Class 11 Biology Sample Solution- 6 | Biology for Grade 11 PDF Download

 Page 1


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 6 Solution 
 
SECTION A 
 
1. A coelom which is completely lined with mesoderm is a true coelom. 
OR 
Arthropods have blood-filled haemocoel, and nematodes have fluid-filled pseudocoel. 
 
2. Oothecae are the capsules which enclose fertilised eggs. 
 
3. Cellulose is made of only one type of monomer (glucose); hence, it is called a 
homopolymer. 
 
4. Acetyl CoA 
OR 
? Pyruvic acid decarboxylase 
? Alcohol dehydrogenase 
 
5. Synaptic knob 
 
SECTION B 
 
6. Ferns which produce two kinds of spores—microspores and megaspores—are called 
heterosporous ferns. 
Examples: Selaginella, Salvinia 
 
7. Intestinal lumen and intestinal epithelial cells. 
The enzyme which digests fats is lipase. 
End-products of fat digestion are fatty acids and glycerol. 
 
8. The resting membrane is impermeable to the negatively charged proteins of the 
axoplasm. An active sodium pump transports three sodium ions to the outside, but two 
potassium ions come inside. 
 
9. Increase in the number of cells is referred to as growth. However, in unicellular 
organisms, increase in the number of cells occurs only though reproduction. Therefore, 
in unicellular organisms, reproduction results in an increase in the number of cells 
which in turn leads to growth.  
 
 
Page 2


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 6 Solution 
 
SECTION A 
 
1. A coelom which is completely lined with mesoderm is a true coelom. 
OR 
Arthropods have blood-filled haemocoel, and nematodes have fluid-filled pseudocoel. 
 
2. Oothecae are the capsules which enclose fertilised eggs. 
 
3. Cellulose is made of only one type of monomer (glucose); hence, it is called a 
homopolymer. 
 
4. Acetyl CoA 
OR 
? Pyruvic acid decarboxylase 
? Alcohol dehydrogenase 
 
5. Synaptic knob 
 
SECTION B 
 
6. Ferns which produce two kinds of spores—microspores and megaspores—are called 
heterosporous ferns. 
Examples: Selaginella, Salvinia 
 
7. Intestinal lumen and intestinal epithelial cells. 
The enzyme which digests fats is lipase. 
End-products of fat digestion are fatty acids and glycerol. 
 
8. The resting membrane is impermeable to the negatively charged proteins of the 
axoplasm. An active sodium pump transports three sodium ions to the outside, but two 
potassium ions come inside. 
 
9. Increase in the number of cells is referred to as growth. However, in unicellular 
organisms, increase in the number of cells occurs only though reproduction. Therefore, 
in unicellular organisms, reproduction results in an increase in the number of cells 
which in turn leads to growth.  
 
 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
10. Differences between chromatin and chromosomes: 
Chromatin Chromosomes 
i. It is active in controlling 
metabolism and other activities of 
the cell. 
ii. Chromatin is observable in the 
interphase nucleus. 
iii. Chromatin is in the form of fine 
fibrils which run throughout the 
nucleus. 
iv. Replication occurs in the 
chromatin phase. 
i. Chromosomes are meant for the 
distribution of genetic 
information to the daughter cells. 
ii. Chromosomes are observable 
during the M-phase or at nuclear 
division. 
iii. Chromosomes are in the form of 
short thick threads or rods. 
iv. Replication cannot occur in the 
chromosome phase. 
 
OR 
i. Functions of polysaccharides: 
(a) Starch and glycogen are the storage foods in most of the living organisms. 
(b) Chitin is the structural carbohydrate of fungal walls and exoskeleton of 
arthropods. 
ii. Functions of amino acids: 
(a) Amino acids are building blocks of proteins and enzymes. 
(b) The amino acid glycine provides nitrogen and carbon atoms for the synthesis of 
protoporphyrin and haeme. 
  
11. Differences between adipose tissue and blood tissue: 
Adipose tissue Blood tissue 
? It is a loose connective tissue. ? It is a fluid connective tissue. 
? The matrix has fibres. ? The matrix does not have fibres. 
? It helps in storage and metabolism 
of fats. 
? It helps in circulation of various 
substances and respiratory gases.  
 
12. Structure of  mitochondrion: 
 
Page 3


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 6 Solution 
 
SECTION A 
 
1. A coelom which is completely lined with mesoderm is a true coelom. 
OR 
Arthropods have blood-filled haemocoel, and nematodes have fluid-filled pseudocoel. 
 
2. Oothecae are the capsules which enclose fertilised eggs. 
 
3. Cellulose is made of only one type of monomer (glucose); hence, it is called a 
homopolymer. 
 
4. Acetyl CoA 
OR 
? Pyruvic acid decarboxylase 
? Alcohol dehydrogenase 
 
5. Synaptic knob 
 
SECTION B 
 
6. Ferns which produce two kinds of spores—microspores and megaspores—are called 
heterosporous ferns. 
Examples: Selaginella, Salvinia 
 
7. Intestinal lumen and intestinal epithelial cells. 
The enzyme which digests fats is lipase. 
End-products of fat digestion are fatty acids and glycerol. 
 
8. The resting membrane is impermeable to the negatively charged proteins of the 
axoplasm. An active sodium pump transports three sodium ions to the outside, but two 
potassium ions come inside. 
 
9. Increase in the number of cells is referred to as growth. However, in unicellular 
organisms, increase in the number of cells occurs only though reproduction. Therefore, 
in unicellular organisms, reproduction results in an increase in the number of cells 
which in turn leads to growth.  
 
 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
10. Differences between chromatin and chromosomes: 
Chromatin Chromosomes 
i. It is active in controlling 
metabolism and other activities of 
the cell. 
ii. Chromatin is observable in the 
interphase nucleus. 
iii. Chromatin is in the form of fine 
fibrils which run throughout the 
nucleus. 
iv. Replication occurs in the 
chromatin phase. 
i. Chromosomes are meant for the 
distribution of genetic 
information to the daughter cells. 
ii. Chromosomes are observable 
during the M-phase or at nuclear 
division. 
iii. Chromosomes are in the form of 
short thick threads or rods. 
iv. Replication cannot occur in the 
chromosome phase. 
 
OR 
i. Functions of polysaccharides: 
(a) Starch and glycogen are the storage foods in most of the living organisms. 
(b) Chitin is the structural carbohydrate of fungal walls and exoskeleton of 
arthropods. 
ii. Functions of amino acids: 
(a) Amino acids are building blocks of proteins and enzymes. 
(b) The amino acid glycine provides nitrogen and carbon atoms for the synthesis of 
protoporphyrin and haeme. 
  
11. Differences between adipose tissue and blood tissue: 
Adipose tissue Blood tissue 
? It is a loose connective tissue. ? It is a fluid connective tissue. 
? The matrix has fibres. ? The matrix does not have fibres. 
? It helps in storage and metabolism 
of fats. 
? It helps in circulation of various 
substances and respiratory gases.  
 
12. Structure of  mitochondrion: 
 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
OR 
Functions of the cytoskeleton: 
? It provides mechanical support and motility to the cell. 
? It maintains the shape of the cell. 
 
SECTION C 
 
13.  Double fertilisation is unique to angiosperms. 
In this phenomenon, two male gametes are discharged by a pollen tube into the embryo 
sac of an ovule. One male gamete fuses with the female gamete to form a zygote. This 
fusion is called syngamy. A second male gamete fuses with the secondary nucleus to 
form the primary endosperm nucleus. This is called double fertilisation.  
OR 
In Ulothrix, reproduction may occur by the following methods: 
? Vegetative reproduction by fragmentation or by formation of different types of 
spores. 
? Asexual reproduction by flagellated zoospores. 
? Sexual reproduction by the isogamous, anisogamous or oogamous fusion of 
gametes. 
 
14.  Frogs have two well-developed portal systems—hepatic portal system and renal portal 
system. 
The hepatic portal system is the connection between the liver and the intestine through 
veins, while the renal portal system is the connection between the kidneys and the 
lower parts of the body such as limbs, via veins, to remove nitrogenous wastes. 
  
15.  It is true that the cork cambium forms tissues which form the cork. The cork cambium 
produces new cells on both outer surface and inner surface. The cells formed on the 
outer side differentiate into cork, also called phellem. These cells become impervious to 
water due to deposition of suberin and become thick-walled. 
 
16.  Differences between pinnately compound leaf and palmately compound leaf: 
Pinnately Compound Leaf Palmately Compound Leaf 
i. Several leaflets are present on a 
common axis. 
ii. The shape of the leaflets appears 
feather-like. 
iii. The leaflet-bearing axis is the 
continuation of the petiole or 
modified mid-rib. It is prominent. 
Example:  Neem leaves 
i. The number of leaflets is attached at a 
common point. 
ii. The shape of the leaflets appears like 
the palm. 
iii. The leaflet-bearing axis is very short 
and represents the tip of the petiole. 
It is not prominent. Example:  Cotton 
leaves 
Page 4


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 6 Solution 
 
SECTION A 
 
1. A coelom which is completely lined with mesoderm is a true coelom. 
OR 
Arthropods have blood-filled haemocoel, and nematodes have fluid-filled pseudocoel. 
 
2. Oothecae are the capsules which enclose fertilised eggs. 
 
3. Cellulose is made of only one type of monomer (glucose); hence, it is called a 
homopolymer. 
 
4. Acetyl CoA 
OR 
? Pyruvic acid decarboxylase 
? Alcohol dehydrogenase 
 
5. Synaptic knob 
 
SECTION B 
 
6. Ferns which produce two kinds of spores—microspores and megaspores—are called 
heterosporous ferns. 
Examples: Selaginella, Salvinia 
 
7. Intestinal lumen and intestinal epithelial cells. 
The enzyme which digests fats is lipase. 
End-products of fat digestion are fatty acids and glycerol. 
 
8. The resting membrane is impermeable to the negatively charged proteins of the 
axoplasm. An active sodium pump transports three sodium ions to the outside, but two 
potassium ions come inside. 
 
9. Increase in the number of cells is referred to as growth. However, in unicellular 
organisms, increase in the number of cells occurs only though reproduction. Therefore, 
in unicellular organisms, reproduction results in an increase in the number of cells 
which in turn leads to growth.  
 
 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
10. Differences between chromatin and chromosomes: 
Chromatin Chromosomes 
i. It is active in controlling 
metabolism and other activities of 
the cell. 
ii. Chromatin is observable in the 
interphase nucleus. 
iii. Chromatin is in the form of fine 
fibrils which run throughout the 
nucleus. 
iv. Replication occurs in the 
chromatin phase. 
i. Chromosomes are meant for the 
distribution of genetic 
information to the daughter cells. 
ii. Chromosomes are observable 
during the M-phase or at nuclear 
division. 
iii. Chromosomes are in the form of 
short thick threads or rods. 
iv. Replication cannot occur in the 
chromosome phase. 
 
OR 
i. Functions of polysaccharides: 
(a) Starch and glycogen are the storage foods in most of the living organisms. 
(b) Chitin is the structural carbohydrate of fungal walls and exoskeleton of 
arthropods. 
ii. Functions of amino acids: 
(a) Amino acids are building blocks of proteins and enzymes. 
(b) The amino acid glycine provides nitrogen and carbon atoms for the synthesis of 
protoporphyrin and haeme. 
  
11. Differences between adipose tissue and blood tissue: 
Adipose tissue Blood tissue 
? It is a loose connective tissue. ? It is a fluid connective tissue. 
? The matrix has fibres. ? The matrix does not have fibres. 
? It helps in storage and metabolism 
of fats. 
? It helps in circulation of various 
substances and respiratory gases.  
 
12. Structure of  mitochondrion: 
 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
OR 
Functions of the cytoskeleton: 
? It provides mechanical support and motility to the cell. 
? It maintains the shape of the cell. 
 
SECTION C 
 
13.  Double fertilisation is unique to angiosperms. 
In this phenomenon, two male gametes are discharged by a pollen tube into the embryo 
sac of an ovule. One male gamete fuses with the female gamete to form a zygote. This 
fusion is called syngamy. A second male gamete fuses with the secondary nucleus to 
form the primary endosperm nucleus. This is called double fertilisation.  
OR 
In Ulothrix, reproduction may occur by the following methods: 
? Vegetative reproduction by fragmentation or by formation of different types of 
spores. 
? Asexual reproduction by flagellated zoospores. 
? Sexual reproduction by the isogamous, anisogamous or oogamous fusion of 
gametes. 
 
14.  Frogs have two well-developed portal systems—hepatic portal system and renal portal 
system. 
The hepatic portal system is the connection between the liver and the intestine through 
veins, while the renal portal system is the connection between the kidneys and the 
lower parts of the body such as limbs, via veins, to remove nitrogenous wastes. 
  
15.  It is true that the cork cambium forms tissues which form the cork. The cork cambium 
produces new cells on both outer surface and inner surface. The cells formed on the 
outer side differentiate into cork, also called phellem. These cells become impervious to 
water due to deposition of suberin and become thick-walled. 
 
16.  Differences between pinnately compound leaf and palmately compound leaf: 
Pinnately Compound Leaf Palmately Compound Leaf 
i. Several leaflets are present on a 
common axis. 
ii. The shape of the leaflets appears 
feather-like. 
iii. The leaflet-bearing axis is the 
continuation of the petiole or 
modified mid-rib. It is prominent. 
Example:  Neem leaves 
i. The number of leaflets is attached at a 
common point. 
ii. The shape of the leaflets appears like 
the palm. 
iii. The leaflet-bearing axis is very short 
and represents the tip of the petiole. 
It is not prominent. Example:  Cotton 
leaves 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
17. The cell wall is a non-living rigid structure which forms an outer covering for the 
plasma membrane of fungi, plants and some protists. 
Functions of the cell wall: 
(a) Protects the protoplasm against mechanical injury and infection 
(b) Provides rigidity and shape to the cell 
(c) Helps in cell-to-cell interactions 
(d) Acts as a barrier to unwanted molecules 
 
18.  
 
 
OR 
Division of labour is the differentiation of certain parts of the cell to carry out different 
functions for increased efficiency and higher survival. In unicellular organisms, a single 
cell performs all the metabolic activities. In multicellular organisms, distinct organs and 
organ systems are meant to carry out distinct metabolic activities. In the human body, 
there is a separate system to carry out functions such as digestion, respiration, 
excretion and locomotion. Even in a particular system, there are different organs for 
different functions. For example, in the digestive system, the teeth and mouth are 
responsible for mastication. The stomach is responsible for killing the bacteria in the 
food. The small intestine is responsible for digestion and absorption.  
Thus, multicellular organisms have division of labour. 
 
19.  
i. Metaphase  
ii. Anaphase  
iii. Zygotene stage of prophase-I during meiosis 
 
20. A photosystem is a group of pigments which are involved in photosynthesis. These 
pigment systems have a reaction centre to which light energy absorbed by the 
accessory pigments is passed. There are two photosystems—I and II. 
A chlorophyll a molecule acts as the reaction centre. It is called P700 in PS I and P680 in 
PS II. 
 
Page 5


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 6 Solution 
 
SECTION A 
 
1. A coelom which is completely lined with mesoderm is a true coelom. 
OR 
Arthropods have blood-filled haemocoel, and nematodes have fluid-filled pseudocoel. 
 
2. Oothecae are the capsules which enclose fertilised eggs. 
 
3. Cellulose is made of only one type of monomer (glucose); hence, it is called a 
homopolymer. 
 
4. Acetyl CoA 
OR 
? Pyruvic acid decarboxylase 
? Alcohol dehydrogenase 
 
5. Synaptic knob 
 
SECTION B 
 
6. Ferns which produce two kinds of spores—microspores and megaspores—are called 
heterosporous ferns. 
Examples: Selaginella, Salvinia 
 
7. Intestinal lumen and intestinal epithelial cells. 
The enzyme which digests fats is lipase. 
End-products of fat digestion are fatty acids and glycerol. 
 
8. The resting membrane is impermeable to the negatively charged proteins of the 
axoplasm. An active sodium pump transports three sodium ions to the outside, but two 
potassium ions come inside. 
 
9. Increase in the number of cells is referred to as growth. However, in unicellular 
organisms, increase in the number of cells occurs only though reproduction. Therefore, 
in unicellular organisms, reproduction results in an increase in the number of cells 
which in turn leads to growth.  
 
 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
10. Differences between chromatin and chromosomes: 
Chromatin Chromosomes 
i. It is active in controlling 
metabolism and other activities of 
the cell. 
ii. Chromatin is observable in the 
interphase nucleus. 
iii. Chromatin is in the form of fine 
fibrils which run throughout the 
nucleus. 
iv. Replication occurs in the 
chromatin phase. 
i. Chromosomes are meant for the 
distribution of genetic 
information to the daughter cells. 
ii. Chromosomes are observable 
during the M-phase or at nuclear 
division. 
iii. Chromosomes are in the form of 
short thick threads or rods. 
iv. Replication cannot occur in the 
chromosome phase. 
 
OR 
i. Functions of polysaccharides: 
(a) Starch and glycogen are the storage foods in most of the living organisms. 
(b) Chitin is the structural carbohydrate of fungal walls and exoskeleton of 
arthropods. 
ii. Functions of amino acids: 
(a) Amino acids are building blocks of proteins and enzymes. 
(b) The amino acid glycine provides nitrogen and carbon atoms for the synthesis of 
protoporphyrin and haeme. 
  
11. Differences between adipose tissue and blood tissue: 
Adipose tissue Blood tissue 
? It is a loose connective tissue. ? It is a fluid connective tissue. 
? The matrix has fibres. ? The matrix does not have fibres. 
? It helps in storage and metabolism 
of fats. 
? It helps in circulation of various 
substances and respiratory gases.  
 
12. Structure of  mitochondrion: 
 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
OR 
Functions of the cytoskeleton: 
? It provides mechanical support and motility to the cell. 
? It maintains the shape of the cell. 
 
SECTION C 
 
13.  Double fertilisation is unique to angiosperms. 
In this phenomenon, two male gametes are discharged by a pollen tube into the embryo 
sac of an ovule. One male gamete fuses with the female gamete to form a zygote. This 
fusion is called syngamy. A second male gamete fuses with the secondary nucleus to 
form the primary endosperm nucleus. This is called double fertilisation.  
OR 
In Ulothrix, reproduction may occur by the following methods: 
? Vegetative reproduction by fragmentation or by formation of different types of 
spores. 
? Asexual reproduction by flagellated zoospores. 
? Sexual reproduction by the isogamous, anisogamous or oogamous fusion of 
gametes. 
 
14.  Frogs have two well-developed portal systems—hepatic portal system and renal portal 
system. 
The hepatic portal system is the connection between the liver and the intestine through 
veins, while the renal portal system is the connection between the kidneys and the 
lower parts of the body such as limbs, via veins, to remove nitrogenous wastes. 
  
15.  It is true that the cork cambium forms tissues which form the cork. The cork cambium 
produces new cells on both outer surface and inner surface. The cells formed on the 
outer side differentiate into cork, also called phellem. These cells become impervious to 
water due to deposition of suberin and become thick-walled. 
 
16.  Differences between pinnately compound leaf and palmately compound leaf: 
Pinnately Compound Leaf Palmately Compound Leaf 
i. Several leaflets are present on a 
common axis. 
ii. The shape of the leaflets appears 
feather-like. 
iii. The leaflet-bearing axis is the 
continuation of the petiole or 
modified mid-rib. It is prominent. 
Example:  Neem leaves 
i. The number of leaflets is attached at a 
common point. 
ii. The shape of the leaflets appears like 
the palm. 
iii. The leaflet-bearing axis is very short 
and represents the tip of the petiole. 
It is not prominent. Example:  Cotton 
leaves 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
17. The cell wall is a non-living rigid structure which forms an outer covering for the 
plasma membrane of fungi, plants and some protists. 
Functions of the cell wall: 
(a) Protects the protoplasm against mechanical injury and infection 
(b) Provides rigidity and shape to the cell 
(c) Helps in cell-to-cell interactions 
(d) Acts as a barrier to unwanted molecules 
 
18.  
 
 
OR 
Division of labour is the differentiation of certain parts of the cell to carry out different 
functions for increased efficiency and higher survival. In unicellular organisms, a single 
cell performs all the metabolic activities. In multicellular organisms, distinct organs and 
organ systems are meant to carry out distinct metabolic activities. In the human body, 
there is a separate system to carry out functions such as digestion, respiration, 
excretion and locomotion. Even in a particular system, there are different organs for 
different functions. For example, in the digestive system, the teeth and mouth are 
responsible for mastication. The stomach is responsible for killing the bacteria in the 
food. The small intestine is responsible for digestion and absorption.  
Thus, multicellular organisms have division of labour. 
 
19.  
i. Metaphase  
ii. Anaphase  
iii. Zygotene stage of prophase-I during meiosis 
 
20. A photosystem is a group of pigments which are involved in photosynthesis. These 
pigment systems have a reaction centre to which light energy absorbed by the 
accessory pigments is passed. There are two photosystems—I and II. 
A chlorophyll a molecule acts as the reaction centre. It is called P700 in PS I and P680 in 
PS II. 
 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 6 Solution 
 
     
 
21. Cretinism is a disorder caused by the deficiency of thyroid hormone (hypothyroidism) 
in infants. 
Causes: 
i. Failure of the thyroid gland to secrete thyroxine 
ii. Hyposecretion of thyrotropin-releasing hormone (TRH) 
OR 
Action of the hormone oestrogen: 
 
 
22.  
i. Arthritis. It is caused by the inflammation of the joints. It is a common disease in old 
age which includes pain and stiffness in the joints. 
ii. Sprain. It refers to an injury to a joint capsule which involves stretching or tearing of 
tendons or ligaments. This condition may often remain for a week or may take more 
time. Thus, it may become chronic. 
iii. Osteoporosis. It results from excessive resorption of calcium and phosphorus from 
the bones and leads to more chances of fractures. The major causes of this disorder 
are imbalances of hormones (such as calcitonin of thyroid, parathormone of 
parathyroids and sex hormones) and deficiency of vitamin D. 
 
23. Factors affecting the rate of diffusion: 
i. Temperature: The rate of diffusion increases with the increase in temperature 
because the kinetic energy of diffusing particles also increases with increasing 
temperature. 
ii. Density of diffusing substance: The rate of diffusion is inversely proportional to the 
square root of the density of the diffusing substance. 
iii. Medium in which diffusion occurs: The rate of diffusion decreases in a concentrated 
medium. Example: A gas diffuses more rapidly through vacuum than air.