Question

b) what is the difference between lytic cycle and lysogenic cycle. explain in detail by drawing diagram of lytic cycle. think 2; app/6
c) describe the role of the fungal partner in each of the following in maintain symbiotic relationship 1) mycorrhiza 2) lichens comm /6

Explanation:

b) The lytic cycle is a viral reproductive cycle where a virus immediately takes over a host - cell's machinery to produce new viruses, which burst out of the cell (lysis). In the lysogenic cycle, the viral DNA integrates into the host - cell's genome and replicates along with it without immediately causing cell lysis. A diagram of the lytic cycle would show steps like virus attachment to the host cell, injection of viral genetic material, replication of the virus within the cell, assembly of new virus particles, and cell lysis to release the new viruses.
c1) In mycorrhiza, the fungal partner helps the plant absorb water and minerals (especially phosphorus) from the soil more efficiently. The fungus also provides some protection against pathogens. In return, the plant supplies the fungus with carbohydrates produced through photosynthesis.
c2) In lichens, the fungal partner provides a protective structure and anchors the lichen to surfaces. It also helps in absorbing water and nutrients from the environment. The algal or cyanobacterial partner in the lichen performs photosynthesis and provides carbohydrates to the fungal partner.

Answer:

b) The lytic cycle leads to immediate host - cell lysis and virus production, while the lysogenic cycle involves viral DNA integration into the host genome without immediate lysis. A lytic - cycle diagram would show virus attachment, injection, replication, assembly, and lysis.
c1) In mycorrhiza, the fungus aids in nutrient and water absorption and offers some pathogen protection.
c2) In lichens, the fungus provides a protective structure and helps in nutrient and water uptake.