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NEET Biology Solved Question Paper 2007

Multiple Choice Questions

71.

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

72.

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

Egg cell
Central cell
Persistant synergid
Degenerated synergid

73.
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

Amphitropous

In an amphitropous ovule, the embryo sac becomes horse- shoe shaped and the funiculus and micropyle are close to each other. It is found in Alismaceae, Butamaceae families.

Circinotropous ovule- The nucellus and the axis are in the same line in the beginning but due to rapid growth on one side, the ovule becomes anatropous.

Anatropous ovule is a completely inverted ovule turned back 180 $°$ on its stalk.

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

75.

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)

76.

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