The chemical produced by the host plant to protect themselves against fungal infection is:

Related Mcqs:

1. The major tool in the hands of the Forest Departments to protect forest areas is the Forest Act of 1927. Its salient features are:

   A. Government is the supreme owner of forestland
   B. Forests have been classed as reserved forests, protected forests, unclassed forests and community forests (Guzara forests), according to the need of protection
   C. Both (a) & (b)
   D. None of these

2. The relationship between a climber and the host corresponds to:

   A. Neutralism
   B. Mutualism
   C. Parasitism
   D. Commensalism

3. By chemical composition the humus has maximum percentage of:

   A. Nitrogen
   B. Oxygen
   C. Carbon
   D. Hydrogen

4. The processes involved in the chemical weathering are:

   A. Carbonation and oxidation
   B. Hydrolysis and chelation
   C. Hydrolysis and reduction
   D. All of these

5. Those chemicals which are produced by plants and affect other plants are broadly called:

   A. Depresants
   B. Allomones
   C. Allelochemics
   D. Kairomones

6. When a plant first begins to wilts permanently in a pot, its 54.5 gms of soil has 4.5 gms of water. The PWP of this soil is:

   A. 4.50%
   B. 9%
   C. 8.25%
   D. 16.50%

7. Plant groups growing in zones where high temperature alternates with low temperature are called:

   A. Megatherms
   B. Hekistotherms
   C. Microtherms
   D. Mesotherms

8. Relationship between nitrogen fixing bacteria and a legume plant is described as:

   A. Mutualistic
   B. Parasitic
   C. Saprophytic
   D. Commensal

9. The stems of submerged water plant are soft and weak because:

   A. They are absolutely devoid of xylem
   B. They totally lack phloem
   C. They do not have stomata
   D. The supporting tissues and xylem are feebly developed

10. Water available to plant is:

    A. Run off water
    B. Gravitational water
    C. Hygroscopic water
    D. Capillary water