MCQ
Endocrine glands are
- ✓Ductless glands whose secretions pour directly into blood
- BHave ducts and pour their secretions into blood directly
- CHave ducts which straightway pour secretions into target organs
- DAll of the above
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| List-I | List-II |
| (a) Adhering junctions | (i) Establish a barrier that prevents leakage of extracellular fluid across a layer of cells |
| (b) Tight junctions | (ii) Functions like rivets and fasten cells together into strong sheets |
| (c) Gap junctions | (iii) Pass information through neurotransmitters from one cell to another |
| (d) Synaptic junctions | (iv) Provide cytoplasmic channels from one cell to an adjacent cell for communication |

| List $I$ | List $II$ |
| $A.$ Pleurobrachia | $I.$ Mollusca |
| $B.$ Radula | $II.$ Ctenophora |
| $C.$ Stomochord | $III.$ Osteichthyes |
| $D.$ Air bladder | $IV.$ Hemichordata |
Choose the correct answer from the options given below :