71.

A fern differs from a moss in having

• Swimming archegonia

• Swimming antherozoids

• Independent gametophytes

• Independent sporophytes

Female cone of Pinus is a

• Modified needles

• Modified long shoot

• Modified dwarf shoot

• Modified scale

 Development of an embryo without fertilization is called as

• Apomixis

• Polyembryony

• Parthenocarpy

• Parthenogenesis

Which of the following floral parts forms pericarp after fertilization?

• Nucellus

• Outer integument

• Ovary wall

• Inner integument

Prothallus of the fern produces

• Spores

• Gametes

• Both (a) and (b)

• Cones

Chromosomes are arranged along the equator during

• Prophase

• Metaphase

• Anaphase

• Telophase

Width of the DNA molecule is

• 15 A^o

• 20 A^o

• 25 A^o

• 34 A^o

The fleshy receptacle of syconus of fig encloses number of

• Achenes

• Samaras

• Berries

• Mericarps

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

Unisexuality of flowers prevents

• Autogamy, but not geitonogamy

• Both geitonogamy and xenogamy

• Geitonogamy, but not xenogam

• Autogamy and geitonogamy