Which of the following is absent in a prokaryotic cell? MCQ with Answer and Explanation

Explanation:
Colostrum, the first milk produced by the mother, is rich in IgA antibodies, providing natural passive immunity to the newborn. Allergies (hypersensitivities) occur when the immune system overreacts to harmless environmental antigens (allergens). Autoimmune diseases arise when the immune system loses tolerance and mistakenly attacks the body's own healthy cells and tissues. All statements are correct.

Explanation:
Phycology (algology) is the study of algae, which are photosynthetic eukaryotic organisms ranging from unicellular to multicellular forms. Mycology deals with fungi, bryology with mosses and liverworts, and pteridology with ferns. Algae include green algae, red algae, brown algae, and diatoms, and are important primary producers in aquatic ecosystems.

Explanation:
Bryophytes are non-vascular land plants that include mosses, liverworts, and hornworts. Funaria is a common moss and a classic example of a bryophyte. Spirogyra is a green alga, ferns are pteridophytes (vascular cryptogams), and Pinus is a gymnosperm.