Plant Pathology - Study Mode
[#176] Which is part of female reproductive system?
Correct Answer
(A) Embryo sac
Explanation
Solution: Embryo sac is part of the female reproductive system. The female gametophyte develops within the ovule and generally consists of three antipodal cells, one central cell, two synergid cells and one egg cell. The female gametophyte is also commonly called the embryo sac or megagametophyte.
[#177] Non-essential but useful nutrients for plants would include
Correct Answer
(D) vanadium and sodium
Explanation
Solution: Non-essential but useful nutrients for plants would include vanadium and sodium. Vanadium and Sodium are non-essential but useful nutrients for plants. Plants require 17 essential nutrients for their growth and development, but vanadium and sodium are not on that list. Vanadium is a multivalent redox-sensitive metal, low levels of vanadium elevate plant height, root length, and biomass production due to enhanced chlorophyll biosynthesis, seed germination and also for essential element uptake. Sodium is needed by a few varieties of plants to help concentrate carbon dioxide, but in trace amounts to promote metabolism.
[#178] Who discovered Bacteriophage?
Correct Answer
(C) De Herelle
Explanation
Solution: De Herelle discovered Bacteriophage. A bacteriophage, also known informally as a phage, is a duplodnaviria virus that infects and replicates within bacteria and archaea. De Herelle called the virus a bacteriophage, a bacteria-eater. He also recorded a dramatic account of a man suffering from dysentery who was restored to good health by the bacteriophages. It was de Herelle who conducted much research into bacteriophages and introduced the concept of phage therapy.
[#179] Double fertilization is fusion of
Correct Answer
(D) One male gamete with egg and other with secondary nucleus
Explanation
Solution: Double fertilization is a fusion of one male gamete with an egg and the other with secondary nucleus. Double fertilization is a complex fertilization mechanism of flowering plants (angiosperms). This process involves the joining of a female gametophyte (megagametophyte, also called the embryo sac) with two male gametes (sperm). The process of double fertilization is a unique biological process in which one sperm fuses with the egg to produce the embryo while the second fuses with the central cell to form the endosperm, a nutritive tissue needed for the growth of the succeeding generation.
[#180] Potato wart is an example of which type of disease?
Correct Answer
(B) Endemic
Explanation
Solution: Potato wart is an example of an Endemic type of disease. Synchytrium endobioticum is a chytrid fungus that causes potato wart disease or black scab. It also infects some other plants of the genus Solanum, though potato is the only cultivated host. Potato wart is a soil-borne fungus that can remain dormant in a field for more than 40 years. Cool and wet soils are conducive to potato wart disease development. The infected plant cells swell, divide and surround the dividing zoospores resulting in the wart.