Annelida

Annelida is composed of two words i.e. annulus which means ring and eidos which means form. This note contain information which include general characteristic features, classification of phylum Annelida.

Summary

Annelida is composed of two words i.e. annulus which means ring and eidos which means form. This note contain information which include general characteristic features, classification of phylum Annelida.

Things to Remember

  •  Lamarck coined the term Annelida.
  • They are elongated and metamerically segmented.
  • They are mostly aquatic and some are terrestrial and burrowing.Few are ectoparasites sucking the blood from vertebrates.
  • Respiration takes place through a moist body surface by diffusion.
  • Blood vascular system is closed type consisting of hearts and blood vessels.
  • Annelida is classified into four classes on the basis of locomotory organs.

 

MCQs

No MCQs found.

Subjective Questions

Q1:

Find the mode of the following data:

2, 3, 3, 2, 4, 5, 6, 3, 3, 5, 5, 4, 3, 2


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Given data</p> <p>2, 3, 3, 2, 4, 5, 6, 3, 3, 5, 5, 4, 3, 2</p> <p>By putting the list in order:</p> <p>2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 5, 5, 5, 6</p> <p>Here, 3 appears 5 times</p> <p>So, (M<sub>o</sub>) = 3</p>

Q2:

Find the mode of the following data:

3, 7, 9, 8, 8, 9, 8, 6, 5, 8

 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Given data</p> <p>3, 5, 6, 7, 8, 8, 8, 8, 9, 9</p> <p>Here, 8 appears 4 times,</p> <p>So, (M<sub>o</sub>) = 8</p>

Q3:

From the frequency table find the mean:

Marks(obtained) 5  10 15 20 25 30 35 40 45
No. of student 2 6 7 9 11 5 15 2 3

Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="175"><tbody><tr><td>Marks(obtained)</td> <td>No. of students</td> </tr><tr><td>5</td> <td>2</td> </tr><tr><td>10</td> <td>6</td> </tr><tr><td>15</td> <td>7</td> </tr><tr><td>20</td> <td>9</td> </tr><tr><td>25</td> <td>11</td> </tr><tr><td>30</td> <td>5</td> </tr><tr><td>35</td> <td>15</td> </tr><tr><td>40</td> <td>2</td> </tr><tr><td>45</td> <td>3</td> </tr></tbody></table><p>Here, from the data the highest frequency is 15 whose marks is 35.</p> <p>So, Mode(M<sub>o</sub>)=35</p>

Q4:

From the frequency table find the mean:

Wages(Rs) 50  75  100  125  150  175  200  225 
No of labours 8 12 17 29 11 27 20 30

Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width=""><tbody><tr><td>Wages(Rs)</td> <td>No of labours</td> </tr><tr><td>50</td> <td>8</td> </tr><tr><td>75</td> <td>12</td> </tr><tr><td>100</td> <td>17</td> </tr><tr><td>125</td> <td>29</td> </tr><tr><td>150</td> <td>11</td> </tr><tr><td>175</td> <td>27</td> </tr><tr><td>200</td> <td>20</td> </tr><tr><td>225</td> <td>30</td> </tr></tbody></table><p>Here, from the data the highest frequency is 30 which wages is 225.</p> <p>So, Mode(M<sub>o</sub>)=225.</p>

Q5:

From the frequency table find the mean:

x  10  12  14  16  18  20  22  24  26 
f 7 3 9 8 12 5 9 11 8

Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="76"><tbody><tr><td>x</td> <td>f</td> </tr><tr><td>10</td> <td>7</td> </tr><tr><td>12</td> <td>3</td> </tr><tr><td>14</td> <td>9</td> </tr><tr><td>16</td> <td>8</td> </tr><tr><td>18</td> <td>12</td> </tr><tr><td>20</td> <td>5</td> </tr><tr><td>22</td> <td>9</td> </tr><tr><td>24</td> <td>11</td> </tr><tr><td>26</td> <td>8</td> </tr></tbody></table><p>Here, from the data the highest frequency is 12 which wages is 18</p> <p>So, Mode(M<sub>o</sub>)=18</p> <p></p>

Q6:

From the frequency table find the mean:

Marks obtained 0  5  10  15  20  25  30  35 
No of students 2 9 15 9 19 21 30 20

 


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="81"><tbody><tr><td>Marks obtained</td> <td>No of students</td> </tr><tr><td>0</td> <td>2</td> </tr><tr><td>5</td> <td>9</td> </tr><tr><td>10</td> <td>15</td> </tr><tr><td>15</td> <td>9</td> </tr><tr><td>20</td> <td>19</td> </tr><tr><td>25</td> <td>21</td> </tr><tr><td>30</td> <td>30</td> </tr><tr><td>35</td> <td>20</td> </tr></tbody></table><p>Here, from the data the highest frequency is 30 whose marks is 30</p> <p>So, Mode(M<sub>o</sub>)=30</p> <p></p> <p></p>

Q7:

Find the mode of the following data:

29cm, 34cm, 29cm, 26cm, 55cm, 34cm, 35cm, 40cm , 34cm, 56cm

 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Given data</p> <p>29cm, 34cm, 29cm, 26cm, 55cm, 34cm, 35cm, 40cm , 34cm, 56cm</p> <p>By putting the list in order:</p> <p>26cm, 29cm, 29cm, 34cm, 34cm, 34cm, 35cm , 40cm, 55cm, 56cm</p> <p>Here 34 cm appears 3 times</p> <p>So, Mode(M<sub>o</sub>)=34 cm</p> <p></p>

Q8:

Find the mode of the following data:

 120, 125, 130, 125, 120, 135, 120, 140


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Given data</p> <p>120, 125, 130, 125, 120, 135, 120, 140</p> <p>By putting the list in order:</p> <p>120, 120, 120, 125, 125, 130, 135, 140</p> <p>Here 120 appears 3 times</p> <p>So, Mode(M<sub>o</sub>) =120</p>

Q9:

Find the mode of the following data: 

99kg, 135kg, 182kg, 49kg, 189kg, 196kg, 78kg, 192kg, 182kg


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Given data</p> <p>99kg, 135kg, 182kg, 49kg, 189kg, 196kg, 78kg, 192kg, 182kg</p> <p>By putting the list in order:</p> <p>49kg, 78kg, 99kg, 135kg, 182kg, 182kg, 189kg, 192kg, 196kg</p> <p>Here 182 kg appears 2 times</p> <p>So, Mode(M<sub>o</sub>) =182 kg</p> <p></p>

Q10:

What is the range of this group of numbers:

75, 38, 75, 71, 80, 55, 75, 59?


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Arranging the data in order:</p> <p>38, 55, 59, 71, 75, 75, 75, 80</p> <p>Largest value = 80, Smallest value = 38</p> <p>Range = Largest value - Smallest value</p> <p>=80 - 38</p> <p>=42</p>

Q11:

Six children have heights 128 cm,125 cm, 130 cm, 140 cm, 139 cm, 141 cm. What is the range of their heights?

 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Arranging the data in order:</p> <p>125 cm,128 cm, 130 cm, 139 cm, 140 cm, 141 cm</p> <p>Largest value = 141 cm</p> <p>Smallest value = 125 cm</p> <p>Range =Largest value - Smallest value</p> <p>= 141 cm - 125 cm</p> <p>= 16 cm</p> <p></p> <p></p>

Q12:

Find the range from the given data:

2, 9, 7, 5, 20, 21, 20, 22, 11, 12, 8

 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution,</p> <p>Arranging the data in order:</p> <p>2, 7, 8, 9, 11, 12, 20, 20, 21, 22</p> <p>Largest value = 22</p> <p>Smallest value =2</p> <p>so, Range = Largest value - Smallest value</p> <p>= 22 - 2</p> <p>=20</p>

Q13:

Find the range from the given data:

120, 130, 135, 140, 160, 110, 111, 112

 

 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution,</p> <p>Arranging the data in order:</p> <p>110, 111, 112, 120, 130, 135, 140, 160</p> <p>Largest value = 160</p> <p>Smallest value =110</p> <p>so, Range= Largest value - Smallest value</p> <p>= 160 - 110</p> <p>= 50</p>

Q14:

Find the range from the given data:

 12 cm, 15 cm, 19 cm, 14 cm, 10 cm, 8 cm, 20 cm, 11 cm


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Arranging the data in order:</p> <p>8 cm, 10 cm, 11 cm, 12 cm, 14 cm, 15 cm, 19 cm, 20 cm</p> <p>Largest value = 20 cm</p> <p>Smallest value = 8 cm</p> <p>so, Range = Largest value - Smallest value</p> <p>= 20 cm - 8 cm</p> <p>= 12 cm</p>

Q15:

Find the range of the given data:

 4.9 ft, 5.1 ft, 6.2 ft, 5.5 ft, 4.8 ft, 6.1 ft, 4.7 ft


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Given data</p> <p>4.9 ft, 5.1 ft, 6.2 ft, 5.5 ft, 4.8 ft, 6.1 ft, 4.7 ft</p> <p>Largest value=6.2 ft</p> <p>Smallest value=4.7 ft</p> <p>so, Range=L-S</p> <p>=6.2 ft -4.7 ft</p> <p>=1.5 ft</p> <p></p>

Q16:

Find the range from given statistics:

Wages(Rs)  300  525  540  560  575  600 
No of labour 20 25 8 15 27 29

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Given</p> <table width="300"><tbody><tr><td>Wages(Rs)</td> <td>300</td> <td>525</td> <td>540</td> <td>560</td> <td>575</td> <td>600</td> </tr><tr><td>No of labour</td> <td>20</td> <td>25</td> <td>8</td> <td>15</td> <td>27</td> <td>29</td> </tr></tbody></table><p>here, Highest wage (H) = 600</p> <p>Lowest wage (L) = 300</p> <p>&there4;Range (R) = H-L</p> <p>= Rs 600 - Rs 300</p> <p>= Rs 300</p> <p></p>

Q17:

In class 7, if all the students scored marks in a between 80  40, find the range.


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Highest marks scored by the student(H)=80</p> <p>Lowest marks scored by the students(L)=40</p> <p>\(\therefore\) Range = H-L</p> <p> =80-40</p> <p> =40</p>

Q18:

The given data show the marks scored by student of class 8 while they were in class 7.Show the given data in frequency table and find mode & range.

Marks scored by student of class 8
45, 40, 42, 45, 52, 55, 60, 55, 60, 72, 85, 78, 85, 75, 70, 72, 75, 75, 82, 75, 82, 55, 60, 72, 75, 80, 85, 72, 82, 60

Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Here given marks scored by the student of class 8</p> <p>45, 40, 42, 45, 52, 55, 60, 55, 60, 72, 85, 78, 85, 75, 70, 72, 75, 75, 82, 75, 82, 55, 60, 72, 75, 80, 85, 72, 82, 60</p> <p>By showing in frequency table,</p> <table width=""><tbody><tr><td>40</td> <td>1</td> </tr><tr><td>42</td> <td>1</td> </tr><tr><td>45</td> <td>2</td> </tr><tr><td>52</td> <td>1</td> </tr><tr><td>55</td> <td>3</td> </tr><tr><td>60</td> <td>4</td> </tr><tr><td>70</td> <td>1</td> </tr><tr><td>72</td> <td>4</td> </tr><tr><td>75</td> <td>5</td> </tr><tr><td>78</td> <td>1</td> </tr><tr><td>80</td> <td>1</td> </tr><tr><td>82</td> <td>3</td> </tr><tr><td>85</td> <td>3</td> </tr></tbody></table><p>From the above frequency table 75 appears 5 times.</p> <p>Hence:Mode=75</p> <p>Highest marks scored (H) = 85</p> <p>Lowest marks obtained (L) = 40</p> <p>\(\therefore\) Range(R) = H - L</p> <p>=85 - 40</p> <p>= 45</p>

Q19:

Find the range from the given data:

120, 130, 135, 140, 150, 115, 116, 117

 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Arranging the data in order:</p> <p>115, 116, 117, 120, 130, 135, 140, 150</p> <p>Largest value (L)= 150</p> <p>Smallest value (S) = 115</p> <p>so, Range = L - S</p> <p>= 150 - 115</p> <p>= 35</p>

Q20:

Find the range from the given data: 

1, 2, 3, 4, 5, 6, 7, 8, 9, 10


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Largest value= 10</p> <p>Smallest value=1</p> <p>so, Range=Largest value - Smallest value</p> <p>=10 - 1</p> <p>=9</p>

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Annelida

Annelida

Example of phylum Annelida
source:www.kullabs.com
fig:Example of phylum Annelida

Annelida is composed of two words i.e. annulus which means ring and eidos which means form. Lamarck coined the term Annelida.

General characteristic features of phylum Annelida:

  • They are elongated and metamerically segmented.
  • They are mostly aquatic and some are terrestrial and burrowing. Few are ectoparasites sucking the blood from vertebrates.
  • They are triploblastic.
  • They are bilaterally symmetrical.
  • It is true coelom type formed by mesoderm. Such coelom is called schizocoelous.
  • It takes place by setae or parapodia or suckers.
  • Nutrition is a holozoic type.
  • The alimentary canal is straight and well developed. Digestion is entirely extracellular.
  • Respiration takes place through a moist body surface by diffusion.
  • Blood vascular system is closed type consisting of hearts and blood vessels.
  • Excretion takes place through segmentally arranged nephridia.
  • The body contains metameric segmentation.
  • Presence of distinct head. The nervous system consists of a pair of cerebral ganglia and double solid ventral nerve cord.
  • Reproduction is usually hermaphrodite. Some cases, there is unisexual. Fertilization is cross and internal.
  • Development may be direct or indirect with the larval stage as trochophore.

Classification:

Annelida is classified into four classes on the basis of locomotory organs.

Amphitrite
source:www.luckyshow.org
fig:Amphitrite

Polychaeta:

  • Locomotory organs are parapodia.
  • Mainly marine, some freshwater.
  • Clitellum is absent.
  • Sexes are separate.
  • Fertilization is external. Development is indirect.
  • Example: Nereis, Amphitrite

Oligochaeta:

  • Locomotory organs are setae found in each segment.
  • Mostly terrestrial, some fresh water.
  • Clitellum is present.
  • They are hermaphrodite.
  • Fertilization is external, occurs in a cocoon.
  • Development is direct.
  • Example: Pheretima, Negascolen.

Hirudo
source:www.uniprot.org
fig:Hirudo

Hirudinea:

  • Locomotory organs are suckers.
  • Mostly freshwater and terrestrial, some marine.
  • They are mostly ecoparasites having suckers.
  • Clitellum is only seen during a breeding season.
  • Fertilization is external, occurs in a cocoon.
  • Example: Hirudinaria, Hirudo.

Arachiannelid:

  • Segmentation is internal only.
  • Exclusively marine.
  • Parapodia and setae are present.
  • Tentacles are present.
  • Sexes are separate. Development is indirect.
  • Example: Polygordius, Protgdrillus.

Lesson

Introduction to kingdom Animalia

Subject

Biology

Grade

Grade 11

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