7B Sexual reproduction in animals

Question 1

Name this type of cell.

Answer 1

Sperm Cell

Question 2

Name this type of cell.

Answer 2

Egg cell

Question 3

Where are egg cells produced?

Answer 3

Ovaries

Question 4

Where are sperm cells produced?

Answer 4

Testis / Testicles

Question 5

Describe and explain 3 adaptations of a sperm cell.

Answer 5

• Tail for swimming
• Streamlined - less energy is expended when swimming
• Little cytoplasm - allows it to be light and small
• Mitochondria - to produce energy for swimming

Question 6

Describe and explain 2 adaptations of an egg cell.

Answer 6

• Large - easier for cilia to move egg along the oviduct.
• Large - bigger target for sperm cell
• Large - contains a food store

Question 7

What process is shown in this picture?

Answer 7

Fertilisation

Question 8

What is implantation?

Answer 8

The embryo implants / sticks to the wall of the uterus.

Question 9

What is the name and role of part A?

Answer 9

Testes / Testicles - produce sperm

Question 10

What is the name and the role of part B?

Answer 10

Sperm Duct - Carry the sperm from the testes to the penis.

Question 11

What is the name and role of part D?

Answer 11

Urethra - Carries urine and sperm out of the body.

Question 12

What is the name and role of part 1?

Answer 12

The vagina is a muscular tube that leads from the cervix to the outside of the woman’s body

Question 13

What is the name and role of part 2?

Answer 13

The cervix is a ring of muscle at the lower end of the uterus. It keeps the baby in place while the woman is pregnant.

Question 14

What is the name and role of part 4?

Answer 14

Uterus - The uterus, also called the womb, is a muscular bag with a soft lining. The uterus is where a baby develops until its birth.

Question 15

What is the name and the role of part 7?

Answer 15

Ovary - the two ovaries (one of them is called an ovary) contain hundreds of undeveloped female gametes (sex cells).

Question 16

What is the name and the role of part 5?

Answer 16

Oviduct - tube through which an egg travels from the ovary to the uterus.

Question 17

Name 3 changes that happen to boys when they go through puberty.

Answer 17

• Voice breaks / changes
• Grow facial hair
• Grow pubic hair
• Penis and testes grow
• Body odour
• Grow taller

Question 18

Name 3 changes that happen to girls when they go through puberty.

Answer 18

• Grow breasts
• Grow pubic hair
• Start periods
• Grow taller

Question 19

Name one substance that passes through the placenta to a developing baby.

Answer 19

• Food
• Nutrients
• Water
• Oxygen

Question 20

What happens during menstruation?

Answer 20

Blood and uterus lining breaks down and flows out of the vagina.

Question 21

What happens during ovulation?

Answer 21

An egg is released from an ovary.

Question 22

How long does the menstrual cycle usually last?

Answer 22

28 days

Question 23

At which day of the menstrual cycle does ovulation occur?

Answer 23

Day 14

Question 24

Why do animals that reprocuce by external fertilisation produce large numbers of eggs?

Answer 24

• Many may be eaten.
• To increase the chance of fertilisation.

Question 25

What is the name of this type of cell? What is their role?

Answer 25

• Ciliated cell
• Sweep the egg down the oviduct towards the uterus.