Mix Examples-Sexual Reproduction in Flowering Plants Questions in English

(B) The correct answer is $B$.
Continued self-pollination leads to the accumulation of recessive deleterious alleles in the population.
This process reduces the genetic diversity and results in a decrease in the biological fitness, vitality, and productivity of the offspring, a phenomenon known as $inbreeding \text{ } depression$.

(B) In castor and maize plants,both male and female flowers are present on the same plant (monoecious condition).
Since the flowers are unisexual,self-pollination within the same flower (autogamy) is prevented.
However,pollen grains can be transferred from the anther of one flower to the stigma of another flower on the same plant,which is known as geitonogamy.
Therefore,autogamy is prevented but geitonogamy is not.

(A) . Cleistogamy: It is a condition where flowers do not open,leading to bud pollination $(n)$.
$B$. Geitonogamy: It is the transfer of pollen grains from the anther to the stigma of another flower of the same plant $(o)$.
$C$. Entomophily: It is the process of pollination by insects $(m)$.
$D$. Xenogamy: It is the transfer of pollen grains from the anther to the stigma of a different plant,which is a type of cross-pollination $(q)$.
Therefore,the correct matching is $A-n, B-o, C-m, D-q$.

(A) In male honeybees (drones),the cells are already haploid $(n)$.
Since they cannot undergo meiosis to produce gametes (as meiosis requires a diploid set of chromosomes for pairing),they produce gametes by mitosis.
Therefore,male honeybees produce sperm through mitotic division.