In a type of apomixis known as adventive embryony, embryos develop directly from the

• nucellus or integuments

• synergids or antipodals in an embryo sac

• accessory embryo sacs in the ovule

• zygote

Through which cell of the embryo sac, does the pollen tube enter the embryo sac?

• Egg cell

• Central cell

• Persistant synergid

• Degenerated synergid

Which one of the following represents an ovule, where the embryo sac becomes horse-shoe shaped and the funiculus and micropyle are close to each other?

• Circinotropous

• Anatropous

• Amphitropous

• Atropous

74.

Using imprints from a plate with complete medium and carrying bacterial colonies, you can select streptomycin resistant mutants and prove that such mutations do not originate as adaptation. These imprints need to be used

• only on plates with streptomycin

• on plates with minimal medium

• only on plates without streptomycin

• on plates with and without streptomycin

Which of the following is generally used for induced mutagenesis in crop plants?

• Alpha particles

• X- rays

• UV (260 nm)

• Gamma rays (from cobalt 60)

In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype

• aaBB

• AaBb

• AABB

• aabb

Why is vivipary an undesirable character for annual crop plants ?

• It reduces the vigour of plant

• The seeds cannot be stored under normal conditions for the next season

• The seeds exhibit long dormancy

• It adversely affects the fertility of the plant

Bacillus thuringiensis (Bt) strains have been used for designing novel

• bio- metallurgical technique

• bio- mineralization processes

• bio- insecticidal plants

• biofertilizers

Photosynthetic Active Radiation (PAR) has the following range of wavelengths

• 400- 700 nm

• 450- 950 nm

• 340- 450 nm

• 500- 600 nm

Golden rice is a transgenic crop of the future with the following improved trait

• high lysine (essential amino acid) content

• insect resistance

• high protein content

• high vitamin A content