Multiple Choice QuestionsWhich one of the following pairs of geographical areas show maximum biodiversity in our country?
Sunderbans and Rann of Kutch
Eastern Ghats and West Bengal
Eastern Himalaya and Western Ghats
Kerala and Punjab
Genetic diversity in agricultural crops is threatened by
introduction of high yielding varieties
intensive use of fertilizers
extensive intercropping
intensive use of biopesticides
One of the ex situ conservation methods for endangered species is
wildlife sanctuaries
biosphere reserves
cryopreservation
national parks
A young drug addict used to show symptoms of depressed brain activity, feeling of calmness, relaxation and drowsiness. Possibly he was taking
amphetamine
marijuna
pethidine
valium
Antigen binding site in an antibody is found between
two light chains
two heavy chains
one heavy and one light chain
either between two light chains or between one heavy and one light chain depending upon the nature of antigen
Which one of the following events is correctly matched with the time period in a normal menstrual cycle?
Release of egg: 5th day
Endometrium regenerates: 5 - 10 days
Endometrium secretes nutrients for implantation : 11 - 18 days
Rise in progesterone level : 1 - 15 days
B.
Endometrium regenerates: 5 - 10 days
Menstruation is a part of the female reproductive cycle that starts when girls become sexually mature at the time of puberty. Menstrual cycle is the regular natural change that occurs in the female reproductive system. Parts of the body involved during menstrual cycle include brain, pituitary gland, uterus and cervix, ovaries, fallopian tubes and vagina.
The above mentioned options occur in a normal menstrual cycle in a time period of:
(i) Release of egg called ovulation usually takes place roughly 14 days after the first day of the start of a period for fertilization.
(ii) Following menstruation endometrium regenerates about 8 days during the proliferative phase.
(iii) Implantation occurs after 7 days of fertilization.
(iv) Progesterone level rises after ovulation which occurs after 14 days.
A tumor inducing plasmid widely used in the production of transgenic plants is that of
Escherichia coli
Bacillus thuringiensis
Staphylococcus aureus
Agrobacterium tumefaciens
Which one of the following statement pertaining to pollutants is correct?
DDT is a non-biodegradable pollutant
Excess fluoride in drinking water causes osteoporosis
Excess cadmium in drinking water causes black foot disease
Methylmercury in water may cause "Itai ltai" disease
The "cri-du-chat" syndrome is caused by change in chromosome structure involving
deletion
duplication
inversion
translocation
Grain colour in wheat is determined by three pairs of polygenes. Following the cross AABBCC (dark colour) x aabbcc (light colour), in F2 generation what proportion of the progeny is likely to resemble either parent?
None
Less than 5 percent
One third
Half
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