Solution of Chapter 5. The Fundamental Unit of Life (NCERT Science Exemplar Book)

Which of the following can be made into crystal?

A cell will swell up if

Chromosomes are made up of

Which of these options are not a function of Ribosomes?

(i) It helps in manufacture of protein molecules

(ii) It helps in manufacture of enzymes

(iii) It helps in manufacture of hormones

(iv) It helps in manufacture of starch molecules

Which of these is not related to endoplasmic reticulum?

Following are a few definitions of osmosis

Read carefully and select the correct definition

Plasmolysis in a plant cell is defined as

Which of the following are covered by a single membrane?

Find out the false sentences

Find out the correct sentence

Which cell organelle plays a crucial role in detoxifying many poisons and drugs in a cell?

The proteins and lipids, essential for building the cell membrane, are manufactured by

The undefined nuclear region of prokaryotes are also known as

The cell organelle involved in forming complex sugars from simple sugars are

Which out of the following is not a function of vacuole?

Amoeba acquires its food through a process, termed

Cell wall of which one of these is not made up of cellulose?

Silver nitrate solution is used to study

Organelle other than nucleus, containing DNA is

Kitchen of the cell is

Lipid molecules in the cell are synthesized by

Cell arises from pre-existing cell was stated by

Cell theory was given by

The only cell organelle seen in prokaryotic cell is

Organelle without a cell membrane is

1 μ m is

Lysosome arises from

Living cells were discovered by

Select the odd one out

Why are lysosomes known as ‘suicide-bags’ of a cell?

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

Why does the skin of your finger shrink when you wash clothes for a long time?

Why is endocytosis found in animals only?

A person takes concentrated solution of salt, after sometime, he starts vomiting. What is the phenomenon responsible for such situation? Explain.

Name any cell organelle which is non-membranous.

We eat food composed of all the nutrients like carbohydrates, proteins, fats, vitamins, minerals and water. After digestion, these are absorbed in the form of glucose, amino acids, fatty acids, glycerol etc.

What mechanisms are involved in absorption of digested food and water?

If you are provided with some vegetables to cook. You generally add salt into the vegetables during cooking process. After adding salt, vegetables release water. What mechanism is responsible for this?

If cells of onion peel and RBC are separately kept in hypotonic solution, what among the following will take place? Explain the reason for your answer.

(a) Both the cells will swell.

(b) RBC will burst easily while cells of onion peel will resist the bursting to some extent.

(c) a and b both are correct.

(d) RBC and onion peel cells will behave similarly.

Bacteria do not have chloroplast but some bacteria are photoautotrophic in nature and perform photosynthesis. Which part of bacterial cell performs this?

Match the following A and B

Write the name of different plant parts in which chromoplast, chloroplast and leucoplast are present.

Name the organelles which show the analogy written as under

(a) Transporting channels of the cell _______

(b) Power house of the cell ______

(c) Packaging and dispatching unit of the cell _______

(d) Digestive bag of the cell _______

(e) Storage sacs of the cell _______

(f) Kitchen of the cell ________

(g) Control room of the cell ______

How is a bacterial cell different from an onion peel cell?

How do substances like carbon dioxide (CO₂) and water (HO₂) move in and out of the cell?

How does amoeba obtain its food?

Name the two organelles in a plant cell that contain their own genetic material and ribosomes.

Why are lysosomes also known as “scavengers of the cells”?

Which cell organelle controls most of the activities of the cell?

Which kind of plastid is more common in

(a) roots of the plant (b) leaves of the plant (c) flowers and fruits

Why do plant cells possess large sized vacuole?

How are chromatin, chromatid and chromosomes related to each other?

What are the consequences of the following conditions?

(a) A cell containing higher water concentration than the surrounding medium

(b) A cell having low water concentration than the surrounding medium.

(c) A cell having equal water concentration to its surrounding medium.

Draw a plant cell and label the parts which

(a) determines the function and development of the cell

(b) packages materials coming from the endoplasmic reticulum

(c) provides resistance to microbes to withstand hypotonic external media without bursting

(d) is site for many biochemical reactions necessary to sustain life.

(e) is a fluid contained inside the nucleus

Illustrate only a plant cell as seen under electron microscope. How is it different from animal cell?

Draw a neat labelled diagram of an animal cell.

Draw a well labelled diagram of an eukaryotic nucleus. How is it different from nucleoid?

Differentiate between rough and smooth endoplasmic reticulum. How is endoplasmic reticulum important for membrane biogenesis?

In brief state what happens when

Draw a neat diagram of plant cell and label any three parts which differentiate it from animal cell.