4N Term 3 Rev WS 5: Repro in Plants & Humans

4N Term 3 Rev WS 5:

Repro in Plants & Humans

By Sarah Ang

Open Ended

a and b) Identify structure X and name the process that has led to the development of structure X.

Open Ended

Describe how does the tip of structure X eventually enters the ovule in the flower.

Describe how does the tip of structure X eventually enters the ovule in the flower.

The pollen tube secretes enzymes to digest tissues of the stigma, style and ovary. [1]

This enables it to penetrate through the style [1] and enter the ovule through the micropyle [1].

Multiple Choice

Identify the structures X, Y and Z.

• X is penis,

  Y is sperm duct,

  Z is testis

• X is penis, Y is urethra, Z is testis

• X is penis, Y is sperm duct, Y is ovary.

Multiple Choice

What is the function of the urethra?

• Produces urine and semen out of the body.

• Transports urine and semen out of the body.

• Transports only semen out of the body.

• Where fertilisation of sperm and egg takes place.

Multiple Choice

What is the function of the testes?

• Produces seminal fluid that nourishes the sperms

• Produces urine and male sex hormones

• Produces sperms and male sex hormones

Multiple Choice

What is the function of the scrotum?

• Contains urine while awaiting for its discharge.

• Provides sperms with a suitable temperature for proper development.

• Produces sperm and male sex hormones.

• Provides testosterone with a suitable temperature for proper development.

Multiple Choice

Identify the structures X, Y and Z.

• X is ovary, Y is uterus, Z is vagina.

• X is ovary, Y is vagina, Z is oviduct.

• X is ovary, Y is uterus, Z is oviduct.

• X is ovary, Y is urethra, Z is vagina.

Multiple Choice

What is the function of the vagina?

• Produces female sex hormones oestrogen and progesterone.

• Site of implantation of the embryo and its development.

• Receives the semen during sexual intercourse.

• Site of fertilisation between the egg and the sperms.

Multiple Choice

What is the function of the uterus?

• Produces female sex hormones oestrogen and progesterone.

• Site of implantation of the embryo and its development.

• Receives the semen during sexual intercourse.

• Site of fertilisation between the egg and the sperms.

Multiple Choice

What is the function of the ovaries?

• Produces female sex hormones oestrogen and progesterone only.

• Releases mature eggs and produces female sex hormones.

• Receives the semen during sexual intercourse.

• Site of fertilisation between the egg and the sperms.

Open Ended

With reference the figure, describe the changes in the levels of estrogen and progesterone between day 5 and day 14.

With reference the figure, describe the changes in the levels of estrogen and progesterone between day 5 and day 14.

Oestrogen level increases gradually from day 5 to day 11, increases sharply from day 11 to day 13 to a maximum and decreases from day 13 to day 14. [1]

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Progesterone level remains constantly low from day 5 to day 11 and increases gradually from day 11 to day 14. [1]

Open Ended

State what happens to hormone progesterone if implantation occurs?

State what happens to hormone progesterone if implantation occurs?

Progesterone level would remain high to maintain the uterine lining.

Open Ended

Outline the early development of a fertilized egg.

Outline the early development of a fertilized egg.

The fertilized egg which is a zygote moves toward the uterus and multiplies into a ball of cells forming the embryo. The embryo would then be embedded into the uterine lining.