25. The chronological sequence of the periods of Mesozoic era is ?
- Triassic, cretaceous & Jurassic
- Cretaceous, Jurassic & Triassic
- Jurassic, Triassic & cretaceous
- Triassic, Jurassic & cretaceous
Answer:
Triassic, Jurassic & cretaceous
26. A theory is formed when?
- a hypothesis is proved by experiments
- Many deduction can be made from the same hypothesis
- Many new hypotheses produce same result
- None of these
Answer:
Many new hypotheses produce same result
27. A Productive theory is that?
- Which can produce many new theories?
- Which can suggest new hypotheses?
- Which gives rise to biological law?
- None of these
Answer:
Which gives rise to biological law?
28. Tissue culture is a technique is which ?
- Plants are grown from roots
- Plants are grown form cuttings of stem
- Plants are grown form cells or group of cells
- Plants are grown form seed
Answer:
Plants are grown form cells or group of cells
29. Who is the parent of a clone?
- Whose nucleus is taken
- Whose egg is taken?
- In which egg is planted
- a & b
Answer:
Whose nucleus is taken
30. One of the following processes takes place during hydroponics culture technique?
- plants are grown in green house
- plants are grown in simple water
- plants are grown in arid land
- plants are grown in aerated water
Answer:
plants are grown in aerated water
