MCQ
Harderian glands are absent in:
- ARabbits.
- BMen.
- CCrows.
- DNone of the above.
Explanation:
The Harderian gland is a gland found in the eye's orbit that occurs in tetrapods (reptiles, amphibians, birds, and mammals) that possess a nictitating membrane. The proposed functions of the gland are remarkably diverse and include the gland being - a source of saliva; a site of immune response; a photoprotective organ; part of a retinal-pineal axis; a source of pheromones; a source of thermoregulatory lipids; a site of osmoregulation, and a source of growth factors. The Harderian gland is either absent or vestigial in primates.
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| Column I | | Column II | |
| A | Hemaphrodite | i. | Produces blood cells and haemoglobin |
| B | Direct development | ii. | Tectis and ovary in the same animal |
| C | Chemoreceptor | iii. | Larval from absent |
| D | Blood gland in earthworm | iv. | Sense of chemical substances |