The events shown in the diagram (in sequential order) are:

  • A
    Fission of gametes $\rightarrow$ new individual $\rightarrow$ zygote
  • B
    Fusion of gametes $\rightarrow$ zygote $\rightarrow$ new individual (cell $2n$)
  • C
    Fission of gametes $\rightarrow$ zygote $\rightarrow$ new individual (cell $2n$)
  • D
    Stages in gametogenesis

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In multicellular organisms, life begins with a .......... .

Rearrange the following events of sexual reproduction in the sequence in which they occur in a flowering plant: embryogenesis, fertilisation, gametogenesis, pollination.

Choose the correct options for the following statements:
$1$. Autogamy is genetically xenogamy.
$2$. Pollination occurs by air in grass.
$3$. Placenta is arranged in the inner wall of the ovary.
$4$. It is possible to store pollen grains in liquid nitrogen at $-196^oC$.

Give a scientific reason: Variations are expected in sexually reproducing plants.

Rose plants produce large,attractive bisexual flowers but they seldom produce fruits. On the other hand,a tomato plant produces plenty of fruits though it has small flowers. Analyse the reasons for the failure of fruit formation in roses.

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