Tamil Nadu Board of Secondary EducationSSLC (English Medium) (5 to 8) Class 5

What is external fertilisation? - Science

Advertisements
Advertisements
Answer in Brief

What is external fertilisation?

Advertisements

Solution

  1. External fertilization takes place outside the animal’s body.
  2. It usually takes place in aquatic environments where both eggs and sperm are released into the water.
  3. Fertilization in frogs and fish takes place by this method.
  Is there an error in this question or solution?

RELATED QUESTIONS

Which mode of reproduction gives rise to variation?


Give the importance of variation in survival of species.


Complete the following table to get the differences between asexual and sexual reproduction:

Characteristics Asexual Reproduction Sexual Reproduction
Number of parents involved ........................... ..............................
Type of cells involved Somatic cells Germ cells
Type of cell division ............................ Meiosis and mitosis

What is meant by sexual reproduction?


Name two main processes of sexual reproduction


What are chromosomes?


What is amphimixis?


Describe the process of fertilization in human beings.


Choose the most appropriate answer.

Internal fertilization occurs


Choose the most appropriate answer.

The number of nuclei present in a zygote is


Indicate whether the following statement is True (T) or False (F).

Each sperm is a single cell. ( )


Indicate whether the following statement is True (T) or False (F).
A new human individual develops from a cell called gamete. ( )


Indicate whether the following statement is True (T) or False (F).
An embryo is made up of a single cell. ( )


Give two differences between a zygote and a foetus.


In which female reproductive organ does the embryo get embedded?


Differentiate between internal fertilization and external fertilization.


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.


Name two animals which reproduce sexually.


Fill in the following blank with suitable word :

A multicellular animal starts its life from a ........... through sexual reproduction.


In which sort of reproduction are gametes involved?


Describe the various steps involved in the sexual reproduction in animals. Draw labelled diagrams to show the fertilisation of an ovum (or egg) by a sperm to form a zygote


 Name two plants which reproduce by sexual reproduction method and two plants which reproduce by asexual reproduction methods.


The advantage that internal fertilisation has over external fertilisation is that in internal fertilisation :
(a) new off-springs are exactly like the parent
(b) production of large numbers of gametes is unnecessary
(c) copulation and fusion of gametes is passive
(d) fewer individuals are produced


Characters that are transmitted from parents to offspring during sexual reproduction show :
(a) only similarities with parents
(b) only variations with parents
(c) both similarities and variations with parents
(d) neither similarities nor variations with parents


The number of chromosomes in parents and offsprings of a particular species remains constant due to :
(a) doubling of chromosomes after zygote formation
(b) halving of chromosomes during gamete formation
(c) doubling of chromosomes after gamete formation
(d) halving of chromosomes after gamete formation


Put a tick mark (✓) against the correct alternative in the following statement:

Which one of the following represents the correct sequence in the life history of a butterfly ?

  1. Egg → Larva → Adult → Pupa
  2. Egg → Pupa → Adult → Larva
  3. Egg → Larva → Pupa → Adult
  4. Egg → Pupa → Larva → Adult

Define the term  Implantation.


What is the function of uterus?


Multiple choice question. Tick (✓) the correct choice:

Butterfly in its development from larva to an adult shows

  1. multiplication
  2. metamorphosis
  3. fertilisation
  4. none of the above

Differentiate between the following:

Sperm and Ovum


Define the term Puberty.


Mention the common method of reproduction in Hydra.


Name the organ involved in the following:

Passing of sperms from a man to a woman.


Mention the changes which occur during adolescence in humans.


Describe the various stages in the life cycle of a butterfly.


Sketch and label the diagram showing self- and cross-pollination.


In the sexual mode of reproduction, greater diversities are generated.


Answer in one sentence.

Outline the path of sperm upto the urethra.


Answer in one sentence.

Which glands contribute fluids to the semen?


Answer in one sentence.

Name the endocrine glands involved in maintaining the sex characteristics of males.


Answer the following question.

Explain the histological structure of ovary in human.


What is atresia with respect to ovary in human females?


Give an account of external genitalia in human females.


Describe the histology of testis with help of labelled diagram.


Identify the labels from the given diagram.


Write an account of the seminal vesicle and bulbourethral gland in the male reproductive system.


Which are the components of pollination?


Animals which give birth to young ones directly are named as ______.


What are the different stages of sexual reproduction?


Which organs/glands produce eggs and sperms?


In an ovule, meiosis occurs in ______


Due to presence of which of the following chemical component, pollen grains can remain well preserved in fossil?


Testosterone is produced by ____________.


Which of the following is the male accessory gland?


Identify the INCORRECT statement.


Match column -1 with column - II and select the correct option.

  Column - I   Column - II
1. Seminal vesicles a. Membranous urethra
2. Scrotum b. Thermoregulatory
3. Tunica vaginalis c. Fibro muscular pouches
4. Cowper's gland d. Peritoneal covering

______ is the first stage of sexual reproduction.


______ fertilisation takes place in frogs and fish.


Animals in which an embryo develops outside the body are called ______ animals.


______ lay thousands and sometimes millions of small, soft eggs in water.


Name the two ways by which fertilisation in animals takes place.


What are oviparous animals?


Explain the two types of fertilization.


Explain the formation of the embryo.


Which is a better mode of reproduction, sexual or asexual? Why?


Share
Notifications



      Forgot password?
Use app×