221. Heterosis is

A Hybrid incompatibility
B Hybrid vigour
C Hybrid sterility
D Structural hybridity
Answer :   Hybrid vigour
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222. Palm oil is obtained from

A Elaeis
B Olea
C Phoenix
D Cocos
Answer :   Elaeis
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223. Latex of which plant is a substitute for para rubber

A Winged bean
B JoJoba
C Guayule
D Leucaena
Answer :   Guayule
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224. Which of the following is a biofertilizer

A Funaria
B Fern
C Anabena
D Fungus
Answer :   Anabena
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225. Which of the following plant cells will show totipotency?

A Sieve tubes
B Xylem vessels
C Meristem
D Cork cells
Answer :   Meristem
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226. Queen is specified for

A Administration
B Making hive
C Egg laying
D Collection of food
Answer :   Egg laying
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227. Most durable wood belongs to

A Cedrus deodara
B Dalbergia sissoo
C Shorea robusta
D Tectona grandis
Answer :   Tectona grandis
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228. Silkworm is

A Beetle
B Worm
C Fly
D Moth
Answer :   Moth
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229. Malt is prepared from

A Rice
B Barley
C Wheat
D Citrus
Answer :   Barley
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230. Somaclones are obtained by

A plant breeding
B irradiation
C genetic engineering
D tissue culture
Answer :   tissue culture
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