Class 11 Biology Sample Solution- 9 | Biology for Grade 11 PDF Download

 Page 1


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 9 Solution 
 
SECTION A 
 
1. Gelidium - Agar 
 
2. A leaf of silk cotton is palmately compound because the petiole bears leaflets at the tip 
of the petiole like the fingers of the palm. 
 
3. Metaphase is the best stage to study the morphology of chromosomes because the 
chromosomes are the shortest and thickest at this stage. 
OR 
Interphase is the longest phase of the cell cycle. 
 
4. It proves that chlorophyll is necessary for photosynthesis. 
 
5. Plasma without the clotting factors is called serum. 
OR 
Thrombin facilitates the conversion of fibrinogen to fibrin. 
 
SECTION B 
 
6. Haemocoel is a body cavity or pseudocoel filled with blood. It is found in Arthropods 
and Molluscs. 
 
7.   
 
Saturated Fats Unsaturated Fats 
i. They do not possess any double 
bonds in their fatty acids. 
ii. All carbon atoms are fully 
saturated. 
iii. They are solid at ordinary 
temperature. 
iv. Animal fats are mostly saturated 
fats. 
 
i. They contain one or more double 
bonds in their fatty acids. 
ii. Carbon atoms are unsaturated in the 
region of double bonds. 
iii. They are liquid at ordinary 
temperature. 
iv. Plant fats are generally unsaturated 
fats. 
 
OR 
Page 2


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 9 Solution 
 
SECTION A 
 
1. Gelidium - Agar 
 
2. A leaf of silk cotton is palmately compound because the petiole bears leaflets at the tip 
of the petiole like the fingers of the palm. 
 
3. Metaphase is the best stage to study the morphology of chromosomes because the 
chromosomes are the shortest and thickest at this stage. 
OR 
Interphase is the longest phase of the cell cycle. 
 
4. It proves that chlorophyll is necessary for photosynthesis. 
 
5. Plasma without the clotting factors is called serum. 
OR 
Thrombin facilitates the conversion of fibrinogen to fibrin. 
 
SECTION B 
 
6. Haemocoel is a body cavity or pseudocoel filled with blood. It is found in Arthropods 
and Molluscs. 
 
7.   
 
Saturated Fats Unsaturated Fats 
i. They do not possess any double 
bonds in their fatty acids. 
ii. All carbon atoms are fully 
saturated. 
iii. They are solid at ordinary 
temperature. 
iv. Animal fats are mostly saturated 
fats. 
 
i. They contain one or more double 
bonds in their fatty acids. 
ii. Carbon atoms are unsaturated in the 
region of double bonds. 
iii. They are liquid at ordinary 
temperature. 
iv. Plant fats are generally unsaturated 
fats. 
 
OR 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
Nucleic acids are long chain macromolecules which are formed by end to end 
polymerisation of a large number of repeated units called nucleotides.  
The two types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid 
(RNA). 
 
8.   
Tidal volume Residual volume 
i. It is the volume of air inspired 
or expired with each normal 
breath. 
ii. This is about 500 ml in an adult 
person. 
i. It is the volume of air which remains 
still in the lungs after the most 
forceful expiration. 
ii. It is about 100 ml to 1200 ml of air. 
 
9.   
(a) If repeated checks of blood pressure of an individual are 140/90 mmHg or higher, it 
is called hypertension. 
(b) Brain and kidneys 
 
10. Differences between syngamy and triple fusion: 
Syngamy Triple fusion 
? It is the process of fusion of a 
male gamete with the female 
gamete.  
? It is the process of fusion of two polar 
nuclei (into a secondary nucleus) and 
a male gamete in the embryo sac.  
? It results in the formation of a 
diploid zygote.  
? It results in a triploid primary 
endosperm nucleus (PEN). 
 
11. Functions of bones: 
? They provide place for attachment of muscles and help in movement and 
locomotion.  
? Bone marrow present in the bones acts as the site for the manufacture of blood cells. 
? Bones provide protection and support to the soft tissues and organs. 
? The long bones of the limbs have weight-bearing function. 
? They act as the depot of calcium and phosphorus.  
OR 
The 8
th
, 9
th
 and 10
th
 pairs of ribs are called false ribs. 
These three pairs of ribs do not articulate directly with the sternum. Instead they are 
joined to the 7
th
 pair by the hyaline cartilage. 
 
12. Mitochondria are called the powerhouse of the cell because they act as sites of aerobic 
respiration. They produce cellular energy in the form of ATP which helps to carry out 
several life processes.  
  
Page 3


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 9 Solution 
 
SECTION A 
 
1. Gelidium - Agar 
 
2. A leaf of silk cotton is palmately compound because the petiole bears leaflets at the tip 
of the petiole like the fingers of the palm. 
 
3. Metaphase is the best stage to study the morphology of chromosomes because the 
chromosomes are the shortest and thickest at this stage. 
OR 
Interphase is the longest phase of the cell cycle. 
 
4. It proves that chlorophyll is necessary for photosynthesis. 
 
5. Plasma without the clotting factors is called serum. 
OR 
Thrombin facilitates the conversion of fibrinogen to fibrin. 
 
SECTION B 
 
6. Haemocoel is a body cavity or pseudocoel filled with blood. It is found in Arthropods 
and Molluscs. 
 
7.   
 
Saturated Fats Unsaturated Fats 
i. They do not possess any double 
bonds in their fatty acids. 
ii. All carbon atoms are fully 
saturated. 
iii. They are solid at ordinary 
temperature. 
iv. Animal fats are mostly saturated 
fats. 
 
i. They contain one or more double 
bonds in their fatty acids. 
ii. Carbon atoms are unsaturated in the 
region of double bonds. 
iii. They are liquid at ordinary 
temperature. 
iv. Plant fats are generally unsaturated 
fats. 
 
OR 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
Nucleic acids are long chain macromolecules which are formed by end to end 
polymerisation of a large number of repeated units called nucleotides.  
The two types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid 
(RNA). 
 
8.   
Tidal volume Residual volume 
i. It is the volume of air inspired 
or expired with each normal 
breath. 
ii. This is about 500 ml in an adult 
person. 
i. It is the volume of air which remains 
still in the lungs after the most 
forceful expiration. 
ii. It is about 100 ml to 1200 ml of air. 
 
9.   
(a) If repeated checks of blood pressure of an individual are 140/90 mmHg or higher, it 
is called hypertension. 
(b) Brain and kidneys 
 
10. Differences between syngamy and triple fusion: 
Syngamy Triple fusion 
? It is the process of fusion of a 
male gamete with the female 
gamete.  
? It is the process of fusion of two polar 
nuclei (into a secondary nucleus) and 
a male gamete in the embryo sac.  
? It results in the formation of a 
diploid zygote.  
? It results in a triploid primary 
endosperm nucleus (PEN). 
 
11. Functions of bones: 
? They provide place for attachment of muscles and help in movement and 
locomotion.  
? Bone marrow present in the bones acts as the site for the manufacture of blood cells. 
? Bones provide protection and support to the soft tissues and organs. 
? The long bones of the limbs have weight-bearing function. 
? They act as the depot of calcium and phosphorus.  
OR 
The 8
th
, 9
th
 and 10
th
 pairs of ribs are called false ribs. 
These three pairs of ribs do not articulate directly with the sternum. Instead they are 
joined to the 7
th
 pair by the hyaline cartilage. 
 
12. Mitochondria are called the powerhouse of the cell because they act as sites of aerobic 
respiration. They produce cellular energy in the form of ATP which helps to carry out 
several life processes.  
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
SECTION C 
 
13. Sexual reproduction in fungi involves: 
i. Plasmogamy: Fusion of the protoplasm of the two fusing gametes/cells is called 
plasmogamy. 
ii. Karyogamy: It involves mixing of two nuclei of the fusing gametes/cells. It follows 
plasmogamy. 
iii. Meiosis: The diploid nucleus formed by karyogamy undergoes meiosis to produce 
haploid spores. 
OR 
Characteristics of virus similar to non-living objects: 
? Viruses do not have any specific cellular structure. 
? They do not have their own metabolism. 
? They show absence of growth. 
? Irritability is absent. 
? They can be crystallised. 
 
14.   
i. Cockroaches cause damage to household materials such as clothes, purses, shoes 
etc. They also eat and destroy human food such as bread, fruits, cheese etc. 
ii. They carry harmful germs of diseases such as diarrhoea, cholera, typhoid, 
tuberculosis etc. 
iii. Many animals such as amphibians (e.g. frogs, toads), lizards and birds eat 
cockroaches. Thus, they are part of the food chain. 
 
15. Modifications of the tap root for storage: 
i. Conical: The base of the root is broad and gradually tapers towards the apex. 
Example: Carrot 
ii. Fusiform: The fusiform fleshy root is like a spindle, i.e. thickest in the middle and 
narrow towards both base and apex. Example: Radish 
iii. Napiform: The fleshy root is very thick at the base and is almost spherical. It 
suddenly thins out towards the apex. Example: Turnip 
 
16.  
i. Spermathecal pores are four pairs of small openings situated ventro-laterally in the 
intersegmental grooves of the segments 5/6, 6/7, 7/8 and 8/9 on each side. Each 
opening leads into a spermatheca, in which the sperms of the other earthworm are 
stored. 
ii. Thirteen times 
 
  
Page 4


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 9 Solution 
 
SECTION A 
 
1. Gelidium - Agar 
 
2. A leaf of silk cotton is palmately compound because the petiole bears leaflets at the tip 
of the petiole like the fingers of the palm. 
 
3. Metaphase is the best stage to study the morphology of chromosomes because the 
chromosomes are the shortest and thickest at this stage. 
OR 
Interphase is the longest phase of the cell cycle. 
 
4. It proves that chlorophyll is necessary for photosynthesis. 
 
5. Plasma without the clotting factors is called serum. 
OR 
Thrombin facilitates the conversion of fibrinogen to fibrin. 
 
SECTION B 
 
6. Haemocoel is a body cavity or pseudocoel filled with blood. It is found in Arthropods 
and Molluscs. 
 
7.   
 
Saturated Fats Unsaturated Fats 
i. They do not possess any double 
bonds in their fatty acids. 
ii. All carbon atoms are fully 
saturated. 
iii. They are solid at ordinary 
temperature. 
iv. Animal fats are mostly saturated 
fats. 
 
i. They contain one or more double 
bonds in their fatty acids. 
ii. Carbon atoms are unsaturated in the 
region of double bonds. 
iii. They are liquid at ordinary 
temperature. 
iv. Plant fats are generally unsaturated 
fats. 
 
OR 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
Nucleic acids are long chain macromolecules which are formed by end to end 
polymerisation of a large number of repeated units called nucleotides.  
The two types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid 
(RNA). 
 
8.   
Tidal volume Residual volume 
i. It is the volume of air inspired 
or expired with each normal 
breath. 
ii. This is about 500 ml in an adult 
person. 
i. It is the volume of air which remains 
still in the lungs after the most 
forceful expiration. 
ii. It is about 100 ml to 1200 ml of air. 
 
9.   
(a) If repeated checks of blood pressure of an individual are 140/90 mmHg or higher, it 
is called hypertension. 
(b) Brain and kidneys 
 
10. Differences between syngamy and triple fusion: 
Syngamy Triple fusion 
? It is the process of fusion of a 
male gamete with the female 
gamete.  
? It is the process of fusion of two polar 
nuclei (into a secondary nucleus) and 
a male gamete in the embryo sac.  
? It results in the formation of a 
diploid zygote.  
? It results in a triploid primary 
endosperm nucleus (PEN). 
 
11. Functions of bones: 
? They provide place for attachment of muscles and help in movement and 
locomotion.  
? Bone marrow present in the bones acts as the site for the manufacture of blood cells. 
? Bones provide protection and support to the soft tissues and organs. 
? The long bones of the limbs have weight-bearing function. 
? They act as the depot of calcium and phosphorus.  
OR 
The 8
th
, 9
th
 and 10
th
 pairs of ribs are called false ribs. 
These three pairs of ribs do not articulate directly with the sternum. Instead they are 
joined to the 7
th
 pair by the hyaline cartilage. 
 
12. Mitochondria are called the powerhouse of the cell because they act as sites of aerobic 
respiration. They produce cellular energy in the form of ATP which helps to carry out 
several life processes.  
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
SECTION C 
 
13. Sexual reproduction in fungi involves: 
i. Plasmogamy: Fusion of the protoplasm of the two fusing gametes/cells is called 
plasmogamy. 
ii. Karyogamy: It involves mixing of two nuclei of the fusing gametes/cells. It follows 
plasmogamy. 
iii. Meiosis: The diploid nucleus formed by karyogamy undergoes meiosis to produce 
haploid spores. 
OR 
Characteristics of virus similar to non-living objects: 
? Viruses do not have any specific cellular structure. 
? They do not have their own metabolism. 
? They show absence of growth. 
? Irritability is absent. 
? They can be crystallised. 
 
14.   
i. Cockroaches cause damage to household materials such as clothes, purses, shoes 
etc. They also eat and destroy human food such as bread, fruits, cheese etc. 
ii. They carry harmful germs of diseases such as diarrhoea, cholera, typhoid, 
tuberculosis etc. 
iii. Many animals such as amphibians (e.g. frogs, toads), lizards and birds eat 
cockroaches. Thus, they are part of the food chain. 
 
15. Modifications of the tap root for storage: 
i. Conical: The base of the root is broad and gradually tapers towards the apex. 
Example: Carrot 
ii. Fusiform: The fusiform fleshy root is like a spindle, i.e. thickest in the middle and 
narrow towards both base and apex. Example: Radish 
iii. Napiform: The fleshy root is very thick at the base and is almost spherical. It 
suddenly thins out towards the apex. Example: Turnip 
 
16.  
i. Spermathecal pores are four pairs of small openings situated ventro-laterally in the 
intersegmental grooves of the segments 5/6, 6/7, 7/8 and 8/9 on each side. Each 
opening leads into a spermatheca, in which the sperms of the other earthworm are 
stored. 
ii. Thirteen times 
 
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
17. Significance of mitosis: 
i. Mitosis is essential for growth and development of a multicellular organism. 
ii. An efficient cell has a high nucleocytoplasmic ratio. An increase in size lowers the 
ratio. It is brought back to the efficient level through division. 
iii. Mitosis involves replication and equitable distribution of all the chromosomes so 
that all the cells of a multicellular organism have the same number and type of 
chromosomes. 
 
18.  
i.  
Primary Wall Secondary Wall 
i. The primary wall is laid inner to the 
middle lamella. 
ii. It is formed in growing cells. 
iii. It occurs in all plant cells. 
iv. It is comparatively thin 
   (0.1 –3 ? m) .
 
i. The secondary wall is laid inner to the 
primary wall. 
ii. It is formed when the cell has stopped 
growing. 
iii. It is found in some cells. 
iv. It is quite thick   ( 3 –10 
?
m). 
 
ii. It contains cell sap and helps to maintain the osmotic pressure of the cell. 
 
19.  
i. The highly extended and indistinct network of nucleoprotein fibres present in the 
nucleoplasm is called chromatin. 
The chromatin contains DNA and some basic proteins called histones, some non-
histone proteins and RNA. 
ii. S refers to sedimentation (or Svedberg) coefficient. 
OR 
Internal structure of a cilium/flagellum: 
 
Page 5


  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
CBSE 
Class XI Biology 
Sample Paper – 9 Solution 
 
SECTION A 
 
1. Gelidium - Agar 
 
2. A leaf of silk cotton is palmately compound because the petiole bears leaflets at the tip 
of the petiole like the fingers of the palm. 
 
3. Metaphase is the best stage to study the morphology of chromosomes because the 
chromosomes are the shortest and thickest at this stage. 
OR 
Interphase is the longest phase of the cell cycle. 
 
4. It proves that chlorophyll is necessary for photosynthesis. 
 
5. Plasma without the clotting factors is called serum. 
OR 
Thrombin facilitates the conversion of fibrinogen to fibrin. 
 
SECTION B 
 
6. Haemocoel is a body cavity or pseudocoel filled with blood. It is found in Arthropods 
and Molluscs. 
 
7.   
 
Saturated Fats Unsaturated Fats 
i. They do not possess any double 
bonds in their fatty acids. 
ii. All carbon atoms are fully 
saturated. 
iii. They are solid at ordinary 
temperature. 
iv. Animal fats are mostly saturated 
fats. 
 
i. They contain one or more double 
bonds in their fatty acids. 
ii. Carbon atoms are unsaturated in the 
region of double bonds. 
iii. They are liquid at ordinary 
temperature. 
iv. Plant fats are generally unsaturated 
fats. 
 
OR 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
Nucleic acids are long chain macromolecules which are formed by end to end 
polymerisation of a large number of repeated units called nucleotides.  
The two types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid 
(RNA). 
 
8.   
Tidal volume Residual volume 
i. It is the volume of air inspired 
or expired with each normal 
breath. 
ii. This is about 500 ml in an adult 
person. 
i. It is the volume of air which remains 
still in the lungs after the most 
forceful expiration. 
ii. It is about 100 ml to 1200 ml of air. 
 
9.   
(a) If repeated checks of blood pressure of an individual are 140/90 mmHg or higher, it 
is called hypertension. 
(b) Brain and kidneys 
 
10. Differences between syngamy and triple fusion: 
Syngamy Triple fusion 
? It is the process of fusion of a 
male gamete with the female 
gamete.  
? It is the process of fusion of two polar 
nuclei (into a secondary nucleus) and 
a male gamete in the embryo sac.  
? It results in the formation of a 
diploid zygote.  
? It results in a triploid primary 
endosperm nucleus (PEN). 
 
11. Functions of bones: 
? They provide place for attachment of muscles and help in movement and 
locomotion.  
? Bone marrow present in the bones acts as the site for the manufacture of blood cells. 
? Bones provide protection and support to the soft tissues and organs. 
? The long bones of the limbs have weight-bearing function. 
? They act as the depot of calcium and phosphorus.  
OR 
The 8
th
, 9
th
 and 10
th
 pairs of ribs are called false ribs. 
These three pairs of ribs do not articulate directly with the sternum. Instead they are 
joined to the 7
th
 pair by the hyaline cartilage. 
 
12. Mitochondria are called the powerhouse of the cell because they act as sites of aerobic 
respiration. They produce cellular energy in the form of ATP which helps to carry out 
several life processes.  
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
SECTION C 
 
13. Sexual reproduction in fungi involves: 
i. Plasmogamy: Fusion of the protoplasm of the two fusing gametes/cells is called 
plasmogamy. 
ii. Karyogamy: It involves mixing of two nuclei of the fusing gametes/cells. It follows 
plasmogamy. 
iii. Meiosis: The diploid nucleus formed by karyogamy undergoes meiosis to produce 
haploid spores. 
OR 
Characteristics of virus similar to non-living objects: 
? Viruses do not have any specific cellular structure. 
? They do not have their own metabolism. 
? They show absence of growth. 
? Irritability is absent. 
? They can be crystallised. 
 
14.   
i. Cockroaches cause damage to household materials such as clothes, purses, shoes 
etc. They also eat and destroy human food such as bread, fruits, cheese etc. 
ii. They carry harmful germs of diseases such as diarrhoea, cholera, typhoid, 
tuberculosis etc. 
iii. Many animals such as amphibians (e.g. frogs, toads), lizards and birds eat 
cockroaches. Thus, they are part of the food chain. 
 
15. Modifications of the tap root for storage: 
i. Conical: The base of the root is broad and gradually tapers towards the apex. 
Example: Carrot 
ii. Fusiform: The fusiform fleshy root is like a spindle, i.e. thickest in the middle and 
narrow towards both base and apex. Example: Radish 
iii. Napiform: The fleshy root is very thick at the base and is almost spherical. It 
suddenly thins out towards the apex. Example: Turnip 
 
16.  
i. Spermathecal pores are four pairs of small openings situated ventro-laterally in the 
intersegmental grooves of the segments 5/6, 6/7, 7/8 and 8/9 on each side. Each 
opening leads into a spermatheca, in which the sperms of the other earthworm are 
stored. 
ii. Thirteen times 
 
  
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
17. Significance of mitosis: 
i. Mitosis is essential for growth and development of a multicellular organism. 
ii. An efficient cell has a high nucleocytoplasmic ratio. An increase in size lowers the 
ratio. It is brought back to the efficient level through division. 
iii. Mitosis involves replication and equitable distribution of all the chromosomes so 
that all the cells of a multicellular organism have the same number and type of 
chromosomes. 
 
18.  
i.  
Primary Wall Secondary Wall 
i. The primary wall is laid inner to the 
middle lamella. 
ii. It is formed in growing cells. 
iii. It occurs in all plant cells. 
iv. It is comparatively thin 
   (0.1 –3 ? m) .
 
i. The secondary wall is laid inner to the 
primary wall. 
ii. It is formed when the cell has stopped 
growing. 
iii. It is found in some cells. 
iv. It is quite thick   ( 3 –10 
?
m). 
 
ii. It contains cell sap and helps to maintain the osmotic pressure of the cell. 
 
19.  
i. The highly extended and indistinct network of nucleoprotein fibres present in the 
nucleoplasm is called chromatin. 
The chromatin contains DNA and some basic proteins called histones, some non-
histone proteins and RNA. 
ii. S refers to sedimentation (or Svedberg) coefficient. 
OR 
Internal structure of a cilium/flagellum: 
 
  
 
CBSE XI  |  BIOLOGY 
Sample Paper – 9 Solution 
 
     
 
20.   
i. Pyruvic acid undergoes oxidative decarboxylation in which it first loses one carbon 
dioxide molecule and then undergoes oxidation in the presence of enzyme pyruvic 
dehydrogenase to form acetyl CoA. 
ii. Phosphofructokinase catalyses the phosphorylation of fructose 6-phospahte by ATP 
to form fructose 1, 6-biphosphate. 
iii. It is a wasteful process because 
(a) There is no synthesis of sugars or other energy-rich compounds such as ATP. 
(b) It consumes ATP and liberates photosynthetically fixed carbon dioxide. 
  
21.   
i. The pressure developed in the adsorbent or imbibant due to diffusion of water in it 
is known as imbibition pressure. 
ii. This pressure makes the seedlings to emerge from the soil during seed germination. 
iii. The nitrate formed by the process of nitrification is absorbed by plants and 
transported to the leaves where it is reduced to form ammonia. The reduced 
ammonia finally forms the amino group of amino acids. 
OR 
i. Complex III consists of cytochrome bc complex. It passes the electrons from 
ubiquinol to cytochrome c, which in turn, passes it to complex IV. 
ii.  
 
 
22.   
i. The cornea is the transparent portion which forms the anterior one-sixth of the 
eyeball. The cornea admits and helps to focus light waves as they enter the eye. 
ii. It extends from the ciliary body across the eyeball in front of the lens and has an 
opening in the centre called the pupil. It contains two types of smooth radial 
muscles which control the amount of light entering the eye.