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.
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.
How is the entry of only one sperm and not many ensured into an ovum during fertilisation in humans?
Given reasons for the following:
(a) The human testes are located outside the abdominal cavity.
(b) Some organisms like honey-bees are called parthenogenetic animals.
(a) Where do the signals for parturition originate from in humans?
(b) Why is it important to feed the newborn babies on colostrums?Write the name of the following:
(a) The most common species of bees suitable for apiculture
(b) An improved breed of chicken