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12901.

Question : Mention any situation where you have gone for DNA fingerprinting?

Answer»
Discussion
12902.

Question : Mention any one striking similarity that is found in the embryos of all vertebrates at an early stage. What is it indicative of?

Answer»

SOLUTION :Zygote DEVELOPS into morula, BLASTULA and gastrula, indicates COMMON ANCESTRY.
Discussion
12903.

Question : Mention any one skeletal difference between ape and man.

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Solution :In apes, lumber curve is ABSENT and pelvic girdle is narrow and elongated. In MAN, LUMBAR curve is well developed and pelvic girdle is BROAD and basin-like.
Discussion
12904.

Question : Mention any four topographic factors that affect vegetation.

Answer»

SOLUTION :(a) LATITUDE (B) Altitude (c) Direction of mountain and (4) Steepness of mountain.
Discussion
12905.

Question : Mention any four sexually transmitted diseases.

Answer»

Solution :a. HEPATITIS - B
b. Genital HERPES.
C. AIDS
d. Gonorrhoea.
Discussion
12906.

Question : Mention any four organs homologous to human hand

Answer»

Solution :Flippers of WHALE, wings of BAT, wings of BIRD and FORELIMB of HORSE.
Discussion
12907.

Question :Mention any four categories of species mentioned in Red data book

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Solution :(a) Extinct (6) Endangered (C) Extinct in wild (d) VULNERABLE.
Discussion
12908.

Question : Mention any four objectives of RCH.

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Solution :Objectives of RCH include-
Creating awareness among people about various reproduction related aspects.
Providing FACILITIES and support for building reproductively healthy society.
INTRODUCING sex education in school
Reduce infant and MATERNAL mortality
Proper information about reproductive organs, adolescence and related changes and hygenic sexual practices.
Equal importance for the male and female CHILD.
Discussion
12909.

Question : Mention any five differences between Microsporogenesis and Megasporogenesis.

Answer»

SOLUTION :
Discussion
12910.

Question : Mention any four areas where DNA fingerprinting can be used.

Answer»

SOLUTION :(a) FORENSIC analysis
(b) PEDIGREE analysis
( C ) Conservation of wild LIFE
(d) Anthropological studies
Discussion
12911.

Question : Mention about the viability of pollen grain

Answer»

Solution :Once the pollen grains are shed, they have to land on the stigma before they lose VIABILITY if they have to bring about fertilisation. The period for which pollen grains remain viable is highly variable and to some EXTENT depends on the prevailing termperature and humidity.
In some cereals such as rice and wheat, pollen grains lose viability within 30 minutes of their release and in some members of Rosacease, Leguminoseae, and Solanaceae, they MAINTAIN viability for month. It is possible to store pollen grains of a large number of species for years in liquid nitrogen `(-196^(@)C)`. Such stored pollen can be used as pollen banks, similar to SEED banks, in crop BREEDING programmes.
Discussion
12912.

Question : Mention about agents of pollination and explain pollination by wind.

Answer»

Solution :Plants use two abiotic (wind and water) and one biotic (animals) AGENTS to achieve pollinations. Majority of plants use biotic agents for POLLINATION. Only a small proportion of plants use abiotic agents. Pollen grains coming in contact with the stigma of a chance factor in both wind the water pollination. To compensate for the uncertainties and associated loss of pollen grains, the flowers produce enormous amount of pollen when compared to the number of ovules available for pollination. Each TYPE of plant possesses specific characteristics as per its agent of pollination.
Pollination by winds: Pollination by wind is mor common amongst abiotic pollinations. Wind pollination also requires that the pollen grains are light and non sticky so that they can be transported in wind currents.
They often possess well exposed stamens and large often -feathery stigma to easily TRAP air borne pollen grains. Wind POLLINATED flowers often have a single ovule in each ovary and numerous flowers packed into an inflorescence, a familiar example is the corn cob. The tassels we see are nothig but the stigma adn style which wave in the wind to trap pollen grains. wind pollination is quite common in grasses
Discussion
12913.

Question :Mention a gene that codes for insecticidal protein in Bt cotton.

Answer»

SOLUTION :CRY 1 AC GENE,
Discussion
12914.

Question : Mention a gene that codes for insecticidal protein in Bt cotton.Name the protein it codes for.

Answer»

SOLUTION :CRY GENE
Discussion
12915.

Question : Mention a gene that codes for insecticidal protein in Bt cotton.

Answer»

SOLUTION :CRY gene/crylAb/cryl Ac/cryllAb
Discussion
12916.

Question : Mention a biodiversity hot-spot in India.

Answer»

Solution :WESTERN GHATS and SRI LANKA, Indo-burma, Himalaya.
Discussion
12917.

Question : Mention the unique flowering phenomenon exhibited by Strobilanthus kunthiana (neel kuranajt).

Answer»

SOLUTION :FLOWER once in 12 YEARS.
Discussion
12918.

Question : Menthyl guanosine triphosphate is added to the 5' end of hnRNA in a process of

Answer»

splicing
CAPPING
tailing
None of these

Solution :(b) : At 5' END of hnRNA, a CAP is formed by modification of GTP into 7-methyl GUANOSINE or `7^(m(G_(ppp)`. This process is called capping and itprotects the mRNA from degradation by NUCLEASES and also.
Discussion
12919.

Question : Menstrul cycle is affected by :

Answer»

PROGESTERONE only
LH only
LH +FSH+oestrogen
Oestrogen only

Answer :C
Discussion
12920.

Question : Menstrual flow - Menstrual cycle

Answer»

Solution :Menstrual flow : The menstrual flow results DUE to breakdown of endometrial LINING OFTHE uterus and its blood vessels which FORMS liquid that comes out through vagina menstruation only occurs if the released OVUM is not fertilised.
Menstrual cycle : Due to changes occurring in level of female sex hormones estrogen and projesterone, cyclic changes occurring in inner wallendometrium of uterus is calld menstrual cycle.
Discussion
12921.

Question : Menstruation cycle is controlled by

Answer»

Oestrogen
Progesterone
Both (A) and (B)
NONE of these

Answer :C
Discussion
12922.

Question : Menstrual flow :

Answer»

Solution :If the released ovum is not FERTILISED breakdown of ENDOMETRIAL living of uterus occurs and its blood VESSELS which forms LIQUID that COMES out through vagina is called menstrual flow.
Discussion
12923.

Question : Menstrual cycle takes how many days?

Answer»

26
28
30
24

Answer :B
Discussion
12924.

Question : Menstrual cycle stops during or after:

Answer»

GESTATION period
Lactational period
45-50 YEAR of age
All of above

Answer :D
Discussion
12925.

Question : Menstrual cycle occurs due to lack of:

Answer»

ESTROGEN
PROGESTERONE
FSH
Oxytocin

ANSWER :B
Discussion
12926.

Question : Menstrual cycle is generally of

Answer»

21 DAYS
28 days
38 days
40 days

Answer :B
Discussion
12927.

Question : Menstrual cycle ceases during pregnancy. (True/False)

Answer»


ANSWER :1
Discussion
12928.

Question : Menstrual cycle is completed in:

Answer»

30 days
31 days
28 days
27 days

Answer :C
Discussion
12929.

Question : Menstrual cycle :

Answer»

Solution :Due to CHANGE in level of FEMALE sex hormone ESTROGEN and progesterone, CYCLIC changes occur in inner WALL of uterus endometrium is called menstrual cycle.
Discussion
12930.

Question : Meninges and CSF

Answer»

SOLUTION :1 MENING give protection to the brain and the spinal cord
2 They arealso nutrivative in function
3 Cerebrospinal fluid acts as SHOCK ABSORBER it protects the brain from mechanical injuries and from desiccation
4 It also maintains constant pressure inside the cranium and regulates the TEMPERATURE
5 CSF helps in exchange of nutriests and waste between the blood and the brain tissue
6 CSF supplies oxygen to the brain
Discussion
12931.

Question : Meningesarecovering of the _____.

Answer»

Heart
Kidney
Brain
Lungs

Answer :C
Discussion
12932.

Question : Mendel's work were rediscovered by ..............

Answer»

Hugo DE VRIES
Tschermak
CARL CORRENS
all the above

ANSWER :D
Discussion
12933.

Question : Mendel’s which law of inheritance is universally acceptable without any exception? State the law.

Answer»

SOLUTION :Mendel’s I law i.e., the law of dominance. The law states that when a pair of contrasting factors for a CHARACTER are present TOGETHER, ONE will dominate over the other.
Discussion
12934.

Question : Mendel's theory is a particulate theory - justify.

Answer»

Solution :Mendel.s THEORY of inheritance, known as the Particulate theory, ESTABLISHES the existence of MINUTE PARTICLES or HEREDITARY units or factors , which are now called as genes.
Discussion
12935.

Question : Mendel's principle of seggregation was based on the separation fo alleles in the garden pea during:

Answer»

EMBRYONIC development
Seed formation
Gamete formation
Pollination

Answer :C
Discussion
12936.

Question : Mendel's principle of segregation means that the germ cells always recived :

Answer»

ONE pair of ALLELES
one QUARTER of the GENES
one of the paired alleles
any pair of alleles

Answer :C
Discussion
12937.

Question : Mendel's law of segregation is based upon the F_(2) ratio of:

Answer»

`1:2`
`3:1`
`9:3:3:1`
`1:1`

ANSWER :B
Discussion
12938.

Question : Mendel.s law of segregation is applicable during

Answer»

FORMATION of GAMETES
fusion of gametes
formation of zygote
formation of gonads

Solution : formation of gametes
Discussion
12939.

Question : Mendel's law of indupendent assortment was based upoon the observation on

Answer»

MONOHYBRID crosscs
DIHYBRID crosses
trihybrid crosses
All of these

ANSWER :B
Discussion
12940.

Question : Mendel.s Law of independent assortment holds good for genes situated on the

Answer»

Non-HOMOLOGOUS chromosomes
Homologous chromosomes
Extra NUCLEAR genetic element
Same chromosome

Solution :Mendel.s Law of independent assortment HOLDS good for genes situated located on the homologous chromosomes.
Discussion
12941.

Question : Mendel's law of independent assortment holds good for genes situated on the

Answer»

Non-homologous chromosomes
Homologous chromosomes
Extra NUCLEAR GENETIC element
Same chromosome

Answer :B
Discussion
12942.

Question : Mendel.s first law is often called

Answer»

LAW of segregation
law of INDEPENDENT ASSORTMENT
law of dominance
Both (A) and (C)

SOLUTION :Both (A) and (C)
Discussion
12943.

Question : Mendelian recombination is due to

Answer»

INDEPENDENT ASSORTMENT
segregation
mutation
linkage

Solution : independent assortment
Discussion
12944.

Question : mendelian experiments were infact the extension and development of hybridisation experiments on pea conducted by

Answer»

KNIGHT only
Goss only
Naudin only
Both Knight and goss

Answer :D
Discussion
12945.

Question : Mendeliandisordersand chormosomaldisorders

Answer»

SOLUTION :
Discussion
12946.

Question : Mendel worked on garden pea for

Answer»

15Years
3 Years
7Years
35years

Solution :Recessive TRAITS express only in HOMOZYGOUS condition.
TERMINAL flower in PEA is a recessive trait.
Discussion
12947.

Question : Mendel was successful in formulating the laws of inheritance whereas his predecessors were not because

Answer»

He studied one clear-cut characterat a time
The CHARACTER studied by him were present on separate chromosomes
Of the right CHOICE of material
He KEPT accurate records of his experiments.

Answer :A
Discussion
12948.

Question : Mendel was not able to say anything about recombination and crossing over because

Answer»

he did not have LARGE strong microscope
he CHOOSE only PURE types
traits he selected were not linked and present on different chromosomes or were for apart.
traits he CLOSED was no genes.

Solution : traits he selected were not linked and present on different chromosomes or were for apart.
Discussion
12949.

Question : Mendel was successful in discovering the principles of inheritance as

Answer»

he TOOK PEA plants for his experiments
he did not encounteer linkage between the genes for the characters he considered
he had an in DEPTH knowledge on HYBRIDISATION
he was a famous mathematician

Answer :B
Discussion
12950.

Question : Mendel studied inheritance for seven pairs of characters in pea. For a study of independent assortment, seven characters can be arranged in 21 possible pairs. If you are told that inone of these of 21 pairs, independent assortment was not observed in repeated later studies, what would be your reaction?

Answer»

It is impossible
All the later workers must have committed mstakes
Mendel MIGHT not have studied cell with 21 combinations
Mendel's principle of independent ASSORTMENT may be WRONG

Answer :D
Discussion