General Knowledge (GK) Question and Answers – Botany

  • The term mutation was first used by Hugo de Vries (1901) who observed it in Oenothera lamarckiana.
  • In 1953, S. James Watson and F.H.Crickproposed a model of double helix structure of DNA molecule for which they were awarded noble prize.
  • The term gene was coined by W. Johannsen in 1909.
  • In 1933, Morgan discovered hereditary functions of chromosomes.
  • The term “CELL” was coined by Robert Hooke (1665).
  • Schleidenand Theodor Schwann propounded the cell theory in 1839.
  • Auxins were discovered by Went in 1928.
  • The growth in length of plants can be measured by an instrument called Lever or Arc Auxanometer.
  • The cytokinins are plant hormones which act primarily on cell division. It was first isolated by Miller and his coworkers in USA.
  • The discovery of gibberellins was made by a Japanese plant pathologist Kurusowa.
  • Pasteur (1860) discovered that yeast could respire in the absence of molecular oxygen.
  • Dark reaction was discovered by Melvin Calvin.
  • Mohl’s Half Leaf Experiment proves that carbon di oxide is essential for photosynthesis.

 

Symptoms of Mineral deficiency in plants:

Deficiency symptoms are external manifestations of the deficiency of mineral elements in plants. The deficiency can be related to absence of a particular nutrient in the soil or non availability of the nutrient to the plant due to various reasons. Some of the common deficiency symptoms observed in plants are:

  • Chlorosis – Loss of chlorophyll leading to yellowing of leaves.
  • Mottling – Appearance of patches of green and non-green areas on the leaves.
  • Wilting – Drooping of the leaves due to loss of conduction of water.
  • Necrosis – Death of tissues in certain parts.
  • Stunted growth – Plants with shortened internodes and smaller in size.

 

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4 responses to this post.

  1. Posted by ayaz on November 16, 2012 at 7:29 pm

    sir thank u for this basic knowledge of botany, and sir i request u to add basic
    families name in botany

    Reply

  2. Posted by Thank u sir it is wonder full notes on August 16, 2011 at 3:52 pm

    Hai

    Reply

  3. Posted by Babuji,M.Sc.,B.Ed, on August 10, 2011 at 9:14 am

    All these questions will be very usefull for the students those who are preparing for compatetive exam.Thank you sir.Plz add more question. This is my request sir.

    Reply

  4. keep it up sir .

    Reply

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