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Class 10 Class 12

Which one of the following events in not associated with ovulation in human female?

  • Decrease in oestradiol

  • Full development of Graafian follicle

  • Release of secondary oocyte

  • LH surge


A.

Decrease in oestradiol

Oestradiol levels fall after ovulation and before mensuration while, its level peak prior to ovulation. Oestradiol are not associated with ovulation. Decrease in oestradiol level result in the cessation of menstruation. 

Oestradiol levels fall after ovulation and before mensuration while, its level peak prior to ovulation. Oestradiol are not associated with ovulation. Decrease in oestradiol level result in the cessation of menstruation. 


Which of the following layers in an antral follicle is acellular?

  • Granulosa

  • Theca interna

  • Stroma

  • Zona pellucida


D.

Zona pellucida

Follicles that form an antrum during maturation are called antral follicle or Graafian follicle.
During the development of the follicle, a glycoprotein polymer capsule called the zona pellucida which is acellular, forms around the oocyte, separating it from the surrounding granulosa cells. 
This layer remains with the oocyte after ovulation and contains enzymes that catalyse with sperm to allow penetration. 

Follicles that form an antrum during maturation are called antral follicle or Graafian follicle.
During the development of the follicle, a glycoprotein polymer capsule called the zona pellucida which is acellular, forms around the oocyte, separating it from the surrounding granulosa cells. 
This layer remains with the oocyte after ovulation and contains enzymes that catalyse with sperm to allow penetration. 


One of the legal methods of birth control is 

  • abortion by taking an appropriate medicine

  • by abstaining from coitus from day 10-17 of the menstrual cycle. 

  • by having coitus at the time of daybreak

  • by a premature ejaculation during coitus


B.

by abstaining from coitus from day 10-17 of the menstrual cycle. 

one of the legal methods of birth control is periodic in which couple abstain from coitus from day 10 to 17 of the menstrual cycle.
abortion by taking medicine is not a legal method. A daybreak coitus may increase the chances of contraception.

one of the legal methods of birth control is periodic in which couple abstain from coitus from day 10 to 17 of the menstrual cycle.
abortion by taking medicine is not a legal method. A daybreak coitus may increase the chances of contraception.


Which one of the following statements is false in respect of viability of mammalian sperm ?

  • Sperm is viable for only up to 24 hours

  • Survival of sperm depends on the pH of the medium and is more active in alkaline medium

  • Viability of sperm is determined by its motility

  • Sperms must be concentrated in a thick suspension


A.

Sperm is viable for only up to 24 hours

Sperms are viable for 24 h to 48 h , whereas the human ovum is viable only for 24 h.

Sperms are viable for 24 h to 48 h , whereas the human ovum is viable only for 24 h.


Which one of the following is wrong about Chara?

  • upper oogonium and lower round antheridium

  • Globule and nucule present on the same plant

  • Upper antheridium and lower oogonium

  • Globule is male reproductive structure


C.

Upper antheridium and lower oogonium

Both antheridium and oogonium are the males and the female reproductive structure respectively. They have sterile jackets on their surface. In almost all algae of class - Chlorophyceae, the structure like globule ( male sex organ) present lower side, while the nucule (female sex organ) present upper side of sterile vegetative (leaf-like) structure. 

Both antheridium and oogonium are the males and the female reproductive structure respectively. They have sterile jackets on their surface. In almost all algae of class - Chlorophyceae, the structure like globule ( male sex organ) present lower side, while the nucule (female sex organ) present upper side of sterile vegetative (leaf-like) structure.