The movement of pollen grains from anther to stigma of the same flower is called:
A. Hydrophily
B. Cross-pollination
C. Anemophily
D. Self-pollination
Answer: Option D
Solution (By JKSSB Mock Tests)
Self-pollination (autogamy) occurs within the same flower or between flowers of the same plant. Cross-pollination (allogamy) involves different plants. Hydrophily is pollination by water, anemophily by wind. Self-pollination ensures genetic uniformity, while cross-pollination promotes variation. Cleistogamous flowers (e.g., groundnut) are obligate self-pollinators.
Explanation:
In prokaryotes, DNA polymerase I has 5'→3' exonuclease activity that removes RNA primers and fills the gaps with DNA. DNA pol III extends strands, ligase joins, primase synthesizes primer.
Explanation:
Reverse transcriptase is an enzyme unique to retroviruses that transcribes single-stranded RNA into double-stranded DNA (cDNA). This DNA integrates into the host genome. DNA polymerase synthesizes DNA from DNA, RNA polymerase from DNA. Reverse transcriptase is used in RT-PCR and cDNA synthesis.
Explanation:
Producers (green plants, algae, cyanobacteria) form the first trophic level, converting solar energy into biomass. Consumers depend on them.
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