1236: Which one of the following statements is not correct ?
(a) All echinoderms are viviparous
(b) Round worm has no circulatory system
(c) In bony fishes, swim bladder is usually present
(d) In cartilaginous fishes, fertilisation is internal
1237: Consider the following statements:
1. The Earth's magnetic field has reversed every few hundred thousand years.
2. When the Earth was created more than 4000 million years ago, there was 54% oxygen and no carbon dioxide.
3. When living organisms originated, they modified the early atmosphere of the Earth.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
1238: In which one of the following union territories, do the people of the Onge tribe live?
(a) Andaman and Nicobar Islands
(b) Dadra and Nagar Haveli
(c) Daman and Diu
(d) Lakshadweep
1239: In which one of the following countries are 75 percent of seats in both Houses of Parliament filled oh the basis of first-past-the-post system and 25 per cent on the basis of Proportional Representation system of elections ?
(a) Germany
(b) Italy
(c) France
(d) Russia
1240: Which bacterial strain, developed from natural isolates by genetic manipulations, can be used for treating oil spills ?
(a) Agrobacterium
(b) Pseudomonas
(c) Nitrosomonas
(d) Clostridium