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How do the pollen grains of Vallisneria protect themselves?
Vallisneria being a water pollinated species protect their pollen grains by having a mucilaginous coat. The coat prevents the pollen grains from getting wet.
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Name the respective pattern of inheritance where F1 phenotype
(a) does not resemble either of the two parents and is in between the two.
(b) resembles only one of the two parents.
(a) Incomplete Dominance is the condition in which the F1 phenotype does not resemble both the parents and is in between the two.
(b) Complete Dominance is the condition in which the F1 phenotype resembles the dominant parent i.e one of the two parents.
Write the name of the following:
(a) The most common species of bees suitable for apiculture
(b) An improved breed of chicken
(a) Apis indica is the most common species of bee suitable for apiculture.
(b) Leghorn is an improved breed of chicken.
Mention the role of cyanobacteria as a biofertiliser.
Cyanobacteria such as Anabaena and Nostoc are free-living and help fix atmospheric nitrogen and act as bio-fertilizers especially in paddy fields.
How is the entry of only one sperm and not many ensured into an ovum during fertilisation in humans?
During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and with the help of acrosomal secretions induces changes in the membrane that block the entry of additional sperms. Thus, it ensures that only one sperm can fertilise an ovum
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Mock Test Series
