Class 11 Biology Sample Solution- 8 | Biology for Grade 11 PDF Download

 Page 1


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 8 Solution 
 
SECTION A 
 
1. Urochordates are also called tunicates because the adult body is enclosed within a 
leathery test or tunic formed of a cellulose-like organic substance termed tunicin. 
OR 
Parapodia are lateral appendages. They help in locomotion.  
 
2. A neem leaf is pinnately compound because its lamina is completely broken up into 
distinct segments or leaflets which are separately articulated at the base. 
 
3. Insulin 
 
4. It requires a membrane, a proton pump, a proton gradient and the enzyme ATPase. 
OR 
LHC is light harvesting complex. It is present in both photosystem I and photosystem II. 
 
5. Sebaceous glands (wax glands) 
 
SECTION B 
 
6. Bryophytes are called amphibians of the plant kingdom because they live in soil but 
require an external layer of water for their existence so that the male gametes can swim 
and reach the archegonia. 
 
7.   
i. In Amoeba, the contractile vacuole is involved in excretion and osmoregulation. 
ii. In protists, food vacuoles contain digestive enzymes which help digest nutrients. 
 
8. When pCO2 is high and pO2 is low as in the tissue, more binding of carbon dioxide with 
haemoglobin occurs, whereas when the pCO2 is low and pO2 is high as in the alveoli, 
dissociation of CO2 from carbaminohaemoglobin takes place. 
 
9. Emphysema is inflation or abnormal distension of the bronchioles or alveolar sacs of 
the lungs. As the alveolar septa collapse, the surface area for gas exchange is greatly 
reduced. 
Causes of emphysema: 
i. Cigarette smoking 
ii. Inhalation of other smoke or toxic substances over a period of time 
Page 2


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 8 Solution 
 
SECTION A 
 
1. Urochordates are also called tunicates because the adult body is enclosed within a 
leathery test or tunic formed of a cellulose-like organic substance termed tunicin. 
OR 
Parapodia are lateral appendages. They help in locomotion.  
 
2. A neem leaf is pinnately compound because its lamina is completely broken up into 
distinct segments or leaflets which are separately articulated at the base. 
 
3. Insulin 
 
4. It requires a membrane, a proton pump, a proton gradient and the enzyme ATPase. 
OR 
LHC is light harvesting complex. It is present in both photosystem I and photosystem II. 
 
5. Sebaceous glands (wax glands) 
 
SECTION B 
 
6. Bryophytes are called amphibians of the plant kingdom because they live in soil but 
require an external layer of water for their existence so that the male gametes can swim 
and reach the archegonia. 
 
7.   
i. In Amoeba, the contractile vacuole is involved in excretion and osmoregulation. 
ii. In protists, food vacuoles contain digestive enzymes which help digest nutrients. 
 
8. When pCO2 is high and pO2 is low as in the tissue, more binding of carbon dioxide with 
haemoglobin occurs, whereas when the pCO2 is low and pO2 is high as in the alveoli, 
dissociation of CO2 from carbaminohaemoglobin takes place. 
 
9. Emphysema is inflation or abnormal distension of the bronchioles or alveolar sacs of 
the lungs. As the alveolar septa collapse, the surface area for gas exchange is greatly 
reduced. 
Causes of emphysema: 
i. Cigarette smoking 
ii. Inhalation of other smoke or toxic substances over a period of time 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
OR 
? Amylase is secreted by salivary glands and pancreas.  
? Salivary glands secrete saliva which contains salivary amylase into the buccal cavity 
and converts starch to maltose.  
? The pancreas secretes pancreatic juice containing pancreatic amylase into the 
duodenum. It acts on starch and breaks it into maltose. 
 
10. Features of parasitic Platyhelminthes: 
? They have a thick cuticle. 
? They lack an alimentary canal and absorb the nutrients directly through their body 
surface. 
? They even show the presence of hooks and suckers.  
 
11. Differences between fibrous roots and adventitious roots: 
Fibrous roots Adventitious roots 
1. They arise from the radicle which 
becomes repeatedly branched and 
a tuft of roots arise from the base of 
the stem. 
1. They arise from any part of the 
plant, other than the radicle.  
2. They are meant for anchorage and 
absorption.  
2. They serve functions like storage, 
climbing and respiration. 
3. They are characteristic of grasses.  3. They are found in a variety of 
plants. 
4. They are usually present below the 
soil. 
4. They may be underground or 
aerial.  
 
OR 
 
In mango, the pericarp is well differentiated into an outer thin epicarp, a middle fleshy 
edible mesocarp and an inner endocarp which is stony and hard. 
 
 
  
Page 3


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 8 Solution 
 
SECTION A 
 
1. Urochordates are also called tunicates because the adult body is enclosed within a 
leathery test or tunic formed of a cellulose-like organic substance termed tunicin. 
OR 
Parapodia are lateral appendages. They help in locomotion.  
 
2. A neem leaf is pinnately compound because its lamina is completely broken up into 
distinct segments or leaflets which are separately articulated at the base. 
 
3. Insulin 
 
4. It requires a membrane, a proton pump, a proton gradient and the enzyme ATPase. 
OR 
LHC is light harvesting complex. It is present in both photosystem I and photosystem II. 
 
5. Sebaceous glands (wax glands) 
 
SECTION B 
 
6. Bryophytes are called amphibians of the plant kingdom because they live in soil but 
require an external layer of water for their existence so that the male gametes can swim 
and reach the archegonia. 
 
7.   
i. In Amoeba, the contractile vacuole is involved in excretion and osmoregulation. 
ii. In protists, food vacuoles contain digestive enzymes which help digest nutrients. 
 
8. When pCO2 is high and pO2 is low as in the tissue, more binding of carbon dioxide with 
haemoglobin occurs, whereas when the pCO2 is low and pO2 is high as in the alveoli, 
dissociation of CO2 from carbaminohaemoglobin takes place. 
 
9. Emphysema is inflation or abnormal distension of the bronchioles or alveolar sacs of 
the lungs. As the alveolar septa collapse, the surface area for gas exchange is greatly 
reduced. 
Causes of emphysema: 
i. Cigarette smoking 
ii. Inhalation of other smoke or toxic substances over a period of time 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
OR 
? Amylase is secreted by salivary glands and pancreas.  
? Salivary glands secrete saliva which contains salivary amylase into the buccal cavity 
and converts starch to maltose.  
? The pancreas secretes pancreatic juice containing pancreatic amylase into the 
duodenum. It acts on starch and breaks it into maltose. 
 
10. Features of parasitic Platyhelminthes: 
? They have a thick cuticle. 
? They lack an alimentary canal and absorb the nutrients directly through their body 
surface. 
? They even show the presence of hooks and suckers.  
 
11. Differences between fibrous roots and adventitious roots: 
Fibrous roots Adventitious roots 
1. They arise from the radicle which 
becomes repeatedly branched and 
a tuft of roots arise from the base of 
the stem. 
1. They arise from any part of the 
plant, other than the radicle.  
2. They are meant for anchorage and 
absorption.  
2. They serve functions like storage, 
climbing and respiration. 
3. They are characteristic of grasses.  3. They are found in a variety of 
plants. 
4. They are usually present below the 
soil. 
4. They may be underground or 
aerial.  
 
OR 
 
In mango, the pericarp is well differentiated into an outer thin epicarp, a middle fleshy 
edible mesocarp and an inner endocarp which is stony and hard. 
 
 
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
12. Crossing over is the phenomenon of exchange of equivalent segments between non-
sister chromatids of homologous chromosomes during prophase I of meiosis.  
The enzyme recombinase is involved in the phenomenon of crossing over.    
 
SECTION C 
 
13.   
Intracellular Digestion Extracellular Digestion 
(i) It occurs within the cells. 
(ii) Only a few enzymes are associated 
with this digestion. 
(iii) It occurs in unicellular organisms 
and some lower organisms. 
 
(i) It occurs outside the cells in the 
cavity of the alimentary canal. 
(ii) A large number of digestive glands 
and enzymes are associated with 
this digestion. 
(iii) It occurs in multicellular 
organisms. 
 
14. In earthworm, four pairs of tubular hearts are present. 
The anterior two pairs of the hearts known as the lateral hearts lie in the 7
th
 and 9
th
 
segments, while the posterior pairs called latero-oesophageal hearts are situated in the 
12
th
 and 13
th
 segments. 
OR 
Exoskeleton of cockroach: 
? In cockroach, the exoskeleton is hard, chitinous and brown. 
? It is made of hardened plates called sclerites. 
? The sclerites present on the dorsal side are called tergites, and the ones present on 
the ventral side are sternites. 
? Tergites and sternites are joined to one another by a flexible, articular membrane 
called the arthrodial membrane. 
 
15. Digestive system of frog: 
 
Page 4


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 8 Solution 
 
SECTION A 
 
1. Urochordates are also called tunicates because the adult body is enclosed within a 
leathery test or tunic formed of a cellulose-like organic substance termed tunicin. 
OR 
Parapodia are lateral appendages. They help in locomotion.  
 
2. A neem leaf is pinnately compound because its lamina is completely broken up into 
distinct segments or leaflets which are separately articulated at the base. 
 
3. Insulin 
 
4. It requires a membrane, a proton pump, a proton gradient and the enzyme ATPase. 
OR 
LHC is light harvesting complex. It is present in both photosystem I and photosystem II. 
 
5. Sebaceous glands (wax glands) 
 
SECTION B 
 
6. Bryophytes are called amphibians of the plant kingdom because they live in soil but 
require an external layer of water for their existence so that the male gametes can swim 
and reach the archegonia. 
 
7.   
i. In Amoeba, the contractile vacuole is involved in excretion and osmoregulation. 
ii. In protists, food vacuoles contain digestive enzymes which help digest nutrients. 
 
8. When pCO2 is high and pO2 is low as in the tissue, more binding of carbon dioxide with 
haemoglobin occurs, whereas when the pCO2 is low and pO2 is high as in the alveoli, 
dissociation of CO2 from carbaminohaemoglobin takes place. 
 
9. Emphysema is inflation or abnormal distension of the bronchioles or alveolar sacs of 
the lungs. As the alveolar septa collapse, the surface area for gas exchange is greatly 
reduced. 
Causes of emphysema: 
i. Cigarette smoking 
ii. Inhalation of other smoke or toxic substances over a period of time 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
OR 
? Amylase is secreted by salivary glands and pancreas.  
? Salivary glands secrete saliva which contains salivary amylase into the buccal cavity 
and converts starch to maltose.  
? The pancreas secretes pancreatic juice containing pancreatic amylase into the 
duodenum. It acts on starch and breaks it into maltose. 
 
10. Features of parasitic Platyhelminthes: 
? They have a thick cuticle. 
? They lack an alimentary canal and absorb the nutrients directly through their body 
surface. 
? They even show the presence of hooks and suckers.  
 
11. Differences between fibrous roots and adventitious roots: 
Fibrous roots Adventitious roots 
1. They arise from the radicle which 
becomes repeatedly branched and 
a tuft of roots arise from the base of 
the stem. 
1. They arise from any part of the 
plant, other than the radicle.  
2. They are meant for anchorage and 
absorption.  
2. They serve functions like storage, 
climbing and respiration. 
3. They are characteristic of grasses.  3. They are found in a variety of 
plants. 
4. They are usually present below the 
soil. 
4. They may be underground or 
aerial.  
 
OR 
 
In mango, the pericarp is well differentiated into an outer thin epicarp, a middle fleshy 
edible mesocarp and an inner endocarp which is stony and hard. 
 
 
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
12. Crossing over is the phenomenon of exchange of equivalent segments between non-
sister chromatids of homologous chromosomes during prophase I of meiosis.  
The enzyme recombinase is involved in the phenomenon of crossing over.    
 
SECTION C 
 
13.   
Intracellular Digestion Extracellular Digestion 
(i) It occurs within the cells. 
(ii) Only a few enzymes are associated 
with this digestion. 
(iii) It occurs in unicellular organisms 
and some lower organisms. 
 
(i) It occurs outside the cells in the 
cavity of the alimentary canal. 
(ii) A large number of digestive glands 
and enzymes are associated with 
this digestion. 
(iii) It occurs in multicellular 
organisms. 
 
14. In earthworm, four pairs of tubular hearts are present. 
The anterior two pairs of the hearts known as the lateral hearts lie in the 7
th
 and 9
th
 
segments, while the posterior pairs called latero-oesophageal hearts are situated in the 
12
th
 and 13
th
 segments. 
OR 
Exoskeleton of cockroach: 
? In cockroach, the exoskeleton is hard, chitinous and brown. 
? It is made of hardened plates called sclerites. 
? The sclerites present on the dorsal side are called tergites, and the ones present on 
the ventral side are sternites. 
? Tergites and sternites are joined to one another by a flexible, articular membrane 
called the arthrodial membrane. 
 
15. Digestive system of frog: 
 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
16. Modification of the root is a change in the shape, size, structure and normal functioning 
of the root to perform some secondary functions or a particular adaptation. 
(a) Banyan tree: In banyan trees, long roots develop from branches which go deep 
down to reach the ground to provide additional mechanical support to the banyan 
tree. This modification is called a prop root.  
(b) Turnip: In turnip, the root is modified to store extra food. This modification is called 
napiform fleshy tap root. 
(c) Mangrove trees: The roots of mangrove trees get modified into pneumatic 
structures to provide additional oxygen to the plant. This modification of roots is 
called respiratory roots or pneumatophores. 
 
17. Based on the number of amino and carboxyl groups, amino acids are of the following 
types: 
i. Acidic amino acids: These amino acids have an extra carboxylic group. Examples: 
Glutamic acid and aspartic acid 
ii. Basic amino acids: They have an additional amino group without forming amides. 
Examples: Arginine and lysine 
iii. Neutral amino acids: These amino acids have one amino group and one carboxylic 
group. Examples: Glycine and valine 
OR 
a. Cholesterol 
 
 
b. Uracil 
 
 
c. Triglyceride 
 
 
Page 5


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 8 Solution 
 
SECTION A 
 
1. Urochordates are also called tunicates because the adult body is enclosed within a 
leathery test or tunic formed of a cellulose-like organic substance termed tunicin. 
OR 
Parapodia are lateral appendages. They help in locomotion.  
 
2. A neem leaf is pinnately compound because its lamina is completely broken up into 
distinct segments or leaflets which are separately articulated at the base. 
 
3. Insulin 
 
4. It requires a membrane, a proton pump, a proton gradient and the enzyme ATPase. 
OR 
LHC is light harvesting complex. It is present in both photosystem I and photosystem II. 
 
5. Sebaceous glands (wax glands) 
 
SECTION B 
 
6. Bryophytes are called amphibians of the plant kingdom because they live in soil but 
require an external layer of water for their existence so that the male gametes can swim 
and reach the archegonia. 
 
7.   
i. In Amoeba, the contractile vacuole is involved in excretion and osmoregulation. 
ii. In protists, food vacuoles contain digestive enzymes which help digest nutrients. 
 
8. When pCO2 is high and pO2 is low as in the tissue, more binding of carbon dioxide with 
haemoglobin occurs, whereas when the pCO2 is low and pO2 is high as in the alveoli, 
dissociation of CO2 from carbaminohaemoglobin takes place. 
 
9. Emphysema is inflation or abnormal distension of the bronchioles or alveolar sacs of 
the lungs. As the alveolar septa collapse, the surface area for gas exchange is greatly 
reduced. 
Causes of emphysema: 
i. Cigarette smoking 
ii. Inhalation of other smoke or toxic substances over a period of time 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
OR 
? Amylase is secreted by salivary glands and pancreas.  
? Salivary glands secrete saliva which contains salivary amylase into the buccal cavity 
and converts starch to maltose.  
? The pancreas secretes pancreatic juice containing pancreatic amylase into the 
duodenum. It acts on starch and breaks it into maltose. 
 
10. Features of parasitic Platyhelminthes: 
? They have a thick cuticle. 
? They lack an alimentary canal and absorb the nutrients directly through their body 
surface. 
? They even show the presence of hooks and suckers.  
 
11. Differences between fibrous roots and adventitious roots: 
Fibrous roots Adventitious roots 
1. They arise from the radicle which 
becomes repeatedly branched and 
a tuft of roots arise from the base of 
the stem. 
1. They arise from any part of the 
plant, other than the radicle.  
2. They are meant for anchorage and 
absorption.  
2. They serve functions like storage, 
climbing and respiration. 
3. They are characteristic of grasses.  3. They are found in a variety of 
plants. 
4. They are usually present below the 
soil. 
4. They may be underground or 
aerial.  
 
OR 
 
In mango, the pericarp is well differentiated into an outer thin epicarp, a middle fleshy 
edible mesocarp and an inner endocarp which is stony and hard. 
 
 
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
12. Crossing over is the phenomenon of exchange of equivalent segments between non-
sister chromatids of homologous chromosomes during prophase I of meiosis.  
The enzyme recombinase is involved in the phenomenon of crossing over.    
 
SECTION C 
 
13.   
Intracellular Digestion Extracellular Digestion 
(i) It occurs within the cells. 
(ii) Only a few enzymes are associated 
with this digestion. 
(iii) It occurs in unicellular organisms 
and some lower organisms. 
 
(i) It occurs outside the cells in the 
cavity of the alimentary canal. 
(ii) A large number of digestive glands 
and enzymes are associated with 
this digestion. 
(iii) It occurs in multicellular 
organisms. 
 
14. In earthworm, four pairs of tubular hearts are present. 
The anterior two pairs of the hearts known as the lateral hearts lie in the 7
th
 and 9
th
 
segments, while the posterior pairs called latero-oesophageal hearts are situated in the 
12
th
 and 13
th
 segments. 
OR 
Exoskeleton of cockroach: 
? In cockroach, the exoskeleton is hard, chitinous and brown. 
? It is made of hardened plates called sclerites. 
? The sclerites present on the dorsal side are called tergites, and the ones present on 
the ventral side are sternites. 
? Tergites and sternites are joined to one another by a flexible, articular membrane 
called the arthrodial membrane. 
 
15. Digestive system of frog: 
 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
16. Modification of the root is a change in the shape, size, structure and normal functioning 
of the root to perform some secondary functions or a particular adaptation. 
(a) Banyan tree: In banyan trees, long roots develop from branches which go deep 
down to reach the ground to provide additional mechanical support to the banyan 
tree. This modification is called a prop root.  
(b) Turnip: In turnip, the root is modified to store extra food. This modification is called 
napiform fleshy tap root. 
(c) Mangrove trees: The roots of mangrove trees get modified into pneumatic 
structures to provide additional oxygen to the plant. This modification of roots is 
called respiratory roots or pneumatophores. 
 
17. Based on the number of amino and carboxyl groups, amino acids are of the following 
types: 
i. Acidic amino acids: These amino acids have an extra carboxylic group. Examples: 
Glutamic acid and aspartic acid 
ii. Basic amino acids: They have an additional amino group without forming amides. 
Examples: Arginine and lysine 
iii. Neutral amino acids: These amino acids have one amino group and one carboxylic 
group. Examples: Glycine and valine 
OR 
a. Cholesterol 
 
 
b. Uracil 
 
 
c. Triglyceride 
 
 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 8 Solution 
 
     
 
18.   
i. At several places, the nuclear envelope is interrupted by minute pores formed by 
the fusion of its two membranes; these pores are referred to as nuclear pores. 
 The nuclear pores serve as the passage for the movement of RNA and protein 
molecules in both directions between the nucleus and the cytoplasm. 
ii. Interkinesis is the short phase between meiosis I and meiosis II. 
 
19.  
i. Primary structure of protein: 
? The primary structure of protein gives positional information or information 
about the sequence of amino acids. 
? The left end of the protein chain is represented by the first amino acid (i.e. the N-
terminal amino acid) and the right end is represented by the last amino acid (i.e. 
the C-terminal amino acid). 
ii. Ribose and deoxyribose 
 
20. Glycolysis is the process of partial oxidation of glucose or a similar hexose sugar into 
two molecules of pyruvic acid through a series of ten enzyme-mediated reactions. 
The two monosaccharides are glucose and fructose which readily enter the glycolytic 
pathway. 
 
21. It is the synthesis of energy-rich ATP molecules with the help of energy liberated during 
oxidation of reduced coenzyme (NADH, FADH2) produced in respiration. 
The enzyme required for this synthesis is called ATP synthase (Complex V). 
ATP synthase is located in F1 or the headpiece of the F0 –F1 or elementary particle which 
is present in the inner mitochondrial membrane. 
 
22. Human beings have diphyodont (two sets of teeth —milk or deciduous and permanent), 
thecodont (teeth are embedded in sockets of the jaw bones) and heterodont teeth 
(different type of teeth). 
An adult human has 32 permanent teeth which are of four different types —incisors (I), 
canines (C), premolars (PM) and molars (M). 
The arrangement of teeth in each half of the upper and lower jaw in the order I, C, PM, 
M is represented by the dental formula. 
The dental formula in human beings is 2123. 
OR 
? The mucus secreted by the goblet cells of the intestinal mucosal epithelium and the 
secretions of the brush border cells of mucosa are together called succus entericus. 
? Enzymes present in the succus entericus act on the products formed during 
digestion, i.e. dipeptides, disaccharides, monoglycerides and nucleosides, to form 
simple absorbable products.