MCQ
_______ are responsible for chemical coordination.
- ANeurons
- BNephrons
- ✓Hormones
- DEnzymes

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| List - l | List - ll |
| (a) Cellular barrier | (i) Interferons |
| (b) Cytokine barrier | (ii) Mucus |
| (c) Physical barrier | (iii) Neutrophils |
| (d) Physiological barrier | (iv) HCI in gastric juice |

$I.$ It is phenomenon in which more recombinants are produced in $F_{2}$-generation
$II.$ More parental combination are produced in $F_{2}$-generation
$III.$ Genotype which are present in $F_{1}$ hybrid. Reappear in high frequency in $F_{2}$-generation
$IV.$ It is a phenomenon in which two chromosome are linked
Choose the correct option for $A, B, C$ and $D$