Biology (Objective) (Pages :32)

  • 31 Name two nitrogen fixing bacteria?

    Ans : Rhizobium & Azetobactor
  • 32 The plants absorbs the element nitrogen in the form of?

    Ans : Nitrates
  • 33 Name the plant that absorbs ammonia directly?

    Ans : Paddy
  • 34 Write an example of nitrogen fixing algae?

    Ans : Cyanobacteria
  • 35 Name the minerals caused by Eutrophication?

    Ans : Nitrogen; phophorus
  • 36 Black gram is very rich in ......?

    Ans : Proteins & carbohydrates
  • 37 Name two insecticides?

    Ans : DDT; BHC
  • 38 Dioxin is a common .........?

    Ans : Weedicide
  • 39 Which scientist coined the term ‘Biology’?

    Ans : Jean Lamarck
  • 40 Which is the monocarpic plant which shows gregarious flowering once in 48 years?

    Ans : Bamboo
  • 41 BHC is the common name of....?

    Ans : Gamaxin
  • 42 Which gas lead to global warming?

    Ans : Carbondioxide
  • 43 Which gas lead to ozone depletion?

    Ans : Chlorofluro carbon
  • 44 What is the term used for the occurrence of more than one type of morphologically different leaves on the same plant?

    Ans : Heterophylly
  • 45 What is cladode?

    Ans : The modification of stem to carry the function of leaf is called cladode. eg: Opuntia
  • 46 What is the male reproductive part of the flower known as?

    Ans : Stamens
  • 47 What is the most common nutritive tissue for the developing embryos in angiosperm known as?

    Ans : Endosperm
  • 48 What is the common name of Agaricus?

    Ans : Mushroom
  • 49 What is cambium?

    Ans : Elongated cells in between xylem and phloem in dicot plants constitute cambium
  • 50 Write the name of the trees which flower only once in a complete life-cycle?

    Ans : Monocarpic
  • 51 Give the name of an organism that derives its nourishment from another living organism?

    Ans : Parasite
  • 52 How do plant cells differ from animal cells?

    Ans : In having cell walls; plastids and large vacuoles
  • 53 Name an organism having characters of both plants and animals?

    Ans : Euglena
  • 54 In which plants the annual rings are absent?

    Ans : Gymnosperms
  • 55 What is the peculiarity of Gymnosperms?

    Ans : They have naked ovules
  • 56 Fruits are not produced in gymnosperms. Why?

    Ans : Because they are without an ovary
  • 57 In gymnosperms; How does pollination takes place?

    Ans : Through Wind
  • 58 Name any polygamous type of plant?

    Ans : Mango
  • 59 What do you mean by IUCN?

    Ans : International Union for Conservation of Nature and Natural Resources
  • 60 Name a plant that forms fruits but no seed?

    Ans : Banana

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