NIOS Class 10 Science & Technology Chapter 21 Solution

NIOS Class 10 Science & Technology Chapter 21 Solution – Building Blocks Of Life — Cell And Tissues

NIOS Class 10 Science & Technology Solution Chapter 21 Building Blocks Of Life — Cell And Tissues. NIOS Class 10 Science & Technology Chapter 21 Question Answers Download PDF. NIOS Class 10 Science Notes.

NIOS Class 10 Science & Technology Chapter 21 Solution

Board NIOS
Class 10th (Secondary)
Subject Science and Technology (221)
Topic Question Answer, Solution, Notes


CHAPTER: – 21.

(Building Blocks Of Life — Cell And Tissues)




1) Mention whether the following statements are true (T) or false (F). Rewrite the wrong statements correctly.

i) Cell membrane permits inflow and outflow of all molecules. T/F

Ans: –False.

ii) Chloroplast and not chlorophyll is an organelle. T/F

Ans: – True.

iii) Ribosomes are often called suicide bags. T/F

Ans: – False.


2) Name the part of the cell which:

(i) provides rigidity to the plant cell. ____cell wall_________

(ii) bounds semi-fluid content of the cell. ________plasma membrane_____

(iii) helps in intra-cellular distribution of molecules, enzymes and nutrients within the cell. __cytoplasm_______


3) Match the following items in Column A with those in Column B.

Column A                                                    Column B

1.) Master of the cell                               a. chloroplast

2.) Powerhouse of the cell             b. endoplasmic reticulum

3.) Protein factories of the cell            c. mitochondria

4.) Kitchen of the cell                              d. nucleus

5.) Circulatory system of the cell.          e. ribosome

Ans: –

Column A

Column B

Master of cell d. Nucleus
Powerhouse of cell c. Mitochondria
Protein factory of cell e. Ribosomes
Kitchen of the cell a.  Chloroplast
Circulatory system of cell. b.  Endoplasmic reticulum.


4) All cells of organisms have 3 basic parts. Draw and name them.

Ans: –


5)Explain in your own words the three salient points of the cell theory in one sentence each.

Ans: –  (i) Body are made of cells

(ii) New cells created from the division of pre-existing cells

(iii) Function rebuilt from functions of its cells.




1) A seedling grows into a small plant. What kind of division causes this —mitosis or meiosis?

Ans: –  A seeding grows into a small plant; this division is called as the mitosis cell division.


2) Our nails have to be cut occasionally. Which kind of cell division makes the nails long?

Ans: – Our nails have to be cut occasionally; this kind of cell division is known as mitosis.


3)Name the type of cell division that occurs during the following events:

i) repair of skin and injury ____mitosis___________

ii) formation of eggs and sperms in animals _____meiosis__________

iii) increase in the length of stem in plants ____mitosis___________


4) Out of the following organs where does meiosis occur? Hair, liver, testis (male reproductive organ), cheek cell, ovary (female reproductive organ)

Ans: –The testis of male reproductive organ and ovary of female reproductive organ meiosis is occurred.




1)Name the following:

(i) The kind of tissues present at the stem tip of a flowering plant.

Ans: – Meristematic tissue present at the stem tip of a flowering plant.


(ii) The tissue which connects muscle to the bone.

Ans: – Fibrous tissue connect muscle to the bone.


(iii) The kind of tissue which forms the inner lining of blood vessels.

Ans: –  The inner lining of blood vessels is the unstriped tissue.


(iv) Undifferentiated cells which can divide through mitosis and differentiate into specialized cell types.

Ans: – The stem cell divided the mitosis and differentiate into specialized cell types.


2)Where do you find the following in the human body?

(i) Nodes of Ranvier _______nerve cell _________________________

(ii) Ciliated epithelium _______________intestine_________

(iii) Smooth muscles _______blood vessel wall______________________

(iv) Fluid connective tissue ____Blood and lymph_________________________


3) In the flow chart given below fill in the blanks.

Ans: –




1) Name the kind of plant tissue found

(i) at the growing parts of the plant.

Ans: – Meristematic tissue.

(ii) at the root tip.                  

Ans: – Apical meristem.

(iii) in vascular bundles.

Ans: – Xylem and phloem.

(iv) in the inner lining of the intestine.

Ans: – Epithelial

(v) Connecting the adjacent muscle fibres.

Ans: – Tendons.


2) State one point of difference between the following (one key difference only).

(i) Cytoplasm and protoplasm.

Ans: – Protoplasm has nucleus but cytoplasm not.

(ii) Cell wall and cell membrane.

Ans: – cell membrane is present in plant and animal cell and cell wall is present in plant cell only

(iii) Ribosomes and mitochondria.

Ans: – Ribosomes helps in protein synthesis and mitochondria helps in providing power in cell.

(iv) Blood and lymph.

Ans: – The body temperature is controlled by the blood whereas the body works against the pathogens by the helps of the lymph.

(v) Cell and tissue.

Ans: – The fundamental unit of body is known as the cell and this group of cells made a tissue.

(vi) Cartilage and bone.

Ans: – Bone is hard whereas cartilage isnot like that its soft.

(vii) Meristematic tissue and permanent tissue.

Ans: –  Permanent tissue doesn’t helps in growth but meristematic does.


3) Answer these questions.

(i) Which cell organelle is responsible for the release of energy in the form of ATP?

Ans: – Mitochondria is responsible for the release of energy in the cell in ATP form.

(ii) What is the significance of cell membrane?

Ans: – The outer cover of the cell of plant and animal is known as the cell membrane. The cell membrane protects the cell inner side.

(iii) Why are mitochondria known as the ‘powerhouse’ of the cell?

Ans: – As the mitochondria provides the energy to every organ of the cell this mitochondrion is known as the powerhouse of the cell.

(iv) What will happen to a cell if its nucleus is removed?

Ans: – The whole body or the cell are controllable by the nucleus so when it will remove the cell doesn’t work properly or damage.

(v) Is this statement true or false: Plant cells have chloroplasts, but no mitochondria? Justify your answer.

Ans: – The works of mitochondria is to provide the energy to the cell in the plant body whereas the chloroplast also makes the energy for the different plant cell.

(vi) Mention three features found only in plant cells and one found only in animal cells.

Ans: – Chloroplasts, cell wall, globoids only present in plant cell. And in plant cell lysosome present.

(vii) Name three kinds of permanent tissues found in plants. Write one function of each.

Ans: – The three kinds of permanent tissue are –

  • Parenchyma
  • Collenchyma
  • Scremchyma

(viii) What is a protective tissue? Why is epidermis considered as a protective tissue?

Ans: – The protective cell is the cell which present in the outermost part of the cell body. This protective cell protects the cell from the outer affect and this cell protection tissue is cell wall and cell membrane.

(ix) What is stem cell technology? Give its two uses in disease control.

Ans: – The different types of bone marrow disease and the blood cancer is treated by this technology which is cell technology. This technology helps in the control of blood base disease control of the body.


4) Given below is an incomplete table relating to certain structures found in animal/ plant cell, their location and function. Study the table and then give the appropriate answer in terms of structure, location and function for the blanks numbered from 1 to 9.

Ans: –

Structure Location Function
plant Plant cell Photosynthesis
mitosis Animal cell Spindle formation during cell division
cell wall Plant cell Protection
Cell membrane Plant cell Selectively permeable membrane
nucleus Plant cell Control the whole cell


5) Given alongside is a figure of a cell.

(i) Is this a plant cell or an animal cell?

(ii) Name the parts labelled a, b, c, d and e.

(iii) Which of these parts help(s) in protein synthesis?

(iv) Which of these parts is also known as the powerhouse of the cell? Give reasons in support of your answer.

(v) Write the most important function of part labelled ‘a’.

Ans: –

Updated: March 3, 2022 — 3:31 pm

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