Ans. A gland is a cell or group of cells which secrete a substance or chemical. Many glands in our body are exocrine. Such glands have ducts for releasing their secretions e.g. digestive glands, skin glands etc. While on the other hand endocrine glands are ductless glands and release their secretions (hormones) directly into bloodstream e.g. pituitary gland, thyroid gland etc.