Name of parasite the causes filariasis in humans. Mention its two diagnostic symptoms. How is this transmitted to others?
Filaria is caused by Wuchereria bancrofti and Wuchereria malayi.
Diagnostic symptoms:
The disease majorly affects the lymphatic system of the lower limbs that causes inflammation of the organs. The genital organs are also affected, resulting in gross deformities.
Transmission: The pathogens are transmitted to a healthy person through the bite by the female mosquito vectors.
Some organisms suspend their metabolic activities to survive in unfavourable conditions. Explain with the help of any four examples.
(a) State the role of DNA ligase in biotechnology.
(b) What happens when Meloidegyne incognitia consumes cells with RNAi gene?Draw a schematic diagram of a part of double stranded dinucleotide DNA chain having all the four nitrogenous bases and showing the correct polarity.
How do mycorrhizae act as biofertilizers? Explain. Name a genus of fungi that forms a mycorrhizal association with plants.
(a) State the difference between meiocyte and gamete with respect to chromosome number.
(b) Why is a whiptail lizard referred to as parthenogenetic?Explain the work carried out by Cohen and Boyer that contributed immensely in biotechnology.
Where is sporopollenin present in plants? State its significance with reference to its chemical nature.
