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Test: Transportation In Plants - 1


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Test: Transportation In Plants - 1 - Question 1

The two kinds of elements present in xylem are:

Detailed Solution for Test: Transportation In Plants - 1 - Question 1
  • The xylem tracheary elements consist of cells known as tracheids and vessel members, both of which are typically narrow, hollow, and elongated.
  • Tracheids are less specialized than the vessel members.
  • Main function of xylem – upwards water transport.
  • The xylem, vessels and tracheids of the roots, stems and leaves are interconnected to form a continuous system of water-conducting channels reaching all parts of the plants.
  • The system transports water and soluble mineral nutrients from the roots throughout the plant.
     
Test: Transportation In Plants - 1 - Question 2

Xylem in plants is responsible for transport of:

Detailed Solution for Test: Transportation In Plants - 1 - Question 2
  • Xylem cells form long tubes that transport materials, and the mixture of water and nutrients that flows through the xylem cells is called xylem sap.
  • These substances are transported through passive transport, so the process doesn’t require energy.
  • The phenomenon that allows xylem sap to flow upwards against gravity is called capillary action. This occurs when surface tension makes liquid move upward.
  • Water is also aided in moving up through the xylem by adhering to the xylem cells. However, it gets harder to work against gravity to transport materials as a plant grows taller, so xylem sets an upper limit on the growth of tall trees.
Test: Transportation In Plants - 1 - Question 3

Living cells placed in isotonic solution (0.9% saline) retain their size and shape. This is based on the concept of

Detailed Solution for Test: Transportation In Plants - 1 - Question 3

Osmosis is the concept that involves in the moment of solutions inside and outside of the cell. If the cell is placed in isotonic solution, the net change will be zero.

Test: Transportation In Plants - 1 - Question 4

Which of the following substances is transported by phloem tissue?

Detailed Solution for Test: Transportation In Plants - 1 - Question 4
  • Plants have two transport systems - xylem and phloem .
  • Xylem transports water and minerals. Phloem transports sugars (sucrose) and amino acids dissolved in water.
Test: Transportation In Plants - 1 - Question 5

The exudation of xylem sap drops on the edges of leaves is called

Detailed Solution for Test: Transportation In Plants - 1 - Question 5
  • Guttation is the exudation of drops of xylem sap on the tips or edges of leaves of some vascular plants, such as grasses, and a number of fungi.
  • Guttation is not to be confused with dew, which condenses from the atmosphere onto the plant surface.
Test: Transportation In Plants - 1 - Question 6

Steroid hormones easily pass through the plasma membrane by simple diffusion because they

Detailed Solution for Test: Transportation In Plants - 1 - Question 6

Steroid hormones are made up of fats and they are not soluble in water. They are hydro phobic in nature. Hence they can easily pass through the plasma membrane by simple diffusion.

Test: Transportation In Plants - 1 - Question 7

Seeds swell when placed in water due to:

Detailed Solution for Test: Transportation In Plants - 1 - Question 7

Raisins when soaked in water swell up due to imbibition. As a result of absorption or imbibition of water, the size of the raisins increases. The difference in mass between the swollen and dry raisins gives the amount of water imbibed by the raisins.

Test: Transportation In Plants - 1 - Question 8

Which component allows the movement of sugar stored in the roots or stem to the newly growing buds in spring?

Detailed Solution for Test: Transportation In Plants - 1 - Question 8

In spring, new buds are formed. These buds need more energy to grow than other parts of the plant. This energy comes from the sugar stored in the root or stem tissue to the buds by phloem. Thus, buds need the sugars in springs. 

Test: Transportation In Plants - 1 - Question 9

In angiosperms, water is conducted through:

Detailed Solution for Test: Transportation In Plants - 1 - Question 9
  • In angiosperms, water is conducted through vessels and tracheids.
  • Xylem is a complex tissue composed of xylem vessels, xylem tracheids, xylem fibers, and xylem parenchyma. 
  • Xylem vessels: Xylem vessels comprise a vertical chain of lengthened, dead cells known as vessel elements.
  • Xylem vessels are long hollow chains of tough long-dead xylem cells.
  • Xylem tissue is the water transporter cells of plants. It carries water around a plant. The presence of vessels is a characteristic feature of flowering plants.
  • Xylem vessels work because of the transpiration stream. It is caused by the evaporation of water from the cells in the leaf to the atmosphere. The resulting surface tension causes pressure in the xylem that pulls the water from the roots and soil. This is called capillary action.

 

  • Tracheids are elongated cells in the xylem of vascular plants that serve in the transport of water and mineral salts. Tracheids are one of two types of tracheary elements, vessel elements being the other. Tracheids, unlike vessel elements, do not have perforation plates.
  • Tracheids provide most of the structural support in softwoods, where they are the major cell type. Because tracheids have a much higher surface to volume ratio compared to vessel elements, they serve to hold water against gravity (by adhesion) when transpiration is not occurring. This is likely one mechanism that helps plants prevent air embolisms.
Test: Transportation In Plants - 1 - Question 10

The rate of transpiration increases by an increase in the:​

Detailed Solution for Test: Transportation In Plants - 1 - Question 10

Transpiration is physiological evaporation of water . It is same as evaporation of water from living system. More the temperature more will be evaporation. Hence, transpiration will be more at high temperature.

Test: Transportation In Plants - 1 - Question 11

Root pressure is highest when:

Detailed Solution for Test: Transportation In Plants - 1 - Question 11
  • Root pressure, in plants, force that helps to drive fluids upward into the water-conducting vessels (xylem). It is primarily generated by osmotic pressure in the cells of the roots and can be demonstrated by exudation of fluid when the stem is cut off just above ground. It is partially responsible for the rise of water in plants.
  • Root pressure is the positive pressure that develops in the roots of the plants by active absorption of nutrients from the soil. The active absorption depends on the active accumulation of solute in xylem sap.
  • Root pressure in maximum when transpiration is very low and absorption is high because transpiration is the output of water from a plant, and absorption is the input of water into a plant. If the output is low and input is high, the pressure will be at its greatest.
Test: Transportation In Plants - 1 - Question 12

The stomata open when the guard cells are:

Detailed Solution for Test: Transportation In Plants - 1 - Question 12

The opening and closing of the stomata is controlled by the guard cells. In light, guard cells take up water by osmosis and become turgid. Because their inner walls are rigid they are pulled apart, opening the pore. In darkness, water is lost and the inner walls move together closing the pore.

Test: Transportation In Plants - 1 - Question 13

The loss of water from the aerial parts of the plant during day time is known as:

Detailed Solution for Test: Transportation In Plants - 1 - Question 13

The loss of water in the form of vapour from living plants, particularly from the aerial parts, is known as transpiration. The process is in principle one of evaporation and diffusion. Loss of water vapour may occur from any part of the plant which is exposed to the air.

Test: Transportation In Plants - 1 - Question 14

An organism’s body has a large proportion of dead cells, have low energy needs, and can use relatively slow transport system. This organism could be :

Detailed Solution for Test: Transportation In Plants - 1 - Question 14

Plants: Plants do not move. They have a large proportion of dead tissues. Some plants are very tall. So, plants generally have relative slow transport system.

Test: Transportation In Plants - 1 - Question 15

Tissue that transports products of photosynthesis from the leaves where they are synthesized to other parts of the plant, are called:

Detailed Solution for Test: Transportation In Plants - 1 - Question 15

The phloem is arranged in long, continuous strands called vascular bundles that extend through the roots and stem and reach into the leaves as veins. vascular bundles also contain the xylem, the tissue that carries water and dissolved minerals from the roots to the shoots.

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