1 Cell: The Unit of Life: Solutions
1 Cell: The Unit of Life: Solutions
1 Cell: The Unit of Life: Solutions
Solutions
SECTION - A
1. Answer (4)
Mitochondria can be seen only after staining with vital stains. Mitochondria possess circular DNA and their
number per cell varies according to the activity of cell.
2. Answer (2)
C - Middle lamella
A - Primary cell wall
B - Secondary cell wall
3. Answer (3)
Nucleolus - membraneless
4. Answer (4)
G. Palade - Ribosome
5. Answer (3)
– Ribosome is the only cell organelle found in both prokaryotic and eukaryotic cell.
– Fimbriae are fine bristle like structures of bacteria, which help in attachment with substratum.
6. Answer (2)
7. Answer (2)
8. Answer (3)
Centrosome - 9 + 0 microtubule arrangement.
9. Answer (4)
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2 Cell : The Unit of Life Solutions of Assignment
SECTION - B
1. Answer (4)
Rudolf Virchow modified the cell theory and gave it a final shape.
2. Answer (3)
Mesosomes are specialised extension of plasma membrane that help in respiration, secretion and replication of
DNA.
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Solutions of Assignment Cell : The Unit of Life 3
3. Answer (2)
Glycocalyx is the outermost covering of bacterial cell that help in cell adhesion as well as protect it from host
immune system.
4. Answer (2)
Animals, protists, fungi and lower plants possess centrioles while higher plants lack centriole.
5. Answer (3)
Thickness as well as composition of glycocalyx differ in bacteria.
6. Answer (2)
Plasmid DNA confers extra phenotypic characters to bacteria such as antibiotic resistance.
7. Answer (2)
Middle lamella – Jointly secreted by daughter cells
Plasmodesmata – Connects the cytoplasm of neighbouring cells.
8. Answer (3)
Lipids of plasma membrane are quasi-fluid in nature.
9. Answer (2)
Ribosomes – made of RNA + proteins
Primary cell wall – capable of extension
Endomembrance system – Organelles function in co-ordination.
SECTION - C
1. Answer (2)
(a) Golgi apparatus (iii) Formation of glycoproteins and glycolipids
(b) Lysosomes (iv) Digesting biomolecules
(c) Vacuoles (ii) Trap waste and excretory products
(d) Ribosomes (i) Synthesis of protein
2. Answer (3)
The important function of Golgi apparatus is to process, package and transport the materials for secretion.
Therefore secretory cells have Golgi apparatus in highest number.
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Solutions of Assignment Cell : The Unit of Life 5
3. Answer (4)
Nucleolus is non-membranous nucleoplasmic structure in nucleus.
Nucleolus is the site of ribosomal RNA (rRNA) synthesis.
4. Answer (2)
Sub metacentric chromosome is Heterobrachial.
Short arm designated as 'p' arm
(p = petite i.e. short)
Long arm designated as 'q' arm
5. Answer (4)
Lysosomes bud off from trans face of Golgi bodies.
Precursor of lysosomal enzymes are synthesised by RER and then send to Golgi bodies for further processing.
6. Answer (3)
Lysosomes and Vacuoles do not have DNA.
7. Answer (2)
In mitochondria, enzymes for electron transport are present in the inner membrane.
8. Answer (1)
Concept of “Omnis cellula-e cellula” regarding cell division was proposed by Rudolph Virchow.
9. Answer (1)
The phenomenon of association of many ribosomes with single m-RNA leads to formation of polyribosomes
or polysomes or ergasomes.
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8 Cell : The Unit of Life Solutions of Assignment
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Solutions of Assignment Cell : The Unit of Life 9
64. Answer (2)
Phosphoglycerides
Muramic acid Component of bacterial cell wall
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10 Cell : The Unit of Life Solutions of Assignment
Plasmodesmata
Cristae
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Solutions of Assignment Cell : The Unit of Life 11
95. Answer (2)
Chromoplasts contain coloured pigment.
Amyloplasts Store starch
Elaioplasts Fats
Aleuroplasts Proteins
Centromer
Spindle
fibres
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12 Cell : The Unit of Life Solutions of Assignment
Centromere
Telomere
111. Answer (4)
1 Telomere 1 2 Telomere
Centromere Centromere
2 Telomere 3 4 Telomere
(More than one) (Less than five)
SECTION - D
1. Answer (3)
Tunnel proteins – run throughout the lipid bilayer.
2. Answer (1)
Cytoskeleton – in eukaryotes
3. Answer (3)
Synthesis of carbohydrate occur in chloroplast.
4. Answer (2)
Microtubules
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Solutions of Assignment Cell : The Unit of Life 13
5. Answer (4)
6. Answer (1)
Dictyotene
7. Answer (4)
Equal arms in metacentric chromosomes.
8. Answer (2)
Centrioles are non membrane bound structures.
9. Answer (3)
Stroma
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Solutions of Assignment Cell : The Unit of Life 15
39. Answer (1)
The organelle in picture is Golgi complex.
B Arm
C Centromere
D Arm
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