Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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71.

A fern differs from a moss in having

  • Swimming archegonia

  • Swimming antherozoids

  • Independent gametophytes

  • Independent sporophytes


D.

Independent sporophytes

Fern (pteridophyte) differs from a moss s(bryophyte) in having independent gametophyte, while in moss the sporophyte is simpler than the gametophyte and remains attached to the parent gametophyte throughout its life. This sporophyte is dependent upon gametophyte partially or wholly for its nutrition.


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72.

Female cone of Pinus is a

  • Modified needles

  • Modified long shoot

  • Modified dwarf shoot

  • Modified scale


73.

 Development of an embryo without fertilization is called as

  • Apomixis

  • Polyembryony

  • Parthenocarpy

  • Parthenogenesis


74.

Which of the following floral parts forms pericarp after fertilization?

  • Nucellus

  • Outer integument

  • Ovary wall

  • Inner integument


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75.

Prothallus of the fern produces

  • Spores

  • Gametes

  • Both (a) and (b)

  • Cones


76.

Chromosomes are arranged along the equator during

  • Prophase

  • Metaphase

  • Anaphase

  • Telophase


77.

Width of the DNA molecule is

  • 15 Ao

  • 20 Ao

  • 25 Ao

  • 34 Ao


78.

The fleshy receptacle of syconus of fig encloses number of

  • Achenes

  • Samaras

  • Berries

  • Mericarps


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79.

Which one of the following is linked to the discovery of bordeaux mixture as a popular fungicide?

  • Bacterial leaf blight of rice

  • Downy mildew of grapes

  • Loose smut of wheat

  •  Black rust of wheat


80.

Unisexuality of flowers prevents

  • Autogamy, but not geitonogamy

  • Both geitonogamy and xenogamy

  • Geitonogamy, but not xenogam

  • Autogamy and geitonogamy


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