Page 104 - Science Class 08

i Internal fertilisation occurs in many animals including humans, cattle, dogs, hens, etc.

i External fertilisation is common in many amphibians, fish, star fish, etc.
i In human reproductive system, both male and female parents are involved.
i The embryo gradually develops body parts of an unborn baby and this stage of embryo is
called a fetus.
i In asexual reproduction only a single parent is involved in reproduction.

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Exercise
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A. Tick (3) the correct op on.
1. Which of the following animals reproduces by external fer lisa on?

(a) Fish (b) Camel
(c) Hen (d) Goat
2. Which of the following animal is bisexual?

(a) Cow (b) Amoeba
(c) Earthworm (d) Paramecium
3. Which of the following is not a male sex organ?
(a) Tes s (b) Sperm duct

(c) Oviduct (d) All of these
4. Which of the following is a oviparous animal?
(a) Cow (b) Hen

(c) Cat (d) Goat
5. Which of the following organisms does not reproduce through asexual reproduc on?
(a) Hydra (b) Bacteria
(c) Fish (d) None of these
B. Match the following columns.

Column I Column II
1. Testes a. Fission
2. Fer lisa on b. Iden fica on of body parts of an unborn baby

3. Amoeba c. Sperm
4. Female gamete d. Fallopian tube
5. Fetus e. Ovum
C. Fill in the blanks.

1. In __________________ reproduc on, two parents one male and the other female of the
same species are required.

2. A fer lised egg is called __________________ .
3. External fer lisa on takes place __________________ the body.

104 Science-8