Which is a better mode of reproduction, sexual or asexual? Why? - Science and Technology 2

Answer in Brief

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



  1. Sexual reproduction is a better mode of reproduction. It allows the formation of new variants by the combination of the DNA from two different individuals, typically one of each sex.
  2. It involves the fusion of the male and the female gamete to produce variants, which are not identical to their parents and to themselves.
  3. This variation allows the individual to adapt to constantly changing and challenging environments. Also, it leads to the evolution of better-suited organisms which ensures greater survival of a species.
  4. On the contrary, asexual reproduction allows very little or no variation at all. As a result, the individuals produced are exact copies of their parents and themselves.
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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

List six specific characteristics of sexual reproduction.

What are chromosomes?

No two individuals are absolutely alike in a population. Why?

Describe the process of fertilization in human beings.

Choose the most appropriate answer.

The number of nuclei present in a zygote is

Indicate whether the following statements are True (T) or False (F).

Oviparous animals give birth to young ones. ( )

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).

A zygote is formed as a result of fertilization. ( )

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.

Fill in the following blank with suitable word :

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

State the advantages of sexual reproduction over asexual reproduction.

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

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

Distinguish between the following pair of terms:

Budding and Regeneration.

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

Define the term Adolescence.

Mention the common method of reproduction in Hydra.

Mention the common method of reproduction in Flatworm.

Mention the common method of reproduction in Start fish.

Mention the changes which occur during adolescence in humans.

Adolesecence is considered a critical stage in the life of boys and girls. Explain this statement.

Name the two types of mammalian gametes. How are these different from each other? Name the type of reproduction they are involved in. Write the advantage of this type of reproduction. 

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

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

Answer in one sentence.

Which glands contribute fluids to the semen?

Answer in one sentence.

Enlist the external genital organs in the female.

Explain the histological structure of testis.

Answer the following question.

Explain the histological structure of ovary in human.

Answer the following question.

Explain the following parts of male reproductive system along with labelled diagram showing these parts- Testis, vasa deferentia, epididymis, seminal vesicle, prostate gland and penis.

Long answer question.

Describe female reproductive system of human.

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.

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 is external fertilisation?

What are oviparous animals?

Explain the two types of fertilization.

Explain the formation of the embryo.


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