F4 BIOLOGY 15.5 15.6

Hello students!

Welcome back to our class today.

Happy 1st November!

Today, we will learn about subtopic 15.5 & 15.6

Poll

15 days away from your PAT, are you guys ready for it?

• Yes! 

• Slowly but surely

• Totally not in the mood

Multiple Choice

Where do the egg and sperm meet?

• ovary

• fallopian tube

• uterus

• vas deferens

Multiple Choice

The developing embryo is fed by its mother’s blood through a tissue called the

• placenta

• vagina

• amnion

• uterus

Multiple Choice

Which of the following are functions of the placenta?

I. Gas exchange

II. Stimulation of uterine contractions

III. Secretion of progesterone

IV. Secretion of estrogens

• I only

• III and IV only

• I, III and IV only

• I, II, III and IV

Multiple Choice

The human female reproductive system is represented below. Within which structure does the placenta normally develop?

• A

• B

• C

• D

Multiple Choice

State the number of chromosomes in a human zygote.

• 23

• 46

• 29

• 12

Multiple Choice

Identical twins share one placenta.

• True

• False

Multiple Choice

Fraternal twins are developed from one ovum and one sperm.

• True

• False

Multiple Choice

In the formation of identical twins, the zygote divides completely.

• True

• False

Multiple Choice

Identical twins can be of the same sex or different sex while fraternal twins are of the same sex.

• True

• False

Multiple Choice

Conjoined twins are formed when the zygote doesn't divide completely.

• True

• False

Multiple Choice

Siamese twins are also known as

• Identical twins

• Conjoined twins

• Fraternal twins

Multiple Choice

__________ are physically joined together.

• Identical twins

• Conjoined twins

• Fraternal twins

• Non-identical twins

Multiple Choice

The diagram below represents some stages of early embryonic development. Which process is represented by the arrows in the diagram?

• meiosis

• mitosis

• fertilization

• evolution

Multiple Choice

If an egg that has been fertilized by a sperm splits into two while it is in the fallopian tube, the beginning of two babies can start to grow. These are known as

• Identical twin

• Fraternal twin

• Triplets

Multiple Choice

The above image is

• Identical twin

• Fraternal twin

• Triplets

• Siamese twin

Multiple Choice

Each foetus has their own placenta and umbilical cords.

• Identical twin

• Fraternal twin

Thats all for our class today. Only one subtopic left in chapter 15. You guys did well! :)

Stay focus and do spend time for revision.

Believe me, your hard work will be worth it! :D

Open Ended

Do you guys want to have a revision class after school hour? If yes, please state the chapter that you want me to focus on. Or else, if the answer is no then just state NO. I will take the answer based from majority. TQ <3