MCQ
Universe originated about .............. years ago.
- A15 million
- B20 billion
- C4.5 billion
- D3.4 billion
Explanation:
The universe is very old and originated about 20 billion years ago according to Big Bang theory. The universe is the cluster of galaxies which contain stars and clouds of gas and dust.
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| List $-I$ | List $-II$ |
| $a$ In lac operon $i$ gene codes for | $i$ transacetylase |
| $b$ In lac operon $z$ gene codes for | $ii$ permease |
| $c$ In lac operon $y$ gene codes for | $iii$ $\beta$ - galactosidase |
| $d$ In lac operon $a$ gene codes for | $iv$ Repressor |
Choose the correct answer from the options given below :
$I -$ 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.