Class 11 Biology Sample Solution- 1 | Biology Class 11 - NEET PDF Download

 Page 1


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 4 Solution 
 
SECTION A 
 
1.    
i. Marshy areas 
ii. Gut of ruminant mammals 
 
2. It stores food materials, resins, latex and mucilage. 
OR 
In the absence of a nucleus, functions of a sieve tube are maintained by the nucleus of 
companion cells. 
 
3. Pili and fimbriae 
 
4. Most plant nutrient elements are derived from rock minerals; hence, they are called 
mineral nutrients. 
 
5. Schwann cell 
OR 
(a) Sensory neurons 
(b) Motor neurons 
 
 
SECTION B 
 
6.   
i. Poisonous snakes: Naja (cobra), Bangarus (krait) and Vipera (viper) 
ii. They are included in Class Reptilia due to their crawling mode of locomotion. 
 
7.  
i. In Amoeba, the contractile vacuole is involved in excretion and osmoregulation. 
ii. In protists, food vacuoles contain digestive enzymes with the help of which 
nutrients are digested. 
OR 
Nucleic acids are long-chain macromolecules formed by polymerisation of a large 
number of repeated units called nucleotides. 
The two types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid 
(RNA). 
Page 2


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 4 Solution 
 
SECTION A 
 
1.    
i. Marshy areas 
ii. Gut of ruminant mammals 
 
2. It stores food materials, resins, latex and mucilage. 
OR 
In the absence of a nucleus, functions of a sieve tube are maintained by the nucleus of 
companion cells. 
 
3. Pili and fimbriae 
 
4. Most plant nutrient elements are derived from rock minerals; hence, they are called 
mineral nutrients. 
 
5. Schwann cell 
OR 
(a) Sensory neurons 
(b) Motor neurons 
 
 
SECTION B 
 
6.   
i. Poisonous snakes: Naja (cobra), Bangarus (krait) and Vipera (viper) 
ii. They are included in Class Reptilia due to their crawling mode of locomotion. 
 
7.  
i. In Amoeba, the contractile vacuole is involved in excretion and osmoregulation. 
ii. In protists, food vacuoles contain digestive enzymes with the help of which 
nutrients are digested. 
OR 
Nucleic acids are long-chain macromolecules formed by polymerisation of a large 
number of repeated units called nucleotides. 
The two types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid 
(RNA). 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
8. All minerals cannot be passively absorbed by the roots from the soil for two reasons: 
i. Minerals exist in the soil as ions which cannot directly cross the cell membranes. 
ii. The concentration of minerals in the soil is usually lower than the concentration of 
minerals in the root. 
 
9.  
Absorption Spectrum Action Spectrum 
It is a graph plotted with the 
amount of light absorbed as a 
function of wavelength. 
It is a graph plotted with the amount of 
photosynthesis (in terms of CO2 fixed 
or O2 liberated) as a function of 
wavelength. 
 
10. Metagenesis is the phenomenon of the alteration of generations. For example, in 
cnidarians, polyps produce medusa asexually and medusa produce polyps sexually.  
 
11. Difference between phellogen and phelloderm: 
Phellogen Phelloderm 
? It is a meristematic tissue and 
produces new cells. 
? It stores food materials. 
 
OR 
Study of plant anatomy is useful to us in the following ways: 
? To solve taxonomic problems 
? To identify the adulteration of spices, tea and tobacco by analysing the 
microstructure 
? To differentiate inferior quality wood from superior quality wood 
? To extract compounds for use as medicine 
 
12. Trihydroxy propane is commonly called glycerol.  
Structural formula: 
 
 
 
  
Page 3


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 4 Solution 
 
SECTION A 
 
1.    
i. Marshy areas 
ii. Gut of ruminant mammals 
 
2. It stores food materials, resins, latex and mucilage. 
OR 
In the absence of a nucleus, functions of a sieve tube are maintained by the nucleus of 
companion cells. 
 
3. Pili and fimbriae 
 
4. Most plant nutrient elements are derived from rock minerals; hence, they are called 
mineral nutrients. 
 
5. Schwann cell 
OR 
(a) Sensory neurons 
(b) Motor neurons 
 
 
SECTION B 
 
6.   
i. Poisonous snakes: Naja (cobra), Bangarus (krait) and Vipera (viper) 
ii. They are included in Class Reptilia due to their crawling mode of locomotion. 
 
7.  
i. In Amoeba, the contractile vacuole is involved in excretion and osmoregulation. 
ii. In protists, food vacuoles contain digestive enzymes with the help of which 
nutrients are digested. 
OR 
Nucleic acids are long-chain macromolecules formed by polymerisation of a large 
number of repeated units called nucleotides. 
The two types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid 
(RNA). 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
8. All minerals cannot be passively absorbed by the roots from the soil for two reasons: 
i. Minerals exist in the soil as ions which cannot directly cross the cell membranes. 
ii. The concentration of minerals in the soil is usually lower than the concentration of 
minerals in the root. 
 
9.  
Absorption Spectrum Action Spectrum 
It is a graph plotted with the 
amount of light absorbed as a 
function of wavelength. 
It is a graph plotted with the amount of 
photosynthesis (in terms of CO2 fixed 
or O2 liberated) as a function of 
wavelength. 
 
10. Metagenesis is the phenomenon of the alteration of generations. For example, in 
cnidarians, polyps produce medusa asexually and medusa produce polyps sexually.  
 
11. Difference between phellogen and phelloderm: 
Phellogen Phelloderm 
? It is a meristematic tissue and 
produces new cells. 
? It stores food materials. 
 
OR 
Study of plant anatomy is useful to us in the following ways: 
? To solve taxonomic problems 
? To identify the adulteration of spices, tea and tobacco by analysing the 
microstructure 
? To differentiate inferior quality wood from superior quality wood 
? To extract compounds for use as medicine 
 
12. Trihydroxy propane is commonly called glycerol.  
Structural formula: 
 
 
 
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
SECTION C 
13.  
(a) An animal which has two layers of cells in its early embryonic stage is called a 
diploblastic animal. 
(b) An animal which has three layers of cells in its early embryonic stage is called a 
triploblastic animal. 
(c) There is always scope for change and improvement; this leads to innovations. 
 
14. The gizzard follows the crop of the alimentary canal. 
It is a thick-walled somewhat rounded structure. Its walls are muscular and greatly 
folded. Its wall consists of strong circular muscles. The gizzard has six teeth which help 
in grinding food particles. 
OR 
Three types of cell junctions:  
? Tight junctions 
? Gap junctions 
? Adhering junctions 
Functions of junctions: 
? Tight junctions: To prevent the leaking of substances across a tissue 
? Gap junctions: To facilitate cells to communicate with each other by connecting 
their cytoplasm 
? Adhering junctions: To perform cementing of the adjacent cells to keep them 
together 
 
15.  
(a) It is called rachis. 
(b) The rachis represents the midrib. 
(c) A bud is present in the axil of a leaf, while a leaflet does not have a bud in its axil. 
 
16. Anatomical difference between monocot root and dicot root: 
i. Monocot root:      ii. Dicot root: 
 
          
  
Page 4


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 4 Solution 
 
SECTION A 
 
1.    
i. Marshy areas 
ii. Gut of ruminant mammals 
 
2. It stores food materials, resins, latex and mucilage. 
OR 
In the absence of a nucleus, functions of a sieve tube are maintained by the nucleus of 
companion cells. 
 
3. Pili and fimbriae 
 
4. Most plant nutrient elements are derived from rock minerals; hence, they are called 
mineral nutrients. 
 
5. Schwann cell 
OR 
(a) Sensory neurons 
(b) Motor neurons 
 
 
SECTION B 
 
6.   
i. Poisonous snakes: Naja (cobra), Bangarus (krait) and Vipera (viper) 
ii. They are included in Class Reptilia due to their crawling mode of locomotion. 
 
7.  
i. In Amoeba, the contractile vacuole is involved in excretion and osmoregulation. 
ii. In protists, food vacuoles contain digestive enzymes with the help of which 
nutrients are digested. 
OR 
Nucleic acids are long-chain macromolecules formed by polymerisation of a large 
number of repeated units called nucleotides. 
The two types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid 
(RNA). 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
8. All minerals cannot be passively absorbed by the roots from the soil for two reasons: 
i. Minerals exist in the soil as ions which cannot directly cross the cell membranes. 
ii. The concentration of minerals in the soil is usually lower than the concentration of 
minerals in the root. 
 
9.  
Absorption Spectrum Action Spectrum 
It is a graph plotted with the 
amount of light absorbed as a 
function of wavelength. 
It is a graph plotted with the amount of 
photosynthesis (in terms of CO2 fixed 
or O2 liberated) as a function of 
wavelength. 
 
10. Metagenesis is the phenomenon of the alteration of generations. For example, in 
cnidarians, polyps produce medusa asexually and medusa produce polyps sexually.  
 
11. Difference between phellogen and phelloderm: 
Phellogen Phelloderm 
? It is a meristematic tissue and 
produces new cells. 
? It stores food materials. 
 
OR 
Study of plant anatomy is useful to us in the following ways: 
? To solve taxonomic problems 
? To identify the adulteration of spices, tea and tobacco by analysing the 
microstructure 
? To differentiate inferior quality wood from superior quality wood 
? To extract compounds for use as medicine 
 
12. Trihydroxy propane is commonly called glycerol.  
Structural formula: 
 
 
 
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
SECTION C 
13.  
(a) An animal which has two layers of cells in its early embryonic stage is called a 
diploblastic animal. 
(b) An animal which has three layers of cells in its early embryonic stage is called a 
triploblastic animal. 
(c) There is always scope for change and improvement; this leads to innovations. 
 
14. The gizzard follows the crop of the alimentary canal. 
It is a thick-walled somewhat rounded structure. Its walls are muscular and greatly 
folded. Its wall consists of strong circular muscles. The gizzard has six teeth which help 
in grinding food particles. 
OR 
Three types of cell junctions:  
? Tight junctions 
? Gap junctions 
? Adhering junctions 
Functions of junctions: 
? Tight junctions: To prevent the leaking of substances across a tissue 
? Gap junctions: To facilitate cells to communicate with each other by connecting 
their cytoplasm 
? Adhering junctions: To perform cementing of the adjacent cells to keep them 
together 
 
15.  
(a) It is called rachis. 
(b) The rachis represents the midrib. 
(c) A bud is present in the axil of a leaf, while a leaflet does not have a bud in its axil. 
 
16. Anatomical difference between monocot root and dicot root: 
i. Monocot root:      ii. Dicot root: 
 
          
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
OR 
(a) The pericycle is located just inner to the endodermis. 
(b) The protoxylem elements are towards the outer surface, while the metaxylem 
elements are found towards the centre or pith. 
(c) Parenchyma cells constitute the cortex. 
 
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.    
(a) Synapsis: During zygotene of prophase I of meiosis, homologous chromosomes pair 
together. This pairing is called synapsis. 
 
 
(b) Bivalent: The complex formed by a pair of synapsed homologous chromosomes 
during zygotene of prophase I of meiosis is called a bivalent. 
 
 
(c) Chiasmata: During diplotene, the paired chromosomes make an X-shaped structure. 
This is called chiasmata. These are the sites where crossing over between two non-
sister chromatids occurs. 
 
 
Page 5


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 4 Solution 
 
SECTION A 
 
1.    
i. Marshy areas 
ii. Gut of ruminant mammals 
 
2. It stores food materials, resins, latex and mucilage. 
OR 
In the absence of a nucleus, functions of a sieve tube are maintained by the nucleus of 
companion cells. 
 
3. Pili and fimbriae 
 
4. Most plant nutrient elements are derived from rock minerals; hence, they are called 
mineral nutrients. 
 
5. Schwann cell 
OR 
(a) Sensory neurons 
(b) Motor neurons 
 
 
SECTION B 
 
6.   
i. Poisonous snakes: Naja (cobra), Bangarus (krait) and Vipera (viper) 
ii. They are included in Class Reptilia due to their crawling mode of locomotion. 
 
7.  
i. In Amoeba, the contractile vacuole is involved in excretion and osmoregulation. 
ii. In protists, food vacuoles contain digestive enzymes with the help of which 
nutrients are digested. 
OR 
Nucleic acids are long-chain macromolecules formed by polymerisation of a large 
number of repeated units called nucleotides. 
The two types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid 
(RNA). 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
8. All minerals cannot be passively absorbed by the roots from the soil for two reasons: 
i. Minerals exist in the soil as ions which cannot directly cross the cell membranes. 
ii. The concentration of minerals in the soil is usually lower than the concentration of 
minerals in the root. 
 
9.  
Absorption Spectrum Action Spectrum 
It is a graph plotted with the 
amount of light absorbed as a 
function of wavelength. 
It is a graph plotted with the amount of 
photosynthesis (in terms of CO2 fixed 
or O2 liberated) as a function of 
wavelength. 
 
10. Metagenesis is the phenomenon of the alteration of generations. For example, in 
cnidarians, polyps produce medusa asexually and medusa produce polyps sexually.  
 
11. Difference between phellogen and phelloderm: 
Phellogen Phelloderm 
? It is a meristematic tissue and 
produces new cells. 
? It stores food materials. 
 
OR 
Study of plant anatomy is useful to us in the following ways: 
? To solve taxonomic problems 
? To identify the adulteration of spices, tea and tobacco by analysing the 
microstructure 
? To differentiate inferior quality wood from superior quality wood 
? To extract compounds for use as medicine 
 
12. Trihydroxy propane is commonly called glycerol.  
Structural formula: 
 
 
 
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
SECTION C 
13.  
(a) An animal which has two layers of cells in its early embryonic stage is called a 
diploblastic animal. 
(b) An animal which has three layers of cells in its early embryonic stage is called a 
triploblastic animal. 
(c) There is always scope for change and improvement; this leads to innovations. 
 
14. The gizzard follows the crop of the alimentary canal. 
It is a thick-walled somewhat rounded structure. Its walls are muscular and greatly 
folded. Its wall consists of strong circular muscles. The gizzard has six teeth which help 
in grinding food particles. 
OR 
Three types of cell junctions:  
? Tight junctions 
? Gap junctions 
? Adhering junctions 
Functions of junctions: 
? Tight junctions: To prevent the leaking of substances across a tissue 
? Gap junctions: To facilitate cells to communicate with each other by connecting 
their cytoplasm 
? Adhering junctions: To perform cementing of the adjacent cells to keep them 
together 
 
15.  
(a) It is called rachis. 
(b) The rachis represents the midrib. 
(c) A bud is present in the axil of a leaf, while a leaflet does not have a bud in its axil. 
 
16. Anatomical difference between monocot root and dicot root: 
i. Monocot root:      ii. Dicot root: 
 
          
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
OR 
(a) The pericycle is located just inner to the endodermis. 
(b) The protoxylem elements are towards the outer surface, while the metaxylem 
elements are found towards the centre or pith. 
(c) Parenchyma cells constitute the cortex. 
 
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.    
(a) Synapsis: During zygotene of prophase I of meiosis, homologous chromosomes pair 
together. This pairing is called synapsis. 
 
 
(b) Bivalent: The complex formed by a pair of synapsed homologous chromosomes 
during zygotene of prophase I of meiosis is called a bivalent. 
 
 
(c) Chiasmata: During diplotene, the paired chromosomes make an X-shaped structure. 
This is called chiasmata. These are the sites where crossing over between two non-
sister chromatids occurs. 
 
 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 4 Solution 
 
     
 
19. Differences between plant cytokinesis and animal cytokinesis: 
Plant Cytokinesis Animal Cytokinesis 
(i) It occurs by cell plate formation. 
(ii) The cell plate appears at the centre 
and extends outwards. 
(iii) Fusion of vesicles begins cell plate 
formation. 
(i) It occurs by cleavage. 
(ii) Cleavage begins at the periphery and 
proceeds inwards. 
(iii) Cleavage is started by contraction of 
the peripheral ring of microfilaments. 
 
20. 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. 
OR 
? RuBisCO is present in the bundle sheath cells of C4 plants. 
? The mesophyll cells of C4 plants have a mechanism to concentrate the CO2 in the 
bundle sheath cells.  
? Since the concentration of CO2 in the bundle sheath is higher, RuBisCO functions as a 
carboxylase.  
 
21. The phenomenon involved is imbibition. 
Absorption of water by the solid particles of an adsorbent without forming a solution is 
called imbibition. 
The two conditions necessary are 
i. Water potential gradient between the adsorbent and the liquid/water imbibed. 
ii. Affinity between the adsorbent and the imbibed liquid. 
 
22. HCl converts pepsinogen (proenzyme) and prorennin (proenzyme) to pepsin and 
rennin. It provides the acidic pH (pH 1.8) which is optimal for pepsin. Rennin is a 
proteolytic enzyme found in the gastric juice of infants which helps in the digestion of 
milk proteins. So, without HCl, infants would not be able to digest milk proteins.  
HCl is also necessary to kill harmful bacteria which may be present in food. In the 
absence of HCl, harmful bacteria will not be killed and may cause diseases. 
 
23. The major plasma proteins are fibrinogens, globulins and albumins.  
Importance of plasma proteins: 
i. Fibrinogens help in the clotting or coagulation of blood.  
ii. Globulins, also called immunoglobulins, are involved in defence mechanisms of the 
body. 
iii. Albumins and globulins retain water and thus help in maintaining the osmotic 
balance. 
iv. Plasma proteins help in the uniform distribution of heat all over the body.