General Biology: Definitions and explanations page 16 PDF Book

Learn general biology terms with definitions and explanations, biology terminologies (Page 16) for biology degree programs.


  1. What are Sporophylls?
    A sporophyll is a leaf that bears sporangia. both microphylls and megaphylls can be sporophylls. sporophylls ...
  2. What is Stabilizing selection?
    An example of stabilizing selection is the birth weight of human babies which is usually in ...
  3. What are Stamens?
    The stamen is the pollen-producing reproductive organ of a flower. collectively the stamens form the androecium. ...
  4. What is Starch?
    Starch is a complex carbon found in several plants and is made of multiple glucose monomers ...
  5. What are Statoliths?
    Statocytes are cells thought to be involved in gravitropic perception in plants, located in the cap ...
  6. What is Stele?
    In a vascular plant, the stele is the central part of the root or stem containing ...
  7. What is Stem cell?
    A stem cell is a cell with the unique ability to develop into specialized cell types ...
  8. What are Stem cells?
    Stem cells are cells that can differentiate into other types of cells, and can also divide ...
  9. What is Stem?
    A stem is one of two main structural axes of a vascular plant, the other being ...
  10. What are Steroids?
    Steroids are an active biological compound that has four rings that are organized in a special ...
  11. What is Sticky end?
    Overhangs are called cohesive ends or sticky ends. they are most often created by restriction endonucleases ...
  12. What is Stigma?
    The ovary often supports a long style, topped by a stigma. the mature ovary is a ...
  13. What is Stock?
    Grafting and budding are horticultural techniques used to join parts from two or more plants so ...
  14. What is Stomach?
    The stomach is a muscular, hollow organ in the gastrointestinal tract of humans and many other ...
  15. What is Stomata?
    Stomata are tiny openings or pores in plant tissue that allow for gas exchange. stomata are ...
  16. What is Strata?
    A stratum is defined as a layer of sedimentary rock or soil, or igneous rock that ...
  17. What is Stratified squamous epithelium?
    A stratified squamous epithelium consists of squamous (flattened) epithelial cells arranged in layers upon a basal ...
  18. What are Strigolactones?
    Promote seed germination, control of apical dominance, and the attraction of mycorrhizal fungi to the root. ...
  19. What is Stroke volume?
    In cardiovascular physiology, stroke volume (sv) is the volume of blood pumped from the left ventricle ...
  20. What is Stroke?
    A stroke is a medical condition in which poor blood flow to the brain results in ...
  21. What is Stroma?
    The stroma refers to the colorless fluid surrounding the grana within the chloroplast. within the stroma ...
  22. What are Stromatolites?
    Stromatolites or stromatoliths are layered mounds, columns, and sheet-like sedimentary rocks that were originally formed by ...
  23. What is Style?
    The style and stigma of the flower are involved in most types of self incompatibility reactions. ...
  24. What is Substrate feeder?
    Substrate feeders dwell in or on their food source. leaf miners are tiny substrate-feeding insects that ...
  25. What is Sugar sink?
    Sinks are areas in need of nutrients, such as growing tissues. when they are low in ...
  26. What is Sugar source?
    Sugars, which are formed by the plant during photosynthesis, are an essential component of plant nutrition. ...
  27. What is Surface tension?
    Surface tension is the tendency of fluid surfaces to shrink into the minimum surface area possible. ...
  28. What is Sustainable agriculture?
    Sustainable agriculture is farming in sustainable ways which ensures meeting society's food and textile needs in ...
  29. What is Symbiont?
    An organism living in symbiosis with another which is usually smaller and lives on the body ...
  30. What is Symbiosis?
    Symbiosis is any type of a close and long-term biological interaction between two different biological organisms, ...
  31. What is Symplast?
    The symplast of a plant is the inner side of the plasma membrane in which water ...
  32. What are Symplastic domains?
    Symplastic domains in plants are defined by spatial limitations on cell-to-cell communication through plasmodesmata (pds) and ...
  33. What is Symplastic route?
    The symplast of a plant is the inner side of the plasma membrane in which water ...
  34. What is Synapsis?
    Synapsis is the pairing of two homologous chromosomes that occurs during meiosis. during synapsis, a possible ...
  35. What is Synaptonemal complex?
    The synaptonemal complex is a protein structure that forms between homologous chromosomes during meiosis. this complex ...
  36. What is Systemic acquired resistance?
    Systemic acquired resistance is a resistance response that occurs following an earlier localized exposure to a ...
  37. What is Systems biology?
    Systems biology is basically an interdisciplinary field that incorporates the use of multiple approaches in order ...
  38. What is Systole?
    The systole is the part of the cardiac cycle during which some chambers of the heart ...
  39. What is Systolic pressure?
    Blood pressure is usually expressed in terms of the systolic pressure (maximum during one heartbeat) over ...
  40. What is TATA box?
    A tata box is a dna sequence that indicates where a genetic sequence can be read ...
  41. What is Taxonomy?
    Taxonomy is the science of defining and naming groups of biological organisms on the basis of ...
  42. What is Technology?
    Technology is the collection of skills and techniques, methods and processes that help in production of ...
  43. What are Telomers?
    Telomeres are the caps at the end of each strand of dna that protect our chromosomes, ...
  44. What is Temperate phage?
    Temperate phages are those that incorporate their viral genome in the host genome and coexist with ...
  45. What is Temperature?
    Temperature is the measure of hot or cold with reference to a standard value. basically temperature ...
  46. What is Template strand?
    Template strand is the strand that actually acts as a template for the production of a ...
  47. What is Terminator?
    Terminator is a section of nucleic acid sequence that marks the end of a gene or ...
  48. What is Testcross?
    In genetics, a test cross was first introduced by gregor mendel. this type of test involves ...
  49. What is Testes?
    Testicles are the male reproductive gland or gonad in all animals, including humans. they are the ...
  50. What is Theory?
    A theory is a plausible or scientifically acceptable general principle or body of principles offered to ...
  51. What is Thermal energy?
    Thermal energy comes from heat and comes from the movement of tiny particles with in a ...
  52. What are Thermodynamics?
    Thermodynamics deals with the relationships between heat and other forms of energy. in particular, it describes ...
  53. What is Thermogenesis?
    Thermogenesis is the process of heat production in organisms. it occurs in all warm-blooded animals, and ...
  54. What is Thermoregulation?
    Thermoregulation is the ability of an organism to keep its body temperature within certain boundaries, even ...
  55. What is Thigmomorphogenesis?
    Thigmomorphogenesis is the response by plants to mechanical sensation by altering their growth patterns. in the ...
  56. What is Thigmotropism?
    Thigmotropism is a directional growth movement which occurs as a mechanosensory response to a touch stimulus. ...
  57. What is Thrombin?
    Thrombin is a serine protease. it is an enzyme that, in humans, is encoded by the ...
  58. What are Thylakoids?
    A thylakoid is a membrane-bound compartment inside chloroplasts and also many photosynthetic bacteria such as cyanobacteria. ...
  59. What are Thymine dimers?
    Pyrimidine dimers are molecular lesions formed from thymine or cytosine bases in dna via photochemical reactions. ...
  60. What is Thymus?
    The thymus is a specialized primary lymphoid organ of the immune system. within the thymus, t ...