Answer:
The four difference between chemical fertilizers and organic fertilizers are following :•
- chemical fertilizers prepared in industries whereas organic fertilizers prepared in field
- chemical fertilizer does not provide humus to the soil whereas organic fertilizers provide humus to the soil
- in chemical fertilizer , these are chemical that are added to the soil to increase its fertility and productivity. whereas in organic fertilizers, These are obtained from dead and decaying plants and animals.
- Rich in plant nutrients whereas Less rich in plant nutrients
Answer:
D. Sterility Locus
Explanation:
Angiosperms have several mechanisms to prevent self-pollination due to the advantage of cross-pollination. One of such mechanisms is self-incompatibility genes present on the sterility locus.
These genes determine the germination of the pollen on the stigma. If both the pollen and stigma carry the same allele of the gene present at the sterility locus, the germination of pollen is prevented.
The sterility locus has multiple alleles and the presence of the same alleles at the same locus in both pollen and stigma prevents the pollen germination.
For example, pollen from S1S2 individuals can not germinate on the stigma with the S1S3 genotype. Here, the pollen does not obtain water as required for germination from the stigma and are unable to germinate.
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