Class 11 Biology Sample Solution- 5 | Biology Class 11 - NEET PDF Download

 Page 1


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 5 Solution 
 
SECTION A 
 
1. It is due to the predominance of the pigments chlorophyll a and b. 
 
2. The function of cilia in ciliated epithelium is to maintain the flow of mucus or liquid or 
suspended particles constantly in one direction. 
 
3. Dyads are the two cells formed after meiosis I. 
OR 
2
n
 is the formula for cell division which can be used to find the value of n.  
1024 = 2
n
 
n = No. of cycles 
1024 = 210 = 2n ? n = 10 
Thus, 10 cycles of mitosis are there in the original parental single cell. 
 
4. Hexokinase 
 
5. Taste buds are located in the papillae on the upper surface of the tongue. 
OR 
Gastro-oesophageal sphincter 
 
SECTION B 
6. Features of Phylum Mollusca: 
i. They have an organ system level of organisation. 
ii. The body is covered with a calcareous shell. 
iii. Gills are meant for respiration. 
iv. The body is divided into head, muscular foot and visceral hump. 
 
7. Differences between the morphology of stem and root: 
Stem Root 
1. It is the above-ground part of 
the plant. 
1. It is the underground part of the plant. 
2. It bears nodes and internodes.  2. It does not bear nodes and internodes.  
3. It bears axillary and terminal 
buds.  
3. It does not bear any buds.  
4. It is generally green in colour. 4. It is generally brown in colour. 
5. It is positively phototrophic and 
negatively geotropic.  
5. It is negatively phototrophic and 
positively geotropic.  
Page 2


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 5 Solution 
 
SECTION A 
 
1. It is due to the predominance of the pigments chlorophyll a and b. 
 
2. The function of cilia in ciliated epithelium is to maintain the flow of mucus or liquid or 
suspended particles constantly in one direction. 
 
3. Dyads are the two cells formed after meiosis I. 
OR 
2
n
 is the formula for cell division which can be used to find the value of n.  
1024 = 2
n
 
n = No. of cycles 
1024 = 210 = 2n ? n = 10 
Thus, 10 cycles of mitosis are there in the original parental single cell. 
 
4. Hexokinase 
 
5. Taste buds are located in the papillae on the upper surface of the tongue. 
OR 
Gastro-oesophageal sphincter 
 
SECTION B 
6. Features of Phylum Mollusca: 
i. They have an organ system level of organisation. 
ii. The body is covered with a calcareous shell. 
iii. Gills are meant for respiration. 
iv. The body is divided into head, muscular foot and visceral hump. 
 
7. Differences between the morphology of stem and root: 
Stem Root 
1. It is the above-ground part of 
the plant. 
1. It is the underground part of the plant. 
2. It bears nodes and internodes.  2. It does not bear nodes and internodes.  
3. It bears axillary and terminal 
buds.  
3. It does not bear any buds.  
4. It is generally green in colour. 4. It is generally brown in colour. 
5. It is positively phototrophic and 
negatively geotropic.  
5. It is negatively phototrophic and 
positively geotropic.  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
8. Kinetochores are small, disc-shaped structures at the surface of the centromeres. 
Function of kinetochores: 
? They serve as the sites of attachment of spindle fibres to the chromosomes during 
cell division.  
 
9. The core of the cilia/flagella called axoneme has nine pairs of doublets of radially 
arranged peripheral microtubules and a pair of centrally located microtubules. Such an 
arrangement of axonemal microtubules is referred to as the 9+2 arrangement. 
The core of the cilia/flagella has a supporting axial shaft or axoneme in which the 
microtubules are arranged in the 9+2 (11-stranded) arrangement. In such an 
arrangement, nine pairs of doublets of microtubules are arranged peripherally and a 
pair of microtubules is arranged centrally.  
OR 
(a) Polyribosomes or polysomes 
(b) Cristae 
(c) Grana 
(d) Oxysomes or elementary particles 
 
10. Magnesium is absorbed by plants in the form of Mg
2+
 
The two magnesium deficiency symptoms include 
i. Interveinal chlorosis with purple anthocyanin pigmentation appearing first in older 
leaves. 
ii. Chlorotic areas may turn necrotic. 
OR 
Necrosis is caused by the deficiency of  
? Magnesium 
? Copper 
? Potassium 
? Calcium  
 
11. The colour of a leaf kept in the dark frequently becomes yellow or pale green because 
the chlorophyll is degraded and there is no formation of chlorophyll. Carotenoid 
pigments are more stable. 
 
12. Economic uses of agar: 
? It is used as a culture medium to grow microbes in the laboratory. 
? It is used in the preparation of ice cream and jelly. 
? It is also used in the preparation of cosmetics. 
 
 
  
Page 3


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 5 Solution 
 
SECTION A 
 
1. It is due to the predominance of the pigments chlorophyll a and b. 
 
2. The function of cilia in ciliated epithelium is to maintain the flow of mucus or liquid or 
suspended particles constantly in one direction. 
 
3. Dyads are the two cells formed after meiosis I. 
OR 
2
n
 is the formula for cell division which can be used to find the value of n.  
1024 = 2
n
 
n = No. of cycles 
1024 = 210 = 2n ? n = 10 
Thus, 10 cycles of mitosis are there in the original parental single cell. 
 
4. Hexokinase 
 
5. Taste buds are located in the papillae on the upper surface of the tongue. 
OR 
Gastro-oesophageal sphincter 
 
SECTION B 
6. Features of Phylum Mollusca: 
i. They have an organ system level of organisation. 
ii. The body is covered with a calcareous shell. 
iii. Gills are meant for respiration. 
iv. The body is divided into head, muscular foot and visceral hump. 
 
7. Differences between the morphology of stem and root: 
Stem Root 
1. It is the above-ground part of 
the plant. 
1. It is the underground part of the plant. 
2. It bears nodes and internodes.  2. It does not bear nodes and internodes.  
3. It bears axillary and terminal 
buds.  
3. It does not bear any buds.  
4. It is generally green in colour. 4. It is generally brown in colour. 
5. It is positively phototrophic and 
negatively geotropic.  
5. It is negatively phototrophic and 
positively geotropic.  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
8. Kinetochores are small, disc-shaped structures at the surface of the centromeres. 
Function of kinetochores: 
? They serve as the sites of attachment of spindle fibres to the chromosomes during 
cell division.  
 
9. The core of the cilia/flagella called axoneme has nine pairs of doublets of radially 
arranged peripheral microtubules and a pair of centrally located microtubules. Such an 
arrangement of axonemal microtubules is referred to as the 9+2 arrangement. 
The core of the cilia/flagella has a supporting axial shaft or axoneme in which the 
microtubules are arranged in the 9+2 (11-stranded) arrangement. In such an 
arrangement, nine pairs of doublets of microtubules are arranged peripherally and a 
pair of microtubules is arranged centrally.  
OR 
(a) Polyribosomes or polysomes 
(b) Cristae 
(c) Grana 
(d) Oxysomes or elementary particles 
 
10. Magnesium is absorbed by plants in the form of Mg
2+
 
The two magnesium deficiency symptoms include 
i. Interveinal chlorosis with purple anthocyanin pigmentation appearing first in older 
leaves. 
ii. Chlorotic areas may turn necrotic. 
OR 
Necrosis is caused by the deficiency of  
? Magnesium 
? Copper 
? Potassium 
? Calcium  
 
11. The colour of a leaf kept in the dark frequently becomes yellow or pale green because 
the chlorophyll is degraded and there is no formation of chlorophyll. Carotenoid 
pigments are more stable. 
 
12. Economic uses of agar: 
? It is used as a culture medium to grow microbes in the laboratory. 
? It is used in the preparation of ice cream and jelly. 
? It is also used in the preparation of cosmetics. 
 
 
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
SECTION C 
13.    
(a) There is no fruit formation in gymnosperms because they lack an ovary. 
(b) Seeds are 
i. Dicotyledonous (with two cotyledons). Examples: Pea, bean 
ii. Monocotyledonous (with one cotyledon). Example: Onion 
(c) Differences will always exist among individuals; appreciate and bear with them. 
 
14.   
  
Brush-bordered Epithelium Ciliated Epithelium 
i. Cells bear microvilli on their free 
surface. 
ii. Microvilli increase the area of 
absorption. 
iii. Example: Columnar epithelial cells  
i. Cells bear cilia on their free surface. 
ii. Cilia maintain the flow of mucus, liquid 
or suspended particles constantly in one 
direction. 
iii. Examples: Cuboidal and columnar 
epithelial cells 
 
15.  
i. Two large black-coloured, kidney-shaped, compound eyes are located on the dorsal 
side of the head. 
ii. Each eye is composed of a large number of visual elements called ommatidia. 
iii. Ommatidia help a cockroach to receive several images of an object. Such vision is 
called mosaic vision. It has more sensitivity and less resolution. 
OR 
(a) In cockroach, grinding of food particles is performed by gizzard. 
(b) Hindgut of cockroach is differentiated into ileum, colon and rectum. 
(c) In cockroach, blood vessels open into spaces called sinuses. 
 
 
16.  The study of plant anatomy is useful in many ways: 
i. The study helps us understand the way a plant functions carrying out its routine 
activities such as transpiration, photosynthesis and growth and repair.  
ii. It helps botanists and agriculture scientists to understand the disease and cure for 
plants.  
iii. The study of plant anatomy helps in solving various problems related to taxonomy, 
phylogeny, food adulteration, archaeology and manufacture of various wood 
products. 
 
 
  
Page 4


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 5 Solution 
 
SECTION A 
 
1. It is due to the predominance of the pigments chlorophyll a and b. 
 
2. The function of cilia in ciliated epithelium is to maintain the flow of mucus or liquid or 
suspended particles constantly in one direction. 
 
3. Dyads are the two cells formed after meiosis I. 
OR 
2
n
 is the formula for cell division which can be used to find the value of n.  
1024 = 2
n
 
n = No. of cycles 
1024 = 210 = 2n ? n = 10 
Thus, 10 cycles of mitosis are there in the original parental single cell. 
 
4. Hexokinase 
 
5. Taste buds are located in the papillae on the upper surface of the tongue. 
OR 
Gastro-oesophageal sphincter 
 
SECTION B 
6. Features of Phylum Mollusca: 
i. They have an organ system level of organisation. 
ii. The body is covered with a calcareous shell. 
iii. Gills are meant for respiration. 
iv. The body is divided into head, muscular foot and visceral hump. 
 
7. Differences between the morphology of stem and root: 
Stem Root 
1. It is the above-ground part of 
the plant. 
1. It is the underground part of the plant. 
2. It bears nodes and internodes.  2. It does not bear nodes and internodes.  
3. It bears axillary and terminal 
buds.  
3. It does not bear any buds.  
4. It is generally green in colour. 4. It is generally brown in colour. 
5. It is positively phototrophic and 
negatively geotropic.  
5. It is negatively phototrophic and 
positively geotropic.  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
8. Kinetochores are small, disc-shaped structures at the surface of the centromeres. 
Function of kinetochores: 
? They serve as the sites of attachment of spindle fibres to the chromosomes during 
cell division.  
 
9. The core of the cilia/flagella called axoneme has nine pairs of doublets of radially 
arranged peripheral microtubules and a pair of centrally located microtubules. Such an 
arrangement of axonemal microtubules is referred to as the 9+2 arrangement. 
The core of the cilia/flagella has a supporting axial shaft or axoneme in which the 
microtubules are arranged in the 9+2 (11-stranded) arrangement. In such an 
arrangement, nine pairs of doublets of microtubules are arranged peripherally and a 
pair of microtubules is arranged centrally.  
OR 
(a) Polyribosomes or polysomes 
(b) Cristae 
(c) Grana 
(d) Oxysomes or elementary particles 
 
10. Magnesium is absorbed by plants in the form of Mg
2+
 
The two magnesium deficiency symptoms include 
i. Interveinal chlorosis with purple anthocyanin pigmentation appearing first in older 
leaves. 
ii. Chlorotic areas may turn necrotic. 
OR 
Necrosis is caused by the deficiency of  
? Magnesium 
? Copper 
? Potassium 
? Calcium  
 
11. The colour of a leaf kept in the dark frequently becomes yellow or pale green because 
the chlorophyll is degraded and there is no formation of chlorophyll. Carotenoid 
pigments are more stable. 
 
12. Economic uses of agar: 
? It is used as a culture medium to grow microbes in the laboratory. 
? It is used in the preparation of ice cream and jelly. 
? It is also used in the preparation of cosmetics. 
 
 
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
SECTION C 
13.    
(a) There is no fruit formation in gymnosperms because they lack an ovary. 
(b) Seeds are 
i. Dicotyledonous (with two cotyledons). Examples: Pea, bean 
ii. Monocotyledonous (with one cotyledon). Example: Onion 
(c) Differences will always exist among individuals; appreciate and bear with them. 
 
14.   
  
Brush-bordered Epithelium Ciliated Epithelium 
i. Cells bear microvilli on their free 
surface. 
ii. Microvilli increase the area of 
absorption. 
iii. Example: Columnar epithelial cells  
i. Cells bear cilia on their free surface. 
ii. Cilia maintain the flow of mucus, liquid 
or suspended particles constantly in one 
direction. 
iii. Examples: Cuboidal and columnar 
epithelial cells 
 
15.  
i. Two large black-coloured, kidney-shaped, compound eyes are located on the dorsal 
side of the head. 
ii. Each eye is composed of a large number of visual elements called ommatidia. 
iii. Ommatidia help a cockroach to receive several images of an object. Such vision is 
called mosaic vision. It has more sensitivity and less resolution. 
OR 
(a) In cockroach, grinding of food particles is performed by gizzard. 
(b) Hindgut of cockroach is differentiated into ileum, colon and rectum. 
(c) In cockroach, blood vessels open into spaces called sinuses. 
 
 
16.  The study of plant anatomy is useful in many ways: 
i. The study helps us understand the way a plant functions carrying out its routine 
activities such as transpiration, photosynthesis and growth and repair.  
ii. It helps botanists and agriculture scientists to understand the disease and cure for 
plants.  
iii. The study of plant anatomy helps in solving various problems related to taxonomy, 
phylogeny, food adulteration, archaeology and manufacture of various wood 
products. 
 
 
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
17. It is the description of the basic structure of a protein. 
In this, the protein exists as a long chain of amino acids arranged in a particular 
sequence; such a polypeptide is non-functional. 
The positional information of amino acids in a protein is given by the primary structure 
of the protein. In this chain, the amino acid at the left end is the first amino acid   
(usually methionine), while the one at the right end is the last amino acid of the protein. 
The first amino acid is called the N-terminal amino acid and the last is called the C-
terminal amino acid. 
 
18.  Characteristics: 
(a) They are cylindrical-shaped cell organelles which have finger-like folds in the inner 
membrane called cristae.  
(b) Mitochondria are semi-autonomous due to the presence of their own DNA and 
ribosomes. 
 
 
OR 
Nuclear pores are the pores or perforations which occur at several places in the nuclear 
envelope.  
Functions: 
i. They maintain the shape of the nucleus. 
ii. These nuclear pores are the passages through which movement of RNA and protein 
molecules takes place in both directions between the nucleus and the cytoplasm. 
iii. They preserve the stability of genetic material by protecting it from respiratory 
breakdown which occurs in the cytoplasm. 
 
 
  
Page 5


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 5 Solution 
 
SECTION A 
 
1. It is due to the predominance of the pigments chlorophyll a and b. 
 
2. The function of cilia in ciliated epithelium is to maintain the flow of mucus or liquid or 
suspended particles constantly in one direction. 
 
3. Dyads are the two cells formed after meiosis I. 
OR 
2
n
 is the formula for cell division which can be used to find the value of n.  
1024 = 2
n
 
n = No. of cycles 
1024 = 210 = 2n ? n = 10 
Thus, 10 cycles of mitosis are there in the original parental single cell. 
 
4. Hexokinase 
 
5. Taste buds are located in the papillae on the upper surface of the tongue. 
OR 
Gastro-oesophageal sphincter 
 
SECTION B 
6. Features of Phylum Mollusca: 
i. They have an organ system level of organisation. 
ii. The body is covered with a calcareous shell. 
iii. Gills are meant for respiration. 
iv. The body is divided into head, muscular foot and visceral hump. 
 
7. Differences between the morphology of stem and root: 
Stem Root 
1. It is the above-ground part of 
the plant. 
1. It is the underground part of the plant. 
2. It bears nodes and internodes.  2. It does not bear nodes and internodes.  
3. It bears axillary and terminal 
buds.  
3. It does not bear any buds.  
4. It is generally green in colour. 4. It is generally brown in colour. 
5. It is positively phototrophic and 
negatively geotropic.  
5. It is negatively phototrophic and 
positively geotropic.  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
8. Kinetochores are small, disc-shaped structures at the surface of the centromeres. 
Function of kinetochores: 
? They serve as the sites of attachment of spindle fibres to the chromosomes during 
cell division.  
 
9. The core of the cilia/flagella called axoneme has nine pairs of doublets of radially 
arranged peripheral microtubules and a pair of centrally located microtubules. Such an 
arrangement of axonemal microtubules is referred to as the 9+2 arrangement. 
The core of the cilia/flagella has a supporting axial shaft or axoneme in which the 
microtubules are arranged in the 9+2 (11-stranded) arrangement. In such an 
arrangement, nine pairs of doublets of microtubules are arranged peripherally and a 
pair of microtubules is arranged centrally.  
OR 
(a) Polyribosomes or polysomes 
(b) Cristae 
(c) Grana 
(d) Oxysomes or elementary particles 
 
10. Magnesium is absorbed by plants in the form of Mg
2+
 
The two magnesium deficiency symptoms include 
i. Interveinal chlorosis with purple anthocyanin pigmentation appearing first in older 
leaves. 
ii. Chlorotic areas may turn necrotic. 
OR 
Necrosis is caused by the deficiency of  
? Magnesium 
? Copper 
? Potassium 
? Calcium  
 
11. The colour of a leaf kept in the dark frequently becomes yellow or pale green because 
the chlorophyll is degraded and there is no formation of chlorophyll. Carotenoid 
pigments are more stable. 
 
12. Economic uses of agar: 
? It is used as a culture medium to grow microbes in the laboratory. 
? It is used in the preparation of ice cream and jelly. 
? It is also used in the preparation of cosmetics. 
 
 
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
SECTION C 
13.    
(a) There is no fruit formation in gymnosperms because they lack an ovary. 
(b) Seeds are 
i. Dicotyledonous (with two cotyledons). Examples: Pea, bean 
ii. Monocotyledonous (with one cotyledon). Example: Onion 
(c) Differences will always exist among individuals; appreciate and bear with them. 
 
14.   
  
Brush-bordered Epithelium Ciliated Epithelium 
i. Cells bear microvilli on their free 
surface. 
ii. Microvilli increase the area of 
absorption. 
iii. Example: Columnar epithelial cells  
i. Cells bear cilia on their free surface. 
ii. Cilia maintain the flow of mucus, liquid 
or suspended particles constantly in one 
direction. 
iii. Examples: Cuboidal and columnar 
epithelial cells 
 
15.  
i. Two large black-coloured, kidney-shaped, compound eyes are located on the dorsal 
side of the head. 
ii. Each eye is composed of a large number of visual elements called ommatidia. 
iii. Ommatidia help a cockroach to receive several images of an object. Such vision is 
called mosaic vision. It has more sensitivity and less resolution. 
OR 
(a) In cockroach, grinding of food particles is performed by gizzard. 
(b) Hindgut of cockroach is differentiated into ileum, colon and rectum. 
(c) In cockroach, blood vessels open into spaces called sinuses. 
 
 
16.  The study of plant anatomy is useful in many ways: 
i. The study helps us understand the way a plant functions carrying out its routine 
activities such as transpiration, photosynthesis and growth and repair.  
ii. It helps botanists and agriculture scientists to understand the disease and cure for 
plants.  
iii. The study of plant anatomy helps in solving various problems related to taxonomy, 
phylogeny, food adulteration, archaeology and manufacture of various wood 
products. 
 
 
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
17. It is the description of the basic structure of a protein. 
In this, the protein exists as a long chain of amino acids arranged in a particular 
sequence; such a polypeptide is non-functional. 
The positional information of amino acids in a protein is given by the primary structure 
of the protein. In this chain, the amino acid at the left end is the first amino acid   
(usually methionine), while the one at the right end is the last amino acid of the protein. 
The first amino acid is called the N-terminal amino acid and the last is called the C-
terminal amino acid. 
 
18.  Characteristics: 
(a) They are cylindrical-shaped cell organelles which have finger-like folds in the inner 
membrane called cristae.  
(b) Mitochondria are semi-autonomous due to the presence of their own DNA and 
ribosomes. 
 
 
OR 
Nuclear pores are the pores or perforations which occur at several places in the nuclear 
envelope.  
Functions: 
i. They maintain the shape of the nucleus. 
ii. These nuclear pores are the passages through which movement of RNA and protein 
molecules takes place in both directions between the nucleus and the cytoplasm. 
iii. They preserve the stability of genetic material by protecting it from respiratory 
breakdown which occurs in the cytoplasm. 
 
 
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 5 Solution 
 
     
 
19. Differences between mitosis and meiosis: 
 
Mitosis Meiosis 
1. Takes place in somatic cells. 1. Takes place in gametic cells. 
2. Two daughter cells are formed. 2. Four daughter cells are formed. 
3. The number of chromosomes 
remains the same in daughter 
cells as compared to that in 
parent cells. 
3.  The number of chromosomes is     
halved in daughter cells as 
compared to that in parent cells. 
 
20. In apoplastic movement of water, water moves through the cell wall but does not enter 
the cell sap. Thus, the movement of water is continuous except at the casparian strips. 
This flow occurs due to adhesive and cohesive forces of water molecules. Water does 
not enter the cell membrane or cytoplasm during this process. 
OR 
Role of protein pumps in active transport in plants: 
? Protein pumps are membrane proteins which make use of energy for the transport 
of substances across the membrane. 
? These pumps form a complex with the substance to be transported using energy. 
? This complex moves across the membrane, releases the substance and the pump is 
ready for the transport of another molecule. 
? The pumps can transport substances even from lower concentration to higher 
concentration, i.e. against the concentration gradient.  
 
21. Ubiquinone receives the electrons after its oxidation by NADH dehydrogenase 
(Complex I). It also receives reducing equivalents through FADH2 which is generated 
during oxidation of succinate through the activity of succinate dehydrogenase (Complex 
II). This leads to reduction of ubiquinone to ubiquinol. Ubiquinone is located in the 
inner mitochondrial membrane. 
                                                              
22. Carbon dioxide is transported in three forms in our blood:  
i. In the dissolved form in the plasma 
ii. In the form of bicarbonates 
iii. As carbaminohaemoglobin 
 
23.  The secretion of glucagon will be suppressed and insulin will be secreted in response to 
the high glucose level in blood. It acts on hepatocytes and adipocytes, and enhances 
cellular glucose uptake and utilisation. As a result, there is a rapid movement of glucose 
from the blood to hepatocytes and adipocytes, resulting in decreased blood glucose 
levels (hypoglycaemia).