Fertilisation

Q.

Question 10
Complete the crossword puzzle using the hints given below.
Across
1. The process of the fusion of the gametes.
6. The type of fertilization in hen.
7. The term used for bulges observed on the sides of the body of Hydra.
8. Eggs are produced here.
Down
2. Sperms are produced in these male reproductive organs.
3. Another term for the fertilized egg.
4. These animals lay eggs.
5. A type of fission in amoeba.

Q.

In which of the following techniques the embryos are transferred to assist those females who cannot conceive:

1. ICSI & ZIFT

2. GIFT & ICSI

3. ZIFT & IUT

4. GIFT & ZIFT

Q.

Explain how chicks are born. How much time does the embryo present in hens egg take to develop into a chick (when provided sufficient warmth)?

Q. Define fertilisation. What are the two types of fertilisation?

Q.

Name two animals which undergo metamorphosis and which do not.

Q.

What is the ploidy of the archegonia and the antheridia?

Q.

What is meant by the terms 'internal fertilisation' and 'external fertilisation' ? Explain with examples.

Q.

Explain in detail: Internal fertilization takes place in both humans and hens but human beings give birth to babies while hens lay eggs.

Q.

A tadpole develops into an adult frog by the process of:

1. fertilization

2. metamorphosis

3. embedding

4. budding

Q.

Name the process of the fusion of gametes.

Q.

Define foetus.

Q.

Give two differences between a zygote, an embryo and a foetus.

Q.

How is zygote formed?

Q. Why do fish and frogs lay eggs and release sperm in hundreds whereas a hen lays only one egg at a time?

1. One sperm can fertilise many eggs
2. Only one of the fertilised egg can become an adult
3. To ensure fertilisation of at least few of them
4. Many sperms can fertilise one egg

Q.

How many nuclei are present in a zygote?

Q.

Animals exhibiting external fertilisation produce a large number of gametes. Pick the appropriate reason from the following.

1. The animals are small in size and want to produce more offspring.

2. Food is available in plenty of water.

3. To ensure a better chance of fertilisation.

4. Water promotes the production of a large number of gametes.

Q.

Question 04(v)
Indicate whether the following statements are True (T) or False (F).
Egg laid after fertilization is made up of a single cell. ( )

Q. What happens to the other millions of sperms when one sperm dues with the ova

Q.

(a) Explain the term 'fertilisation'. Describe the process of fertilisation in human beings.

(b) Draw a labelled diagram to show the fertilisation of a human egg by a sperm to form a zygote.

Q. Zygote produced in a flower develops into

1. seed
2. stem
3. embryo
4. root

Q.

(a) What are gametes?

(b) In which sort of reproduction are gametes involved?

(c) What is formed when two gametes fuse?

(d) What is this act of fusion called?

Q. Male and female gametes fuse to form ___.

1. sperm
2. ovary
3. zygote
4. ovum

Q.

What type of fertilisation takes place in hen?

Q.

Differentiate between internal fertilisation and external fertilisation. What type of fertilisation takes place in (a) frog, and (b) fox?

Q.

The number of nuclei present in a zygote is:

A. None

B. One

C. Two

D. Four

Q.

X and Y are the two types of animals. The animals like X undergo external fertilisation whereas animals like Y undergo internal fertilisation. The animals like X lay eggs from which baby animals are hatched. On the other hand, in animals like Y, the young one develops inside the uterus of mother which then gives birth to the baby.

(a) What is the general name of animals like X ?

(b) Give two examples of animals like X.

(c) What is the general name of animals like Y ?

(d) Write the names of two animals like Y.

Q. The acidic environment of the vagina in females facilitate the sperms to reach the egg.

1. True
2. False

Q. Identify the correct set of animals exhibiting internal fertilisation.

1. Cow, hen, dogs
2. Frog, hen, cow
3. Starfish, frog, dog
4. Hen, human, dog

Q.

Fertilisation results immediately in the formation of:

A. a zygote

B. an embryo

C. a placenta

D. a foetus

Q.

The stage of the embryo in which all the body parts can be identified is called a ___.