Tag: fertilization in organisms

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Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Fertilization can be correctly defined as fusion of

  1. Male and female pronuclei.

  2. Cytoplasm of male and female gametes.

  3. Two gametes.

  4. Male and female gametes of the same species.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sexual reproduction is a characteristic of animals, although many animals reproduce sexually as well asexually. Reproduction is essential to the survival of any species. Most animals are involved in some variety of sexual reproduction. The methods vary greatly from the simultaneous release of sperm and eggs into the water for many marine organisms, to fertilization inside the body for most terrestrial organisms and high degrees of parental care in birds and mammals.

Fertilization is defined as a process of fusion of male and female gametes. The gametes are special haploid cells. The most widely accepted definition of species is the biological species- according to which members of same species alone can carry on the process of sexual reproduction (including fertilization) and produce fertile offspring.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Type of fertilization (external or internal) depends on

  1. Structure of egg

  2. Site of embryo development

  3. Type of sperm

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aquatic animals like fishes and amphibia usually show external fertilisation, whereas terrestrial animals like reptiles, birds and mammals show internal fertilisation. Egg of animal showing external fertilization is not covered by a hard, protective shell and after fertilisation the embryo develops into larva in water. 

In terrestrial birds and reptiles the egg is covered with a hard, protective shell and development of embryo occurs inside egg. In mammals the egg is not covered by protective shell and fertilization is internal. After fertilization the zygote forms within the body of female animal and stays there till the formation of embryo.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

If cowper's gland is removed, which of the following will be affected?

  1. Sexual attraction

  2. Fertilization

  3. Hardness of penis

  4. Copulation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In human males the urethra, a tube that exits through the penis, carries urine to the exterior and, alternatively, serves as a conduit for seminal fluid. Sperm is carried in a fluid formed along the male reproductive tract by the seminal vesicles, prostate gland, and cowper's glands, accessory glands of the male reproductive tract. Thus, if cowper's glands are removed process of fertilization will be affected.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Purpose of tubectomy is to prevent

  1. Fertilization

  2. Coitus

  3. Egg formation

  4. Embryonic development
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Tubectomy is a surgical procedure for sterilization in which a woman's fallopian tubes are clamped and blocked, or severed and sealed, which prevents eggs from reaching the uterus for implantation, thereby no fertilization can takes place. It is considered the permanent method of birth control. 

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Arrange the following steps in proper order


a) Formation of zygote
b) Formation of embryo
c) Fusion of male and female gamete
d) Implantation of embryo into uterus

  1. a $\rightarrow$ c $\rightarrow$ d $\rightarrow$ a
  2. a $\rightarrow$ b $\rightarrow$ c $\rightarrow$ d
  3. c $\rightarrow$ a $\rightarrow$ b $\rightarrow$ d
  4. d $\rightarrow$ c $\rightarrow$ b $\rightarrow$ a
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

1)fertilization starts with fusion of male gamete (sperm) and female gamete (zygote). 
2) this fusion results in the formation of zygote. 
3) Zygote divided repeatedly to give rise ball of cells that forms embryo.
4) after the formation of embryo is gets embedded in the wall of uterus where it further forms the foetus so the correct order is in above steps.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

In chlorophyceae, sexual reproduction occurs by

  1. Isogamy and anisogamy

  2. Isogamy, anisogamy and oogamy

  3. Oogamy only

  4. Anisogamy and oogamy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chlorophyceae is a class of algae that is also known as green algae commonly. Different members of this class reproduce differently.

They reproduce by fusion of similar gametes ( isogamy ), the fusion of dissimilar gametes ( anisogamy ) as well as the fusion between a small non-motile and a large non-motile gamete (Oogamy).
So, the correct answer is 'Isogamy, anisogamy, and oogamy'.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

The phenomenon of fertilization was first perceived by 

  1. Weismann

  2. Leeuwenhoek

  3. Robert Hooke

  4. Hertwig
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The phenomenon of fertilization was first perceived by the German biologist Oscar Hertwig in sea urchin eggs in 1876. Hertwig observed that the sperm nuclei and egg fused during fertilization resulting in the generation of new organism. Thus the correct answer is option D.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

The common mode of sexual reproduction in Chlamydomonas is

  1. Isogamous

  2. Anisogamous

  3. Oogamous

  4. Hologamous
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chlamydomonas reproduces both asexually and sexually. 

Asexual reproduction takes place by zoospores while sexual reproduction can be isogamous, anisogamous or oogamous. 
Though, commonly fusion takes place between similar gametes hence reproduction takes place by isogamy.
So, the correct option is 'Isogamous'.