Reduction of mechanical and vascular tissue and poor roots are found in:

Related Mcqs:

1. Mechanical tissues and xylem are highly reduced in Hydrilla because:

   A. Water provides the support and there is no problem for the absorption and conduction of water
   B. Otherwise the weight of these tissues would drown the plant
   C. Of the anaerobic conditions created by submergence
   D. Otherwise translocation of food would have been interrupted

2. Relative to shoots, the roots can be very massive in plants of:

   A. Deserts
   B. Lakes and ponds
   C. Mixed temperate forests
   D. Mixed tropical forests

3. The zone of soil showing microbial activity around the roots of higher plants is called:

   A. Rhizosphere
   B. Rhizoplane
   C. Soil microflora
   D. All of these

4. The association of nodule bacteria with leguminous roots is known as:

   A. Saprophytism
   B. Symbiosis
   C. Epiphytism
   D. Parasitism

5. Mucilagenous tissue and chlorenchymatous cortex are characteristic of:

   A. Epiphytes
   B. Insectivorous plants
   C. Halophytes
   D. Mesophytes

6. Mechanical scarification is:

   A. The purpose of mechanical scarification is to modify hard
   B. Or impervious seed coats
   C. Both (a) & (b)
   D. None of these

7. Mechanical thinning is:

   A. The trees to be cut or retained are chosen on the basis of a predetermined spacing
   B. Or pattern with little or no regard for their position in the crown canopy
   C. Both (a) & (b)
   D. None of these

8. A symbiotic association between fungus and roots of higher plants is known as:

   A. Lichen
   B. Mycorrhiza
   C. Mutualism
   D. None of these

9. The mycorrhizae present in association with higher plant roots are best described as:

   A. Keystone species
   B. Edge species
   C. Critical link species
   D. Edaphic pod species

10. Cryopreservation of tissue is done at the following temperature:

    A. -196
    B. 126
    C. 206
    D. -96
    E. None of these