MCQ
The life originated on earth through a process of:
- AChemosynthesis
- BSpontaneous origin
- CSpecial creation
- DNone of the above
Explanation:
Scientists have developed a theory that describes how the very first microscopic life on primitive Earth could have evolved as a result of a series of chemical reactions. This theory is called chemosynthesis, and it describes the chemical evolution of cellular life.
Chemosynthesis, process in which carbohydrates are manufactured from carbon dioxide and water using chemical nutrients as the energy source, rather than the sunlight. It starts when random molecules in the atmosphere of primitive earth form simple organic molecules with energy provided by ultra violet light, radiation and other energy sources.
The chemosynthesis theory implies that the development of life is probable wherever the proper physical and chemical conditions are in place.
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$I.$ Extraction of the desired gene product
$II.$ Amplification of the gene of interest
$III.$ Isolation of a desired $DNA$ fragment
$IV.$ Ligation of the $DNA$ fragment into a vector
$V.$ Insertion of recombinant $DNA$ into the host
Correct order is
$I -$ Tapetum nourishes the developing pollen grains.
$II-$ Hilum represents the junction between ovule and funicle
$III-$ In aquatic plants such as water hyacinth and water lily, pollination is by water:
$IV-$ The primary endosperm nucleus is tripoid.