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A : All copulations do not lead to f...

A : All copulations do not lead to fertilisation and pregnancy .
R : Fertillsation can occur if the ovum and sperms are transported simultaneously to the ampullary - isthmic junction

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion then mark (1)

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion then mark (2)

C

If Assertion is true statement but Reason is false then mark (3)

D

If both Assertion and Reason are false statement then Mark (4)

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Assertion: All copulations do not lead to the fertilisation and pregnancy. Reason: Fertilisation can occur only if the ovum and sperms are transported simultaneously to the ampullary isthmic junction.

Why do all copulations not lead to fertilisation and pregnancy ? The root cause is ______

Fertilisation in humans is practically feasible only if i.The ovum and sperm are transported simultaneously to ampullary-isthmic junction of the cervix. ii.The sperm are transported into cervix within 48 hours of release of ovum in uterus. iii.The sperm are transported into vagina just after the release of ovum in fallopian tube. iv.The ovum and sperm are transported simultaneously to ampullary-isthmic junction of the fallopian tube.

A : Lack of menstruation may be indicative of pregnancy R : Menstruation only occurs if the released ovum is fertilised

which of the following statements regarding fertilization and implantation are incorrect ? I. During fertilization , a sperm first comes in contact with the corona radiata cells produced by the ovum. II. Fertilization occurs only if sperm and ovum are simultaneously transported to the ampullary region. III. Implantation occurs about 7 days after fertilization . IV. The continuous division of morula leads to the formation of zygote.

Fill up the blanks in the following paragraph by selecting the correct option. During copulation (coitus) semen is released by the penis into the vagina and is called (i)._____.the ovum released by the ovary is transported to the (ii)._____where (iii).______takes place during fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of (iv)._____The secretions of the (v)._____help the sperm enter into the cytoplasm of the ovum.

Oxygen is of vital importance for all of us . Oxygen enters the body via the lungs and is transported to the tissues in our body by blood . There it can deliver energy by the oxidation of sugars. C_(6)H_(12)O_(6) + 6O_(2) rarr 6CO_(2) + 6H_(2)O This reaction releases 400 KJ of energy per mole of oxygen O_(2) uptake by blood is at four heme (Hm) group in this protein hemoglobin (Hb). Free Hm consists of an Fe^(2+) giving HmO_(2) complex. Carbon monoxides can be complexed similarily giving a Hm CO complex . CO is poison as it bonds more strongly to Hm than O_(2) does. The equilibrium constant K_(f) for the reaction: Hm+ CO hArr HCO " "........(i) is 1000 times larger than the equilibrium constant K_(2) for the reaction: Hm + CO_(2) hArr HmO_(2)" " ........(ii) Each Hb molecules can take up four molecules of O_(2) absorbs a fraction of this amount, depending on the oxygen pressure , as shown in figure1 (curve 1) . Also shown are the curve (2) and (3) for blood with two kinds of dificient Hb . These occur in patients with certain hereditary diseases. Relevant data , O_(2) pressure in lungs is 15 KPa , in the muscles it is 2KPa . The maximum flow of blood through heart and lungs is 4 xx 10^(-4)m^(-3)s^(-1) . The red cells in blood occupy 40% of the volume, inside the cells the concentration of Hb has a molar mass of 64 kg "mol"^(-1) R=8.314 J "mol"^(-1) K^(-1) , T=298k . Using the relation between K and the standard Gibbs energy DeltaG^(@) for a reaction, calculated the difference between the DeltaG^(@) values for the home reactions (i) and (ii).

AAKASH INSTITUTE ENGLISH-HUMAN REPRODUCTION-Assignment ( Section - D ) (Assertion - Reason Type Question ) (In the following question a statement of assertion (A) is followed by a statement of reason (R )
  1. A : if both the ovaries are removed after the first trimester o...

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  2. A : placenta is connected to the embryo through an umbilical cor...

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  3. A : All copulations do not lead to fertilisation and pregnancy ....

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  4. A : Lack of menstruation may be indicative of pregnancy R : ...

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  5. A : LH acts on Sertolic cells for release of certain factors re...

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  6. A : The first sign of growing foetus may be noticed by listeni...

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  7. A: Leyding 's cells synthesise and secrete festicular hormones ca...

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  8. A : In spermatogenesis the first haploid forms are spermatids. R...

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  9. A : Presence or absence of hymen is not a reliable inducator of v...

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  10. A : After menopause the levels of blood gonadotropins will rise ...

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  11. A : The secretions of male accessory glands constitute the semi...

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  12. A : Corpus luteum begins to atrophy after a short life of 10 to ...

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  13. A : Most birds posses only the left ovary and left oviduct for...

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  14. A : The most immediate effect of FSH is the maturation of exis...

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  15. A : The morula passes through the phase of compaction produces ...

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  16. A : Developments is the emergence of a multicellular organism f...

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  17. A : Synthesis of milk is stimulated by rise in the level of ox...

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  18. A : Blastocyst undergoes gastrulation to produce the three germinal...

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  19. A : The scrotum acts as temperature regulator for the testes ...

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  20. A : Fertilin protein is present in the egg membrane R : it help...

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