Selina Concise Class 10 Biology Solution Chapter No. 1- ‘Cell – The Structural and Functional Unit of Life’ For ICSE Board Students.
Selina Concise Class 10 Biology Chapter 1 Cell – The Structural and Functional Unit of Life Exercise Long Questions and Answers by Biology Teacher here in this post.
Can you identify these?
Answer:-
1) Solution:
a)
Answer:- Mitochondria: It is the cellular structure which synthesize the respiratory enzymes.
b)
Answer:- Cell membrane: Cell membrane which is also known as semipermeable membrane it is made up of lipo protein.
c)
Answer:- Cell wall: it is made up of cellulose. It is present only in plant cell. In theplants, cell wall is a non-living rigid layer surrounding the plasma membrane.
d)
Answer:- Cytoskeleton: Cytoskeleton is the supporting network of protein and supportive framework for the cells.
e)
Answer:- Golgi apparatus: Golgi apparatus which secretes enzymes and hormones consist of cisternae, vesicles and vacuoles.
f)
Answer:- Lysosome: Lysosome which performs the function of intracellular digestion destroys foreign substances.
g)
Answer:- Vacuole: The cell organelle vacuole perform the function of giving rigidity and turgidity to the plant cells.
h)
Answer:- Chromatin Fibers: It is made up of fine DNA threads, which forms the network like structure.
i)
Answer:-Nucleus: Nucleus contains chromatin fibres which contains DNA.
j)
Answer:- Cell organelle:
2) Solution:
a) Answer:-Living organisms or animals made up of only one cell are known as unicellular animals.
– i) Amoebaii) Bacteria
b) Answer:- Single cell plants are known as unicellular plants.
c) Answer:- Cell organelle is a membrane bound structure in living organisms.
eg.- i) Nucleus ii) Mitochondria
d) Answer:-Cell inclusions are the nutrients and non-living part present in the cell.
–i) Vacuoles ii) Granules
e) Answer:- Stain is the material solution of iodine and eosin which make the nucleus distinct.
– i) Iodine ii) Eosin
3) Solution:
(a) Answer:- Leucoplasts – It is colourlesscell organelle without any pigment.
(c) Answer:-Carotene– It is the orange-red pigment found in chromoplast.
(d) Answer:-Dictyosome-It is the scattered Golgi complex found in plant cells.
(e) Answer:- White blood cells are the amoeboid blood cells of human body.
(f) Answer:-Sperm is the smallest and complex cell of human body.
(g) Answer:- Guard cells are the bean-shaped cellsofstomata.
(h) Answer:-Red blood cells (RBCs) are the part of cytoplasm which is devoid of the organelles.
(i) Answer:-Cirstieis the fold-like projection form the inner wall of the mitochondria.
(j) Answer:-Cisternaeare the tubules of Golgi complex.
B.) Solution:
a)
Answer:- i) Cell is the structure which is membrane bound and the basic building block of every living thing.
- ii) Cell is also known as ‘functional unit of the body’.
iii) Cells have different parts having different functions such as organelles which perform certain tasks within the cell membrane.
b)
Answer:-i) Organelle is a structure within a cell which performs various function inside the cell like an organ does in the body.
ii) Some of the important cell organelles are nuclei, ribosomes, mitochondria, chloroplast, etc.
c)
Answer:- Cytoplasm is the semifluid substance and the part of protoplasm or protoplast enclosed by the cell membrane.
ii) It is a thick solution composed of water, salt and proteins.
d)
Answer:- i) Protoplasm is the material containing the living part of a cell which includes cytoplasm, nucleus and other organelles.
ii) Protoplasm is surrounded by plasma membrane.
e)
Answer:- i) It is the central part of an atom or a cell which is also known as largest cell organelle.
ii) Nucleus structure is mostly spherical and it consists of protons and neutrons.
2)
a)
Answer:-
Plant Cells | Animal Cells |
i) Plant cells are larger in size than animal cells. | i) Animal cells are smaller in size than plant cells. |
ii)It has cell wall containing cellulose microfibrils. | ii) There is no cell wall in animal cell. |
iii) Plastids present in plant cell. | iii) Plastides are absent in animal cell. |
iv) Centrioles are absent. | iv) Centrioles are present. |
b) Answer:-
Cell wall | Cell membrane |
i) Cell wall is non-living in nature. | i) Cell membrane is living in nature. |
ii) It is made up of cellulose. | ii) It is made up of proteins. |
iii) It is only present in plant cells. | iii) It is present in all the cells such as animal cells & plant cells. |
c) Ans:-
Centrosome | Chromosomes |
i) It is not present in plant cells. | i) It is present in every organism. |
ii) It is the part of cytoskeleton. | ii) It is the part of nucleus. |
iii) It is placed closed to the nucleus. | iii) It is placed within the nucleus. |
iv) It is the cell organelle. | iv) It is a genetic material. |
d) Answer:-
Chloroplast | Chromoplast |
i) Chloroplast is green coloured. | i) chromoplast is colourful whose colour may be yellow,orange or red. |
ii) Chloroplast absorbs sunlight therefore responsible for the process of photosynthesis. | ii) Chromoplasts are used to store pigments such as carotene. |