A pollen grain in angiosperm at the time of dehiscence from an anther could be 2-celled or 3-celled. Explain. How are the cells placed within the pollen grain when shed at a 2-celled stage ?
In majority angiosperms, pollens are released in 2-celled stage whereas in other species, the generative cell divides into 2 male gametes & forms 3-celled stage. When the pollen grain is shed at 2-celled stage - it has two unequal cells - bigger vegetative cell and smaller generative cell.
Name the type of cross that would help to find the genotype of a pea plant bearing violet flowers.
Mention one application for each of the following : (a) Passive immunization (b) Antihistamine (c) Colostrum (d) Cytokinin-barrier
A herd of cattle is showing reduced fertility and productivity. Provide one reason and one suggestion to overcome this problem.
Differentiate between the genetic codes given below : (a) Unambiguous and Universal (b) Degenerate and Initiator
An electrostatic precipitator in a thermal power plant is not able to generate high voltage of several thousands. Write the ecological implication because of it.
Name the microbes that help production of the following products commercially : (a) Statin (b) Citric acid (c) Penicillin (d) Butyric acid