Q. Citrus tristeza virus is transmitted through -
1) Aphid
2) Thrips
3) Nematode
4) Plant hopper
Q. Which one of the pathogens is monocylic?
1) Ustilago
2) Alternaria
3) Phytophthora
4) Puccinia
Q. Caenocytic mycellium is found in -
1) Mastigomycotina
2) Deuteromycotina
3) Ascomycotina
4) None of these
Q. Penicillin acts on-
1) Cell wall
2) RNA
3) Cell membrane
4) None of these
Q. Blue colour tag is issued for -
1) Foundation seed
2) Certified seed
3) Nucleus seed
4) Foundation seed
Q. Generally, cereals are deficient in -
1) Protein
2) Tryptophan
3) Methionine
4) Lysine
Q. The book 'Mutation Research' is written by -
1) Muller
2) Stadler
3) Nilsson-Enle
4) Auerbach
Q. Each anther has how many pollen sacs?
1) Four
2) Two
3) One
4) Three
Q. Rice and wheat has how many stamens?
1) 3,3
2) 6,3
3) 3,6
4) 6,6
Q. The chemical, which attracts opposite sex insects of a species, is known as -
1) Hormones
2) Allomones
3) Kairomones
4) Pheromones
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