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In which subphylum notochord extends fro...

In which subphylum notochord extends from head to tail and persistent throughout the life?

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The correct Answer is:
Chondrichthyes
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Give the magnitude and direction of the net force acting on a stone of mass 0.1 kg, (a) just after it is dropped from the window of a stationary train, (b) just after it is dropped from the window of a train running at a constant velocity of 36 km/h, (c ) just after it is dropped from the window of a train accelerating with 1 m s^(-2) , (d) lying on the floor of a train which is accelerating with 1 m s^(-2) , the stone being at rest relative to the train. Neglect air resistance throughout.

A circus wishes to develop a new clown act. Fig. (1) shows a diagram of the proposed setup. A clown will be shot out of a cannot with velocity v_(0) at a trajectory that makes an angle theta=45^(@) with the ground. At this angile, the clown will travell a maximum horizontal distance. The cannot will accelerate the clown by applying a constant force of 10, 000N over a very short time of 0.24s . The height above the ground at which the clown begins his trajectory is 10m . A large hoop is to be suspended from the celling by a massless cable at just the right place so that the clown will be able to dive through it when he reaches a maximum height above the ground. After passing through the hoop he will then continue on his trajectory until arriving at the safety net. Fig (2) shows a graph of the vertical component of the clown's velocity as a function of time between the cannon and the hoop. Since the velocity depends on the mass of the particular clown performing the act, the graph shows data for serveral different masses. If a clown holds on to hoop instead of passing through it, what is the position of the cable so that he doesn't hit his head on the ceiling as he swings upward?

Three coins are tossed once. Let A denote the event 'three heads show", B denote the event "two heads and one tail show", C denote the event" three tails show and D denote the event 'a head shows on the first coin". Which events are (i) mutually exclusive? (ii) simple (iii) Compound?

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ALLEN -ANIMAL KINGDOM-Exercise
  1. In which class of fishes mouth is located ventrally?

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  2. Which types of scales are found on the body of cartilagenous fishes?

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  3. In which subphylum notochord extends from head to tail and persistent ...

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  4. The teeth in cartilaginous fishes are formed due to modification of wh...

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  5. What is the name of structure that prevents the bony fishes from sinki...

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  6. Why do chondrichthyes swim constantly?

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  7. Name a fish which has electric organ.

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  8. Name a fish which possess poisonous sting.

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  9. The animals which don't have the capacity of regulate their body tempe...

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  10. How many pairs of gills are present in bony fishes?

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  11. Name the cap which covers the gills in fishes:

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  12. Which structure represents ear in amphibians and reptiles?

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  13. In which class of vertebrates 3-chambered heart is found?

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  14. The common chamber for alimentary canal, urinary, bladder and reproduc...

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  15. Which class of vertebrates possesses dry and cornified skin with epide...

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  16. In which reptiles 4-chambered heart is present?

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  17. Snakes and lizards shed off their scales often. This phenomenon is cal...

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  18. The presence of feathers is characteristic of which class?

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  19. The bones of birds are long and hollow with air cavities. These types ...

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  20. name of the additional chambers found in the digestive tract of birds:

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