In twenty-eight day human ovarian cycle, ovulation occurs on

Choose the correct answer from each of the four options given below:

On which day of the menstrual cycle does ovulation take place?

 Differentiate between the following pairs on the basis of what is indicated in the brackets.

Testosterone and Oestrogen [organ which secretes].

The diagram given below represents a system in the human body.

Study the diagram and answer the following questions:

Identify the system.

Give appropriate biological or technical terms for the following:

The onset of menstruation in a young girl.

The diagram given below represents a system in the human body.

Study the diagram and answer the following questions:

 Mention the number and the name of the part involved in fertilization and

Implantation from the above diagram.

The diagram given below represents a system in the human body.

Study the diagram and answer the following questions:

 Name the two hormones secreted by 1.

Arrange the phases of the menstrual cycle in the correct order.

$1)$ Proliferative
$2)$ Menstrual
$3)$ Ovulatory
$4)$ Secretory

The diagram given below represents a system in the human body.

Study the diagram and answer the following questions:

Label the parts marked 5 and 6.

Given below are certain groups of terms. In each group, the first pair indicates a relationship between the two terms. Rewrite and complete the second pair on a similar basis.

Uterus : Implantation :: Fallopian tube : _____.