Transportation in Plants MCQ

Correct answer: c. both xylem and phloem

Explanation: In a plant, a vascular bundle is made up of two tissues: xylem and phloem, and it is a part of the transport system. Substances are carried by both tissues. Xylem plays an important role of conducting water and minerals, while Phloem has the task of conducting the food.

Correct answer: c. Unidirectional

Explanation: The term "unidirectional movement" refers to molecular movement in only one direction. In terms of transportation, the xylem is unidirectional, which means that water molecules go from the roots to the top of the plant. Water and minerals are transported from the roots to the leaves via the xylem, which runs through the stem. As a result, the water rises.

Correct answer: a. True

Explanation: The movement of the fluid substance (cytoplasm) within a plant or animal cell is known as cytoplasmic streaming, also known as protoplasmic streaming. Within cells, the motion delivers nutrients, proteins, and organelles. Short-distance active transport of molecules is aided by cytoplasmic streaming. It's a form of symplastic movement that's seen in Hydrilla and Tradescantia cells.

Correct answer: b. translocation

Explanation: Translocation is a biological mechanism that happens in all plants and involves the transport of water and other soluble nutrients from one section of the plant to another via the xylem and phloem. It is the movement of a soluble photosynthetic product or food from the leaves to other plant components. For translocation, food molecules are made to reach a section of the phloem where they are carried up or down, called the sieve tubes to all regions of the plant, including the roots.

The necessary osmotic pressure for food to go uphill and downward is provided through Translocation process which is performed using the ATP Energy.

Correct answer: transpiration

Explanation: Plants lose water vapour through their stomata, which is a process known as transpiration. When the temperature is extremely hot, water from the stem and roots travels upwards or is 'drawn' into the leaves, cooling the plant. The elimination of excess water from the plant is accomplished through evaporation and guttation and exudation.

Correct answer: a. increase

Explanation: With a drop in air pressure, the rate of transpiration will rise. As the atmospheric pressure lowers, air will easily flow out of the plant. As a result, the rate of transpiration rises, and plants lose water more readily.

Correct answer: c. imbibition

Explanation: Water is absorbed by hydrophilic-protoplasmic and cell wall elements in plant cells, which is referred to as imbibition. It promotes seed enlargement, which causes the seed coat, or testa, to break. Water is moved into the ovules, which are maturing into seeds, by imbibition.

Correct answer: b. guard cells

Explanation: Guard cells surround each stoma. They open and close the stomata to assist regulate the rate of transpiration. As water enters the cell, the thin side expands like a balloon and pulls the thick side along with it, making a crescent; the conjoined crescents form the pore's opening.

Correct answer: b. hypertonic

Explanation: A hypertonic solution is one in which the concentration of solutes outside the cell is higher than the concentration inside the cell. Water osmotically moves out of a cell when it is placed in a hypertonic solution. The soluble concentration outside the cell is higher than inside. As a result, water molecules travel from within the cell to outside.

Correct answer: a. transpiration

Explanation: Some plants' leaves wilt in the middle of the day and recover afterwards. Even when there is enough of water in the soil, the leaves of some plants, such as Balsam, wilt during the midday hours. During mid-day in such cases, the rate of transpiration exceeds the rate of absorption of water by the roots. Turgidity is thus lost in the cells. As a result of this high transpiration, the leaves wilt.

Correct answer: c. ATP available

Explanation: Apart from the ATP, rest of the factors such as Pressure, Temperature and Concentration Gradient affect the rate of diffusion; however, as diffusion is a passive process, it does not require the energy released in the form of ATP.