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

Related Mcqs:

1. In submerged hydrophytes entry of CO2 is through:

   A. Epidermis as dissolved CO2
   B. Epidermis as carbonates only
   C. Epidermis as carbonates only
   D. Both (b) and (c)

2. Submerged hydrophytes have well developed:

   A. Vascular system
   B. Aerenchyma
   C. Root system
   D. Stoma

3. Mark the rooted submerged hydrophyte:

   A. Potamogeton
   B. Najas
   C. Ranunculus
   D. None of these

4. Which of the following is a submerged floating hydrophyte?

   A. Tpha
   B. Trapa
   C. Potamogeton
   D. Ceratophyllum

5. Mark the rooted submerged hydrophyte:

   A. Marsilea
   B. Utricularia
   C. Vallisneria
   D. Monochoria

6. In submerged hydrophytes, which of the following is present?

   A. Air spaces
   B. Cuticle
   C. Well developed sclerenchyma
   D. Well developed vascular tissues

7. In submerged hydrophytes, functional stomata are found:

   A. On upper surface of the leaf
   B. Lower surface of the leaf
   C. Both the surfaces of the leaf
   D. Nowhere on the plant

8. Soft and heart wood are include:

   A. Which are derived from gymnosperms such as pines, evergreen, needle like leaves seeds in cones
   B. Hardwoods are those derived from angiosperms such as oak, ash, popular, with broad leaves seed enclosed bearing flowers
   C. Wood responsible for sap conduction is termed as sap wood
   D. As the wood increases in diameter, cells to the inside are block. This portion of wood is known as heart wood
   E. All of the above

9. 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%

10. Water available to plant is:

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