MCQ
Physical exercise improves the _________ system.
- AReproductive
- BExcretory
- CNervous
- DCardiovascular
Explanation:
Physical exercise enhances or maintains physical fitness. It strengthens muscles and improves the cardiovascular system.
Regular physical activity can also lower the blood pressure and improve the cholesterol levels. No physical activity results in increased risk of cardiovascular disease.
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Reason : The $Bt$ gene is derived from a bacterium.
Dead animal $\rightarrow$ Blow flymaggots $\rightarrow$ Common frog $\rightarrow$ Snake
$I.$ Tightly linked genes on the same chromosome show higher recombinations.
$II.$ Genes far apart on the same chromosome show very few recombinations.
$III.$ Genes loosely linked on the same chromosome show similar recombinations.
| Column - $I$ | Column - $II$ |
| $(a)$ Parasitism | $(i)$ $++$ |
| $(b)$ Commensalism | $(ii)$ $+-$ |
| $(c)$ Amensalism | $(iii)$ $0+$ |
| $(d)$ Mutualism | $(iv)$ $0-$ |
| List $I$ | List $II$ |
| $A$ $RNA$ polymerase $III$ | $I$ snRNPs |
| $B$ hline Termination of transcription | $II$ Promotor |
| $C$ Splicing of Exons | $III$ Rho factor |
| $D$ $TATA$ box | $IV$ SnRNAs, tRNA |