Question

chromosomes.
1. Plasma membrane had not been
selectively permeable.
e. Plants lacked anthocyanin.
Who is odd man among us? Give reason.
a. Nucleolus, mitochondria, plastids,
endoplasmic reticulum
6. DNA, Ribosomes, Chlorophyll
Give functions.
1. Plasma membrane
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Answer 1

Answer:

1. Plasma membrane had not been

selectively permeable

Answer : Plasma membrane is selectively permeable which means it allows the entry or exit of selective materials inside and outside the cell. In its absence, the regulated movement of substances in and out of the cell will be affected.

E. Plants lacked anthocyanin.

Answer : Anthocyanin is a pigment which is present in plants and imparts them purplish colour. In the absence of this pigment, the structures which usually have purple colour due to its presence would appear colourless.

Question 3: Who is odd man among us ? Give reason.

a. Nucleolus, mitochondria, plastids, endoplasmic reticulum

Answer : Plastids are the odd one out because they are organelles which are found only in plant cells. Rest all the organelles are found in both plants and animals.

b. DNA. Ribosomes, Chlorophyll

Answer : Chlorophyll is the odd one out beacuse it is a type of pigment which is found in plants only. DNA and ribosomes are found in both plants and animals.

Question 4: Give functions.

a. Functions of the plasma membrane

Answer : It gives shape and support to the cell. It acts as a mechanical barrier to protect the internal contents of the cell. It separates the contents of the cell from its surrounding medium. It performs physical activities such as diffusion and osmosis.

b. Functions of cytoplasm

Answer : It is the medium for all cellular chemical reactions. It is a medium in which the organelles remain suspended. It helps in the movement of the different cellular elements.

c. Functions of lysosomes

Answer : Lysosomes destroy foreign materials that enter the cell. Dead and worn-out organelles are removed by lysosomes. Cells are autolysed by lysosomes, and their contents are released within the cell.

d. Functions of vacuoles

Answer : The main function of vacuoles is to store food in a cell. They also help in storing and expelling wastes and toxic by products of metabolic reactions. They help in maintaining the turgidity and rigidity of a cell.

e. Functions of nucleus

Answer : It is the control centre of a cell as it controls all the activities of the cell. It also contains gene-containing chromosomes which are the units of inheritance in an organism.

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