MCQ
Inner layer of pericarp is hard and stony in:
- ADateplam, Almond.
- BWood, apple, Pea.
- ✓Mango, Coconut.
- DPear, Litchi.
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$R$ : Gap junctions facilitate the cells to communicate with each other.
| Option | Characteristics | Class |
| $(a)$ | Sucking and circular mouth; jaws absent, integument without scales; paired appendages. | Cyclostomata |
| $(b)$ | Body covered with feathers; skin moist and glandular, fore-lims form wings; lungs with air sacs. | Aves |
| $(c)$ | Mammary gland; hair on body; pinnae; two pairs of limbs. | Mammalia |
| $(d)$ | Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord. | Chondrichthyes |