Question
Non-Chordates and Chordates
✓
Answer
| Non-chordates | Chordates | ||
| (i) | Notochord is absent. | (i) | Notochord is present at some stages. |
| (ii) | The heart if present is dorsal in position. | (ii) | The heart is ventral in position. |
| (iii) | They do not posses pharyngeal gill- slits. | (iii) | They posses pharyngeal gill- slits. |
| (iv) | Nerve cord if present is double, ventral and solid. | (iv) | Nerve cord is single, dorsal and hollow. |
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Question
(i) What are the masses of the objects shown?
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Question
(i) What are the masses of the objects shown?
(ii) What is the distance between their centres?
(iii) Write gravitational force between them.
(iv) Why gravitation constant is called universal constant?
(v) What will happen to gravitational force if mass of one of the objects is doubled?
(vi) What is the value of universal constant in SI?
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