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8301.

Question : Show diagrammatically the stages of embryonic development from zygote upto implantation in humans.

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Solution :The attachment of fertilized EGG to the uterine wall of mother in placental animal is known as implantation.

a. Ovum
b. The haploid nucleus of the sperm and that of the ovum fuse together to form a diploid zygote.
c. d, e and f - Are the STRUCTURES formed by cleavage. In the 16 celled STAGE, the structure is called MORULA. FINALLY the morula develops a cavity. In this stage, the structure is called blastocyst. It has an outer layer called trophoblast and inner group of cells called inner cell mass. The blastocyst becomes embedded in the endometrium of the uterus. This is called implantation and it leads to pregnancy.
8302.

Question : Show a diagrammatic representation of the mature embryo sac.

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SOLUTION :.
8303.

Question : Short twisted strands of hyphae which serves as anchors for lichens

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mycelium
rhizines
roots
rhizoids

Answer :B
8304.

Question : Shortest phase in the menstrual cycle of women is

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MENSTRUAL phase
luteal phase
ovulatory phase
follicular phase

Answer :C
8305.

Question : Short pieces of DNA synthesized on the lagging strand ______

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SOLUTION :OKAZAKI FRAGMENTS
8306.

Question : Short lived immunity acquired from mother to foetusacross placenta mother's milk to the infant is categorized as

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ACTIVE immunity
passive immunity
celluar immunity
innate or non-specific immunity

Answer :B
8307.

Question : Short - lived immunity acquired from mother to foetus across placenta or through mother's milk to infants is categorised as :

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ACTIVE IMMUNITY
PASSIVE immunity
Cellular immunity
Innate immunity

Answer :B
8308.

Question : short lived immunity acquired from mother to foetus across placenta or through mother's milk to the infant is:

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active IMMUNITY
PASSIVE immunity
cellular immunity
INNATE non SPECIFIC immunity

Answer :B
8309.

Question : Short DNA molecules with known base sequences used for recognition of restriction fragments are called ___________.

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ANSWER :A::B::C
8310.

Question : Shoot meristem tip culture is used to obtain virus-free plants because

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shoot tip is got EASILY
shoot tip grows FASTER
shoot tip has the APICAL bud
shoot MERISTEM tip is always virus free

Answer :A::D
8311.

Question : Short discontinous segment of DNA formed during replication.

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ANSWER :OKAZAKI FRAGMENT
8312.

Question : Short day plants required:

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LIGHT
DARK
Long dark period
Short light period

Answer :C
8313.

Question : Shoot apex forms lateral branches of stem, leaves and (a) Is unidirectional in activity (b) Is present just above youngest leaf primordia (c ) Does not show plastochron periodicity (d) Shows subterminal position

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(a) and (b) are correct
Only (d) is INCORRECT
(a), (b) and (C ) are correct
(c ) and (d) are correct

Answer :1
8314.

Question : Shod distance transport of substances occur by! through

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Diffusion
Cytoplasmic streaming
Vascular SYSTEM
Both (1) & (2)

ANSWER :D
8315.

Question : Shock organ of allergy is

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Spleen
Heart
lungs
kidney

Answer :A
8316.

Question : The movement in touch-me-not plant induced by touch is:

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Thermonasty
Epinasty
Seismonasty
Thigmonasty

Answer :C
8317.

Question : Sheep and goats differ in their

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habit
HABITAT
size
BODY shape HORN size and nose shape

Answer :D
8318.

Question : Sheathing leaf bases is found in :-

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MONOCOT plants
Leguminous Plants
Gymnosperm plants
Pteridophytes

Answer :A
8319.

Question : Sharpey's fibres, are composed of

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Collagen
Elastin
Gelatin
Chitin

ANSWER :A
8320.

Question : Sharbati Sonora' is a:

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Lerma Rojo-64
Sonara-64
Pusa Lerma
Prabhani Kranti

Answer :B
8321.

Question : Sharbati sonora' is a high yielding variety of wheat produced by treating sonora 64 Gamma rays. a. How can we make a new variety by treating it with gamma rays? b. Name this method of plant breeding. .c. Give names of other substances that can be used for this type of c. What are they generally called?

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SOLUTION :a. Now a days plants breeders CHANGE the genotype and PHENOTYPE of the plants according to their desire. This type of mutation for the production of new superior varities is known as mutation breeding. e.g. Sharbati Sonara (wheat)- GAMA RAY mutant of Sonara 64.
b. mutation breeding
c. Chemical mutagens and physical mytagens
d. Mutagens
8322.

Question : Sharbati sonora is a mutant got by using_________

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Thermal NEUTRONS
Gamma radiation
X - rays
UV RADIATIONS

Answer :B
8323.

Question : Sharbati Sonara is a mutant variety of ………………. .

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Potato
Rice
WHEAT
Sugarcane

Solution :Wheat
8324.

Question : Shape, size, cell elongation, ability of roots piercing through hard floors is all due to

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Plasmolysis
Guttation
Turgor pressure
Water potential

Answer :C
8325.

Question : Shape of pyramid in a particular ecosystem is always different in shape. Explain with example.

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Solution :In a FOREST ecosystem the pyramid of number is spindle in shape, it is because the BASE `(T_1)` of the pyramid occupies large sized trees (Producer) which are lesser in number. Herbivores `(T_2)` (Fruit eating birds, elephant and deer) occupying second TROPHIC level, are more in number than the producers. In final trophic level `(T_4)`, TERTIARY consumers (lion) are lesser in number than the SECONDARY consumer `(T_3)` (fox and snake).
8326.

Question : Shape of the chromosome is determined by the position of_____

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ANSWER :CENTROMERE
8327.

Question : Shape of pyramid in a particular ecosystem is always different in shape.Explain with Example.

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SOLUTION :In a forest ECOSYSTEM the PYRAMID of number is spindle in shape, it is because the base `(T_1)` of the pyramid occupies large sized trees (Producer) which are lesser in number. Herbivores `(T_2`) (Fruit eating birds, elephant and deer) occupying second trophic LEVEL, are more in number than the producers. In FINAL trophic level `(T_4)`, tertiary consumers (lion) are lesser in number than the secondary consumer `(T_3)` (fox and snake).
8328.

Question : Shape of chloroplast of Ulothrix is

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star-shaped
band-shaped
girdle-shaped
spinal-shaped

Solution :The chloroplast of ULOTHRIX is girdle-shaped CONTAINING one or more pyrenoids. The THALLUS of Ulothrix is FILAMENTOUS, LONG, unbranched and multicellular. It is a freshwater alga growing on substratum like rocks, sand, etc.
8329.

Question : Shakti, Rattan and Protina are three important lysine rich varieties of

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rice
pulses
wheat
maize

Answer :D
8330.

Question : Sexually transmitted disease (STD) are mainly transmitted through sexual contact. Name any two example of sexually transmitted disease.

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SOLUTION :Gonorrhoea/Syphilis/Genital herpes/Genital warts/Chlamydiasis/Hepatitis-B/AIDS
8331.

Question : Sexually transmitted disease (STD) are mainly transmitted through sexual contact. Explain any two methods adopted to present STDs.

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Solution :AVOID sex with unknown/multiple PARTNER
Always use condoms during coitus.
In case of DOUBT early detection by DOCTOR
8332.

Question :Sexually transmitted diseases (STDs) are those infections and communicable diseases which are transmitted from an infected person to a healthy but susceptible person during unprotected vaginal or anal or oral sexual contact. These are also called silent infections as well as international diseases. These may be bacterial or viral or protozoan or fungal in origin. Out of STDs, chlamydiasis is the most common bacterial STD. A case-controlled study of the prevalence of genital chlamydiasis in a study group of 120 patients with tubal infertility and a control group of another 120 clients following family planning measures. The prevalence was found to 38.3% in the study group while it was found to be 13.3% in the control group. Answer the following questions on STDs: (i) What is causative agent of chlamydiasis? (ii) List the symptoms of it in human female. (iii) What is indicated by the higher prevalence of tubal infertility in the study group than the control group?

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Solution : (i) Bacterium-Chlamydia trachomatis (ii) Symptoms in females Inflammation of CERVIX, UTERUS and fallopian TUBES leading to Pelvie INFLAMMATORY Diseases (PID) causing sterility. (iii) Chlamydiasis increases the prevalence of TUBAL infertility
8333.

Question : Shade loving plants are

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HELIOPHYTES 
Sciophytes
Hydophytes 
XEROPHYTES 

ANSWER :B
8334.

Question : Shade plants have

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More PSII
Large grana
Less PSI
All of these

Answer :D
8335.

Question : Sexually abused children show symptoms of __________.

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FREQUENT URINARY infection
HEAD ache
sore head
migraine

Answer :A
8336.

Question : Sexual reproduction of higher plants include …………….. Stages.

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2
4
3
5

Answer :C
8337.

Question : Sexual reproduction is considered more beneficial than asexual reproduction because

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it is not affected by adverse environmetal conditions
fertilisation is a chance factor
it RAPIDLY MULTIPLIES the population
it ASSISTS in evolution by producing variatins.

Answer :D
8338.

Question : Sexual reproduction involving fusion of two cells in Chlamydomonas is

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isogamy
homogamy
somatogamy
hologamy

Solution :(d) In Chlamydomonas, hologamy INVOLVES the fusion of two young individuals directly, e.g. C. snowiae and isogamy involves fusion of gametes which are SIMILAR in size, structure and physiology, e.g. C.euganetos.
8339.

Question : Sexual reproduction involves formation of the male and female gametes by

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Same individual
Different INDIVIDUALS of the OPPOSITE sex
Different individuals of the same sex
Either A or B

Answer :D
8340.

Question : Sexual reproduction in Spirogyra is an advanced feature because it shows

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physiologically DIFFERENTIATED SEX organs
different size of motile sex organs
same size of motile sex organs
MORPHOLOGICALLY differentsex organs

Solution :(a) In Spirogyra, the sexual reproduction involves the fusion of TWO morphologically indentical ISOGAMETES and physiologically dissimilar anisogamets.This is a case of primitive anisogamy. In this the active gamete is known as the male and the passive as the female.
8341.

Question : Sexual reproduction in Chlamydomonas is 4.

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Oogamous
Isogamous
Anisogamous
All (1), (2) & (3)

Answer :D
8342.

Question : Sexual maturity of House Mouse is attained at the age of

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35 days
15 days
45 days
75 days

Answer :A
8343.

Question :Sex-linked disease is

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diabetes
COLOUR BLINDNESS
deafness
baldness

SOLUTION :colour blindness
8344.

Question : Sex of the baby is determined by the father not by the mother substantiate.

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Solution :Sex chromosome of FEMALES are XX. HENCE all the ova carry X chromosome. Males are heterogametic (XY). Hence `50%` sperms carry X chromosome and 50% carry Y chromosome. A male CHILD is developed when a Y-sperm fertilises the ovum and a female child is formed when the X-sperm fertilises the ovum. Therefore, the statement that the sex of the baby is determined by the father and not by the MOTHER is true.
8345.

Question : Sex of the offspring depends on the fertilizing ovum in

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FRUIT fly, Butter fly
Grass HOPPERS, cockroaches
Fumea, birds
Squash bug, Drosophila

Answer :C
8346.

Question : Sex -linked chromosomes of man are

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<P>Present on autosomes
Present on X-chromosome
Present on SHORT ARMS (P) of Y-chromosome
Long arm (Q) present on Y-chromosome

Answer :B
8347.

Question : Sex determination is based on particular chromosomes in both birds and humans. State two points of difference between their mechanisms of sex determination.

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Solution :i. In birds female has dissimilar CHROMOSOMES (ZW) and male has two similar ZZ chromosomes. But in HUMANS female has XX (homogametic) and male has XY (heterogametic)
II . In humans the sperm is responsible for the sex of child but in birds egg is responsible for the sex of the CHICKS.
8348.

Question : Sex linked characters are always

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A.lethal
B.RECESSIVE
C.dominant
D.pleiotropic

SOLUTION :recessive
8349.

Question : Sex determination is based on particular chromosomes in both birds and humans. State two point of difference between their mechanisms of sex determination.

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SOLUTION :
8350.

Question : Sex determination in plants was first discovered by

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ANSWER :C. E. ALLEN