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Structures present only in 7^(th) and 9...

Structures present only in `7^(th) and 9^(th)` segments of pheretima posthuma are

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Lateral hearts
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In an experiment with potentiometer, V_(B) =10V ,R us adjusted to be 50Omega . A student wanting to measure voltage E_(1) of a battery (approx.8V) finds no null point possible. He then diminshes R to 10Omega and is able to locate the null point on the last (4^(th)) segment of the potentiometer. The resistance of the potentiometer wire (R) will be a lt R lt b. Find the value of ((b)/(a)) .

Setae help in locomotion in earthworm but are not uniformly present in all the segments. They are present in (A) 1^(st) segment (B) Last segment (C) Clitellar segment (D) 20^(th) - 22^(nd) segment

A body moving with uniform acceleration, covers a distance of 20 m in the 7^(th) second and 24 m in the 9^(th) second. How much shall it cover in 15^(th) second?

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A chord of a circle of radius 20 cm subtends an angle of 90^(@) at the centre. Find the area of th corresponding major segment of the circle. (Use pi = 3.14 )

In a specially designed vernier calipers, 10 divisions of the vernier scale are equal to 4 divisions of the main scale. In the following figure, the zero error and a measurement are shown. In the zero error, the 5^(th) and the 10^(th) divisions of the vernier coincides with 1 mm and 3 mm mark on the main scale respectively and in the measurement, the 2^(nd) and the 7^(th) divisions of the vernier scale coincide with the 23 mm and 25 mm mark on the main scale respectively as shown in the figure. Report the length measured with due regards to the error.

Two clocks A and B being tested against a standard clock located in the national laboratory At 10.00 AM by the standard clock, the readings of the two clocks are shown in following table {:("Day","Clock A","Clock B"),(I^("st"),10:00:06,8:15:00),(II^("nd"),10:01:13,8:15:0.1),(III^("rd"),9:59:0.8,8:15:04),(IV^("th"),10:02:15,8:14:58),(V^("th"),9:58:10,8:15:02):} If you are doing an experiment that requires precision time interval measurements, which of the two clocks will you prefer ?

In a vernier callipers the main scale and the vernier scale are made up different materials. When the room temperature increases by DeltaT^(@)C , it is found the reading of the instrument remains the same. Earlier it was observed that the front edge of the wooden rod placed for measurement crossed the N^(th) main scale division and N + 2 MSD coincided with the 2nd VSD. Initially, 10 VSD coincided with 9MSD. If coefficient of linear expansion of the main scale is alpha_(1) and that of the vernier scale is alpha_(2) then what is the value of alpha_(1)//alpha_(2) ? (Ignore the expansion of the rod on heating)

ALLEN -EARTHWORM-EXERCISE-2
  1. The process of increasing fertility of soil by the earthworms is calle...

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  2. Septal nephridia of earthworm open in-

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  3. Structures present only in 7^(th) and 9^(th) segments of pheretima po...

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  4. What is the functions of dorsal blood vessel in pheretima-

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  5. The function of blood glands in pheretima.

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  6. In pheretima posthuma female genital pore is present in which segment-

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  7. In pheretima posthuma pharyngeal nephridia are present in

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  8. Typholosole of pheretima can be found in-

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  9. The typhlosole of earthworm is related with-

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  10. Blood vessel in earthworm which has valve is-

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  11. Clitellum of pheretima is primarily concerned with-

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  12. Segment having male genital pore in earthworm-

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  13. In pheretima the testis are located in which segments.

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  14. In pheretima accessory glands are present in which segments-

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  15. In earthworm, which type of structure regulate the volume and composit...

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  16. In the garden, earthworm can be traced by their faecal deposits known ...

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  17. In earthworm the dorsal surface of the body is marked by a dark median...

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  18. Arrange the external opening and their segmental number of pheretima-

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  19. The enteronephric nephridia of earthworm are mainly concerned with

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  20. In earthworm and cockroach which type of structure is common-

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