her hand over a flame and immediately pulled it back. She felt the sensation of heat and reacted due to the action of

(a) blood cells

(b) skin surface

(c) nerve cells

(d) nucleus of cells

Question 14. Of the following parts of a cell listed below, name the part that is common to plant cell, animal cell and a bacterial cell.

(a) chloroplast

(b) cell wall

(c) cell membrane

(d) nucleus

Question 15. The thread-like structures present in the nucleus are

(a) nucleolus

(b) chromosomes

(c) genes

(d) ribosomes

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

Question 17. Which of the following is not a cell?

(a) Red Blood Corpuscle (RBC)

(b) bacterium

(c) spermatozoa

(d) virus

Question 18. Which of the following feature will help you in distinguishing a plant cell from an animal cell?

(a) cell wall

(b) cell membrane

(c) mitochondria

(d) nucleus

Question 19. Under a microscope Paheli observes a cell that has a cell wall but no distinct nucleus. The cell that she observes is

(a) a plant cell

(b) an animal cell

(c) a nerve cell

(d) a bacterial cell

Question 20. Cheek cells do not have _______

(a) cell membrane

(b) nucleus

(c) golgi apparatus

(d) plastids

Question 21. Identify the correct statement.

(a) Tissue is a group of dissimilar cells.

(b) An organ consists of similar cells.

(c) Vacuoles are not found in plant cells.

(d) Prokaryotes do not have nucleus.

Question 22. Which of the following statements are true for eukaryotic cells?

(i) They do not have a nuclear membrane.

(ii) They have a well organised nucleus.

(iii) They have a nuclear membrane.

(iv) Blue green algae are eukaryotic cells.

(a) ii and iv

(b) ii and iii

(c) i and ii

(d) i and iv

Question 23. Identify the correct statement about cells.

(a) All the cells have nucleus.

(b) Cells of an organ have similar structure.

(c) Cells of a tissue have similar structure.

(d) Shape of all types of cells is round.

Question 24. The table given below has certain terms and four blank spaces named A, B, C and D.

From the options given below choose the correct combination of terms.

(a) A-Pseudopodia; B-Respirations; C-Muscle cell; D-Branched

(b) A-Pseudopodia; B-Photosynthesis; C-Muscle cell; D-Branched

(c) A-Contractile vacuole; B-Photosynthesis; C-Blood cell; D-Spindle shaped

(d) A-Pseudopodia; B-Photosynthesis; C-Cheek cell; D-Spindle shaped

Question 25. In leaves, name the cell organelle and pigment that is responsible for green colour.

Question 26. The instrument used to observe cells is ________

Question 27. We do not sense any pain when we clip our nails or cut our hair. Why?

Question 28. In a cell, where are the genes located?

Question 29. Amoeba and Paramecium belong to which category of organisms?

Question 30. What are the functions of cell wall in plant cells?

Question 31. Is the following statement correct? If it is wrong, correct the statement

Statement : “Unicellular organisms do not respire, only multicellular organisms respire”

Question 32. Match the terms given in column I with their functions given in column II and fill the blanks given below the table:

A-_____; B-______; C-______; D-______

Question 33. Observe the following diagram given as Fig. 8.1.

Answer the following questions.

A. Does it represent a plant cell or an animal cell?

B. Does it represent a prokaryotic cell or an eukaryotic cell?

Question 34. Label the parts A to E in the given as Fig. 8.2 diagram.

Question 35. Classify the following terms into cells, tissues and organs and write in the tabular column given below.

RBC, WBC, Nerve cell, blood, muscle, blood vessels, brain, heart, hand

Question 36. Read the following statements and write the appropriate term against each statement.

A. I control the functions of a cell. Who am I? ...................

B. I am like a policeman. I do not allow anything and everything to get in and out of the cell. Who am I? ...................

C. I transfer characters from parents to offsprings. Who am I? ...................

Question 37. Fill in the blanks with the terms given in the box below:

Nucleus, chromosomes, cell wall, cell membrane, protoplasm, cytoplasm, ribosome, cell organelles

The outermost layer of plant cells is the (a) beneath which is the (b) . The term (c) refers to the jelly-like substance containing all the (d) . The (e) contains thread-like structures called (f) .

Question 38. Cells consist of many organelles, yet we do not call any of these organelles as structural and functional unit of living organisms. Explain.

Question 39. Why do plant cells have an additional layer surrounding the cell membrane? What is this layer known as?

Question 40. The size of the cells of an organism has no relation with the size of its body. Do you agree? Give reason for your answer.