Selina solutions concise biology class 6 icse Solutions for Chapter 3 cell the structure and function

Q1) Put a tick mark against the corredct alternative in th following statements :

(a) Identify the part which contain pigment:

1. Cell membrane

2. Plastid

3. centrosome

4. Cell wall

(b) The organelle that controls all activities in

1. nucleus

2. vacuole

3. Plastids

4. cytoplasm

(c) A cell that is spherical in shape is:

1. white blood cell

2. nerve cell

3. red blood cell

4. amoeba

(d) The vacuole contains:

1. water

2. cell sap

3. salts

4. food

Q1) Name the scientist who invented the first microscope.

Q2) Who coined the term “cell” ?

Q3) Briefly describe the three essential basic parts of a cell.

Q4) The cell membrane is called selectively permeable. Why ?

Q5) State the difference between

(i) Nucleus and nucleolus

(ii) Cytoplasm and protoplasm

(iii) Cell wall and cell membrane

Q6) List the major differences between a plant cell and an animal cell.

Q7) Briefly discuss the importance of chromosomes to an organism.

Q8) Fill in the blanks with the terms given below :

Pigments, wall, pre-existing , cell, vacoules

1. The _______ is the structural unit of all living things.

2. All cells arise from __________ cells.

3. Animal cells have no cell ______.

4. Plastids contain __________.

5. _________ are filled with water and dissolved substances.

Q9) Try to find the names of four cell organelles hidden in this maze.(hint : The hidden words can appear horizontally or vertically; forwards or backward or even mixed up). Write them in the lines provided. For example : “NUCLEUS” in the last row, seven backward letters .