31. Select the
incorrect statement.
(1) Male fruit fly is heterogametic
(2) In male grasshoppers 50% of sperms have no sex-chromosome
(3) In domesticated fowls, sex of progeny depends on the
type of sperm rather than egg
(4) Human males have one of their sexchromosome much shorter
than the other
Answer (3) In domesticated fowls, sex of progeny depends on the type of
sperm rather than egg
32. DNA precipitation
out of a mixture of biomolecules can be achieved by treatment with
(1) Isopropanol (2) Chilled ethanol (3) Methanol at room
temperature (4) Chilled chloroform
Answer (2) Chilled
ethanol
33. Select the
correct group of biocontrol agents.
(1) Bacillus thuringiensis, Tobacco mosaic virus, Aphids
(2) Trichoderma, Baculovirus, Bacillus thuringiensis
(3) Oscillatoria, Rhizobium, Trichoderma
(4) Nostoc, Azospirillium, Nucleopolyhedrovirus
Answer ( (2)
Trichoderma, Baculovirus, Bacillus thuringiensis
34. Select the
incorrect statement.
(1) Inbreeding increases homozygosity
(2) Inbreeding is essential to evolve purelines in any
animal.
(3) Inbreeding selects harmful recessive genes that reduce
fertility and productivity
(4) Inbreeding helps in accumulation of superior genes and
elimination of undesirable genes
Answer (3)
Inbreeding selects harmful recessive genes that reduce fertility and
productivity
35. Match the
following organisms with the products they produce
(a) Lactobacillus (i)
Cheese
(b) Saccharomyces cerevisiae
(ii) Curd
(c) Aspergillus niger (iii) Citric Acid
(d) Acetobacter aceti (iv) Bread
(v) Acetic Acid
Select the correct
option.
(a) (b) (c) (d)
(1) (ii) (iv) (v)
(iii)
(2) (ii) (iv) (iii)
(v)
(3) (iii) (iv) (v)
(i)
(4) (ii) (i) (iii)
(v)
36. What is the direction of the movement of
sugars in phloem?
(1) Non-multidirectional (2) Upward (3) Downward (4)
Bi-directional
Answer (4)
Bi-directional
37. In some plants,
the female gamete develops into embryo without fertilization. This phenomenon
is known as
(1) Autogamy (2)
Parthenocarpy (3) Syngamy (4) Parthenogenesis
Ans: (4)
Parthenogenesis
38. Persistent
nucellus in the seed is known as
(1) Chalaza (2) Perisperm (3) Hilum (4) Tegmen
Ans: (2) Perisperm
39. What map unit
(Centimorgan) is adopted in the construction of genetic maps?
(1) A unit of
distance between two expressed genes representing 10% cross over.
(2) A unit of distance between two expressed genes
representing 100% cross over.
(3) A unit of distance between genes on
chromosomes, representing 1% cross over.
(4) A unit of
distance between genes on chromosomes, representing 50% cross over.
ans: (3) A unit of distance between genes on chromosomes, representing 1% cross over.
40. What would be the
heart rate of a person if the cardiac output is 5 L, blood volume in the
ventricles at the end of diastole is 100 mL and at the end of ventricular
systole is 50 mL?
(1) 50 beats per minute (2) 75 beats per minute (3) 100 beats per minute (4) 125 beats
per minute
Ans: (3) 100 beats per minute