WHEN DO THE OOGENESIS AND THE SPERMATOGENESIS INITIATE IN HUMAN FEMALES AND MALES RESPECTIVELY ?

WHEN DO THE OOGENESIS AND THE SPERMATOGENESIS INITIATE IN HUMAN FEMALES
AND MALES RESPECTIVELY ?
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1 Answer

Answer :

ANS. OOGENESIS AT THE FOETAL LIFEAND SPERMATOGENISIS STARTS AT PUBERTY.
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DESCRIBE THE PROCESS OF OOGENESIS IN HUMAN FEMALE AND DIFFERENTIATE IT WITH SPERMATOGENESIS ON THE BASIS OF TIME OF INITIATION AND THE PRODUCTS FORMED.

Description : DESCRIBE THE PROCESS OF OOGENESIS IN HUMAN FEMALE AND DIFFERENTIATE IT WITH SPERMATOGENESIS ON THE BASIS OF TIME OF INITIATION AND THE PRODUCTS FORMED.

Last Answer : ANS. OOGENESIS : DIAGRAMMATIC REPRESENTATION AS GIVEN IN NCERT. DIFFERENCES BETWEEN : OOGENESIS SPERMATOGENESIS (i) STARTS DURING FOETAL LIFE (i) STARTS DURING PUBERTY (ii)PRODUCTS: OVUM (ii) SPERMS

WRITE THE FUNTION OF EACH OF THE FOLLOWING: (a) MIDDLE PIECE OF HUMAN SPERM (b) LUTEINIZING HORMONE IN HUMAN MALES

Description : WRITE THE FUNTION OF EACH OF THE FOLLOWING: (a) MIDDLE PIECE OF HUMAN SPERM (b) LUTEINIZING HORMONE IN HUMAN MALES

Last Answer : ANS. (a) PROVIDES ENERGY FOR MOVEMENT DUE TO PRESENCE OF MITOCHONDRIA. (c) STIMULATES SYNTHESIS AND SECRETION OF ANDROGENS.

(a) IN WHICH PART OF HUMAN FEMALE REPRODUCTIVE SYSTEM DO THE FOLLOWING EVENTS TAKE PLACE. (i) RELEASE OF FIRST POLAR BODY (ii) RELEASE OF SECOND POLAR BODY (iii) FERTILISATION (iv) IMPLANTATION (b) NAME TWO HORMONES SECREATED ONLY DURING PREGNANCY.

Description : (a) IN WHICH PART OF HUMAN FEMALE REPRODUCTIVE SYSTEM DO THE FOLLOWING EVENTS TAKE PLACE. (i) RELEASE OF FIRST POLAR BODY (ii) RELEASE OF SECOND POLAR BODY (iii) FERTILISATION (iv) IMPLANTATION (b) NAME TWO HORMONES SECREATED ONLY DURING PREGNANCY.

Last Answer : ANS (a) (i) OVARY (ii) FALLOPIAN TUBE (iii) AMPULLA-ISTHAMUS JUNCTION OF FALLOPIAN TUBE (iv) ENDOMETRIUM LINING OF UTERUS (b) HUMAN CHORIONIC GONADOTROPIN AND HUMAN PLACENTAL LACTOGEN

WHAT IS APOMIXIS? DESCRIBE ITS IMPORTANCE?

Description : WHAT IS APOMIXIS? DESCRIBE ITS IMPORTANCE?

Last Answer : ANS. IT IS THE PROCESS OF DEVELOPMENT OF SEEDS WITHOUT FERTILISATION. EXAMPLE: SOME SPECIES OF ASTERACEAE AND GRASSES. IMPORTANCE: APOMICTIC GENES CAN BE INTRDUED IN HYBRID SEED INDUSTRY.

(A) MENTION ANY FOUR STRATEGIES ADOPTED BY FLOWERING PLANTS TO PREVENT SELF-POLLINATION. (B) DEFINE THE TERM EMASCULATION.

Description : (A) MENTION ANY FOUR STRATEGIES ADOPTED BY FLOWERING PLANTS TO PREVENT SELF-POLLINATION. (B) DEFINE THE TERM EMASCULATION.

Last Answer : ANS.(a) (i) SELF INCOMPATIBILITY (ii) PRODUCTION OF UNICELLULAR FLOWERS (iii) ANTHERS AND STIGMA ARE PLACED AT DIFFERENT POSITIONS. (iv) MATURATION OF ANTHER AND STIGMA IS NOT ... EMASCULATION: REMOVAL OF ANTHER BEFORE MATURITY SO AS TO ENSURE CROSS POLLINATION IN SELF POLLINATING FLOWERS.

DESCRIBE THE CONTRACEPTIVE ACTIONS OF IUDs.

Description : DESCRIBE THE CONTRACEPTIVE ACTIONS OF IUDs.

Last Answer : ANS. (i) INCREASES PHAGOCYTOSIS OF SPERMS (ii) SUPPRESS SPERM MOTILITY (iii) SUPPRESS FERTILISING CAPACITY OF SPERMS (iv) MAKES CERVIX HOSTILE TO SPERMS.

DIFFERENTIATE BETWEEN MORULA AND BLASTULA STAGES OF MAMMALIAN EMBRYO.

Description : DIFFERENTIATE BETWEEN MORULA AND BLASTULA STAGES OF MAMMALIAN EMBRYO.

Last Answer : ANS. MORULA: (i) 8 TO 16 CELLED STAGE EMBRYO (ii) SOLID WITHOUT ANY CAVITY BLASTULA: (i) 32 CELLED STAGE EMBRYO. (ii) HOLLOW WITH A CAVITY CALLED BLASTOCOEL

WHAT IS CORPUS LUTEUM ? UNDER WHAT CONDITIONS DOES IT UNDERGO DEGENERATION ?

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Last Answer : ANS. THE CORPUS LUTEUM IS FORMED IN THE MAMMALIAN OVARY FROM RUPTURED GRAAFIAN FOLLICLE AFTER OVULATION. IT DEGENERATES IN THE ABSENCE OF FERTILISATION, AS THE LEVEL OF FSH AND LH DROPS.

STATE ONE ADVANTAGE AND ONE DISADVANTAGE OF CLEISTOGAMY.

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Last Answer : ANS. ADVANTAGE: ASSURED SEED SET DISADVANTAGE: INBREEDING DEPRESSION.

WHY IS THE PROCESS OF FERTILISATION IN A FLOWERING PLANT REFFERED TO AS DOUBLE FERTILISATION ?

Description : WHY IS THE PROCESS OF FERTILISATION IN A FLOWERING PLANT REFFERED TO AS DOUBLE FERTILISATION ?

Last Answer : ANS. DOUBLE FERTILISATION= SYNGAMY + TRIPLE FUSION SYNGAMY= ONE MALE GAMETE + EGG--- ZYGOTE(n) TRIPLE FUSION= ANOTHER MALE GAMETE+ POLAR NUCLEI-PRIMARY ENOSPERM NUCLEUS(3n)

WRITE THE LOCATION AND FUNCTION OF SERTOLI CELLS IN HUMANS.

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Last Answer : ANS. IN THE SEMINIFEROUS TUBULES OF TESTIS, NOURISHES DEVELOPING SPERMS.

AT WHAT STAGE IS THE MAMMALIAN EMBRYO IMPLANTED IN THE UTERUS ?

Description : AT WHAT STAGE IS THE MAMMALIAN EMBRYO IMPLANTED IN THE UTERUS ?

Last Answer : ANS. AT THE BLASTOCYST STAGE.

NAME THE PROTECTIVE SUBSTANCE PRESENT IN THE POLLEN ENVELOPE TO TIDE OVER ADVERSE CONDITIONS.

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Last Answer : ANS. SPOROPOLLENIN.

NAME THE TYPE OF FLOWER WHICH FAVOURS CROSS POLLINATION.

Description : NAME THE TYPE OF FLOWER WHICH FAVOURS CROSS POLLINATION.

Last Answer : ANS. CHASMOGAMOUS.

WHAT IS PERISPERM ?

Description : WHAT IS PERISPERM ?

Last Answer : ANS. THE RESIDUAL NUCELLUS, WHICH PERSISTS IN THE SEEDS IS CALLED AS PERISPERM.

NAME THE PHENOMENON AND ONE BIRD WHERE THE FEMALE GAMETE DIRECTLY DEVELOPS INTO A NEW ORGANISM.

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Last Answer : ANS. PARTHENOGENESIS, TURKEY.

WHY ARE DATE PALMS REFFERED TO AS DIOECIOUS ?

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Last Answer : ANS. BECAUSE THEY HAVE UNISEXUAL FLOWERS BORNE ON SEPARATE PLANTS.

WHAT TERM IS GIVEN BY YOU TO THE GROUP OF INDIVIDUALS WHICH ARE GENETICALLY AND MORPHOLOGICALLY IDENTICAL ?

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The process of spermatogenesis and oogenesis in most vertebrates are under the influence of which hormone ?

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Are 'females' generally worse in the field of comedy than 'males'?

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Why do sex linked traits appear more in males than in females? -Biology

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What influences how people understand the behaviors that are expected of females and males in today's society?

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(i) ……………….. is defined as the number of females per thousand males in any given population. (Demography / Sex ratio / Fertility)

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Last Answer : Choose the correct alternative and complete the statements : (i) .. is defined as the number of females ... in (1971 / 1991 / 1994)

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The percentage of literates in India is : (a) almost equal among males and females (b) lower among males than females (c) higher among males than females (d) lower in urban areas than in rural areas

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Last Answer : Ans: (c)

More creatinine is excreted by (A) Adult males (B) Adult females (C) Children (D) Pregnant women

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Sex-ratio is calculated as : (1) No. of children per 1,000 people in a Country. (2) No. of males per 1,000 females in a Country. (3) No. of females per 1,000 males in a Country. (4) No. of people per 1,000 children in a Country.

Description : Sex-ratio is calculated as : (1) No. of children per 1,000 people in a Country. (2) No. of males per 1,000 females in a Country. (3) No. of females per 1,000 males in a Country. (4) No. of people per 1,000 children in a Country.

Last Answer : (3) No. of females per 1,000 males in a Country. Explanation: Sex ratio is used to describe the number of females per 1000 of males in a region or country. Like most sexual species, the ... As per the 2011 Census, Sex Ratio in India currently stands at 943 females available for every 1000 males.

Which of the following is the correct description of the term 'sex ratio' as used in context of the census? (1) Number of females per 1000 persons (2) Number of females in a sample of 1000 persons (3) Number of males per 1000 females (4) Number of females per 1000 males

Description : Which of the following is the correct description of the term 'sex ratio' as used in context of the census? (1) Number of females per 1000 persons (2) Number of females in a sample of 1000 persons (3) Number of males per 1000 females (4) Number of females per 1000 males

Last Answer : (4) Number of females per 1000 males

Which of the following is the correct description of the term sex-ratio as used in the context of the census of population? (1) Number of males per 1000 females. (2) Number of females per 1000 males. (3) Number of females per 100 males. (4) Number of females in a sample of 1000 persons.

Description : Which of the following is the correct description of the term sex-ratio as used in the context of the census of population? (1) Number of males per 1000 females. (2) Number of females per 1000 males. (3) Number of females per 100 males. (4) Number of females in a sample of 1000 persons.

Last Answer : (2) Number of females per 1000 males. Explanation: As per the 2011 Census, Kerala has the highest literacy rate of 93.11% in India. Among states, it is followed by Mizoram (91.58%) and Tripura (87.75%) at second and third positions respectively.

In India, as per their 2001 Census, the sex-ratio (females per 1000 males) is – (1) 930 (2) 934 (3) 927 (4) 933

Description : In India, as per their 2001 Census, the sex-ratio (females per 1000 males) is – (1) 930 (2) 934 (3) 927 (4) 933

Last Answer : (4) 933 Explanation: As per the Census findings overall Sex ratio in India has declined over a period of time. It was 946 female per 1000 male in the year 1951 and declined to 927 in 1991. In the ... 1000 males. In India, as per their 2011 census, the sex-ratio (females per 1000 males) is 943.