Few terms used in Biology Topics
Important Data Related to Biology Topics
Human RBC - 7 – 8 µm.
Unicellular eukaryote - 5 – 100 µm in size.
Human RBC and lymphocytes - 7-8 µm (smallest).
Human nerve cell - 90 cm long (largest).
Largest acellular plant Acetabularia - 10 cm long and animal Amoeba-1 mm.
Largest prokaryote Spirulina - 13 – 15 µm.
Fibres of ramie - 55 cm long and hemp fibres - 100 cm long.
Smallest prokaryotic cell Mycoplasma hominis (PPLO) - 0.1 – 0.3 µm in size.
The cell of a multicellular eukaryote - is 1 – 1000 µm in size.
Ostrich egg (Largest cell) is 15-20 × 13.5-15 cm in size. An Ostrich egg is not considered a true cell as it stores a large amount of reserve food. Viruses do not have a cellular structure.
Biology Dictionary
Artificial Classification: Classification based on one or at the most few characters.
Ascus: A cell in which nuclei fuse and go through meiosis after which the protoplast divides and forms meiospores.
Archegonium: Female gametangium or egg-bearing organ in which the egg is protected by a jacket of sterile cells.
Basidiospores: Type of meiospore borne by basidia in the basidiomycetes.
Carotenes: A reddish-orange plastid pigment.
Carotenoids: A class of fat-soluble compounds that includes carotenes, Xanthophyll.
Heterogamy: Reproduction involving two types of gametes.
Heterospory: The condition of producing two kinds of spores [mega and micro]
Heterothallic: Incapable of self-fertilization.
Meiosis: A type of nuclear division in which four cells are produced each with half the chromosome number of the original cell.
Population: A group of inbreeding organisms.
Triploblastic: Mesoderm is also present along with ectoderm and endoderm in the embryo.
Haemocyanin: Blue-coloured respiratory pigment.
Sexual Dimorphism: Sexes separate.
Hibernation: Winter Sleep
Aestivation: Summer sleep
Artificial Classification: Classification based on one or at the most few characters.
Ascus: A cell in which nuclei fuse and go through meiosis after which the protoplast divides and forms meiospores.
Archegonium: Female gametangium or egg-bearing organ in which the egg is protected by a jacket of sterile cells.
Basidiospores: Type of meiospore borne by basidia in the basidiomycetes.
Carotenes: A reddish-orange plastid pigment.
Carotenoids: A class of fat-soluble compounds that includes carotenes, Xanthophyll.
Heterogamy: Reproduction involving two types of gametes.
Heterospory: The condition of producing two kinds of spores [mega and micro]
Heterothallic: Incapable of self-fertilization.
Meiosis: A type of nuclear division in which four cells are produced each with half the chromosome number of the original cell.
Population: A group of inbreeding organisms.
Triploblastic: Mesoderm is also present along with ectoderm and endoderm in the embryo.
Haemocyanin: Blue-coloured respiratory pigment.
Sexual Dimorphism: Sexes separate.
Hibernation: Winter Sleep
Aestivation: Summer sleep