Tag: botany

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Questions Related to botany

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'.

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

Fertilization is depicted by which of the following condition? 

  1. n $\rightarrow$ 2n
  2. 2n $\rightarrow$ 3n
  3. 2n $\rightarrow$ 4n
  4. 4n $\rightarrow$ 8n
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fertilization is the process of fusion of male and female gametes. Gametes are haploid (n) in nature and the fusion of the two results in the diploid (2n) product called as zygote. Zygote is the universal diploid cell. 

Thus, the correct answer is option A.

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

Oogamous sexual reproduction involves fusion of

  1. Motile and non-motile gametes

  2. Similar gametes

  3. Dissimilar motile gametes

  4. Dissimilar non-motile gametes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Oogamous reproduction involves fusion of one motile male gamete and another non-motile large sized female gametes. 

Fusion of similar gametes is known as isogamous reproduction. Fusion of dissimilar motile or non-motile gametes is known as anisogamous reproduction.
So, the correct option is 'Motile and non-motile gametes'.

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

In oogamy, fertilization occurs between

  1. Small non-motile female gamete and large motile male gamete.

  2. Large non-motile female gamete and small motile male gamete.

  3. A large non-motile female gamete and a small non-motile male gamete.

  4. A large motile female gamete and a small non-motile male gamete.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oogamy is a form of sexual reproduction. It is a form of anisogamy (heterogamy) in which the female gamete is significantly larger than the male gamete and is non-motile.The male gametes are  smaller in size and motile 
So, the correct option is 'Large non-motile female gamete and small motile male gamete'.

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

Fusion of a male gamete with egg in embryo sac is

  1. Autogamy

  2. Syngamy

  3. Double fertilization

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

Syngamy and triple fusion are two events of sexual reproduction in plants. Syngamy is the fusion of one of the male gamete with the egg cell to produce a zygote while In triple fusion, second male gamete fuses with two polar nuclei to produce primary endosperm nucleus.

Since two types of fusions, syngamy and triple fusion take place in an embryo sac the phenomenon is termed double Fertilisation.
So, the correct answer is 'Syngamy'.