Development of an embryo without fertilization is called as

Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

71.

A fern differs from a moss in having

  • Swimming archegonia

  • Swimming antherozoids

  • Independent gametophytes

  • Independent sporophytes


72.

Female cone of Pinus is a

  • Modified needles

  • Modified long shoot

  • Modified dwarf shoot

  • Modified scale


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73.

 Development of an embryo without fertilization is called as

  • Apomixis

  • Polyembryony

  • Parthenocarpy

  • Parthenogenesis


D.

Parthenogenesis

Parthenogenesis (virgin origin) is the development of an embryo from an unfertilized egg or if a spermatozoan does penetrate the egg, there is no union of male and female pronuclei. It is found in many plants (dandelions and hawk weeds) and (aphids and honey bees).


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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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