MCQ
Which fibres, contractile in nature are found in muscles
- AWhite fibres
- ✓Myofibrils
- CMicrofibrils
- DElastic fibres
Myofibrils alternate light and dark shades $(transverse\ striations)$ and thick longitudinal strands.
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$I$. It checks the mixing of oxygenated and deoxygenated blood in heart
$II$. It circulates only oxygenated blood through heart.
Choose the correct option accordingly


| List $I$ | List $II$ |
|
$A$. Two or more alternative forms of a gene |
$I$. Backcross |
| $B$. Cross of $F_1$ progeny with homozygous recessive parents | $II$. ploidy |
| $C$. Cross of $F_1$ progeny with any of the parents | $III$. Allele |
| $D$. Number of chromosome sets in plant | $IV$. Test cross |
Choose the correct answer from the options given below: