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Each of the following questions/statemen...

Each of the following questions/statements has four suggested answers.
Choose the correct answer:
Layers of an ovum from outside inside are:-
i. Corona radiata, zona pellucida and vitelline membrane
ii. Zona pellucida, corona radiata and vitelline membrane
iii. Vitelline membrane, zona pellucida and corona radiata
iv. Zona pellucida, vetelline membrane and corona radiata

A

Corona radiata, zona pellucida, vitelline membrane

B

Zona pellucida, corona radiata, vetelline membrane

C

Vitelline membrane , zona pellucida, corona radiata

D

Zona pellucida, vitelline membrane, corona radiata

Text Solution

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Which of the following layers of the ovum undergoes changes to prevent polyspermy when sperm contacts with it ? (a) Corona radiata (b) Plasma membrane (c) Zona pellucida (d) Tunica albuginea

(a) Draw a diagram of the structure of a human ovum surrounded by corona radiata. Label the following parts : (i) Ovum, (ii) Plasma Membrane, (iii) Zona Pellucida (b) State the function of Zona Pellucida.

A cellular layer made up of glycoproteins within Graafian follicle around ovum prevents ectopic pregnancy is (a) corona radiata (b) granulosa (c) Zona pellucida (d) Theca externa

Which of the following statements regarding fertilization is/are correct ? (i) The acrosome is filled with hydrolytic enzymes which help in dissolving the membrane of the ovum at the time of fertilization. (ii) Vitelline membrane is the first membrane to be faced by sperms while trying to fuse with the ovum . (iii) There must be synchronicity in the release of ovum and entry of sperm for the formation of zygote . (iv) The meiotic division of the secondary oocyte is concluded with the entry of male gamete.

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.

Read the following statements and mark the correct option- (i)Grana lamellae have both PS-I and PS-II. (ii) ph inside the thylakoid lumen decreases when H^+ gradient is established across thlakoid membrane (iii) During reduction of NADP to NADPH + H^+ protons are removed from thylakoid lumen (iv) Melvin Calvin used radioctive 14^C in a dicot plant to elucidate path of carbon in biosynthetic phase of photosynthesis.

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.

Select the correct answer out of the four available choices given under question : The space between the cell wall and plasma membrane in plasmolysed cell is filled with: (i) isotonic solution (ii) hypotonic solution (iii) hypertonic solution (iv) water

Consider the following four statements and select the correct option stating which ones are true (T) and which ones are false (F). (i) The scrotum acts as a thermoregulator, maintaining the testes at a temperature 2^(@) lower than that of the body (ii) Corona radiate layer of the ovum prevents polyspermy. (iii) Middle part of ear is derived from the endoderms layer. (iv) The hormone, human chorionic gonadotropin facilitates parturition by softening the connective tissue of the public symphysis.

Consider the following four statements and select the correct option stating which ones are true (T) and which ones are false (F). (i) The scrotum acts as a thermoregulator, maintaining the testes at a temperature 2^(@) lower than that of the body (ii) Corona radiate layer of the ovum prevents polyspermy. (iii) Middle part of ear is derived from the endoderms layer. (iv) The hormone, human chorionic gonadotropin facilitates parturition by softening the connective tissue of the public symphysis.

CENGAGE BIOLOGY ENGLISH-HUMAN REPRODUCTION -Assertion -Reasoning Question
  1. Each of the following questions/statements has four suggested answers....

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  2. Assertion: Scrotum provides optimum temperature conditions for spermat...

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  3. Assertion: The process of reproduction does not suffer if one ovary is...

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  4. Nothing lives for ever, yet life continues. What does it mean?

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  5. Assertion: Placenta is connected to the fetus by an umbilical cord. ...

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  6. Assertion: Placenta is contra-deciduate and even the fetal placenta is...

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  7. Assertion: Polar bodies have small amount of cytoplasm. Reason: It i...

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  8. Assertion: Ovulation takes place when the blood level of luteinizing h...

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  9. Assertion: Umbilical cord contain 100% fetal blood. Reason: It has s...

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  10. Assertion: The activation of sperm is called capacitation Reason: C...

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  11. Assertion: Before fusion, spermatozoa have to penetrate egg membrane....

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  12. Assertion : In post natal life , oocyte development occurs in mature f...

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  13. Assertion : Placenta is combined structure of foetal tissue & maternal...

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  14. Assertion: Seminal vesicle is known as the accessory sex organ of male...

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  15. Assertion: Testes are retroperitoneal organ in man. Reason: Peritone...

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  16. Assertion: Cervix contains the largest and the most powerful sphincter...

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  17. Assertion: In ovarian cycle, corpus luteum is exocrine gland. Reason...

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