Plant Transport and Physiology

A plant cell is characterised by a single large sap vacuole. They enclose sap or water with dissolved inorganic and organic substances. It is surrounded by a membrane called as tonoplast. Plant cell vacuole maintains osmotic pressure for turgidity and osmosis. They also store useful as well as waste substances. The growth in terms of increase in size depends on the elongation of the cell. For elongation of the cell, the protoplasm needs to push against cell wall from inside. The generation of pushing force depends on the osmotic pressure created by substances stored in central vacuole. Thus, the correct answer is option D.

Gymnosperms, particularly cycads, are known for having the largest ovules and the largest male gametes among seed plants. They also include some of the largest tree species.

Gymnosperms do not have vessels in their xylem. Water conducting tissues present in them are tracheids.

Vascular tissues, specifically xylem and phloem, run vertically through the stem to transport water, minerals, and sugars between the roots and the leaves.

The root system is responsible for anchoring the plant securely in the ground and absorbing water and essential minerals from the soil.

Turgor pressure is the force exerted by the cell contents against the cell wall in plants, which helps maintain structural rigidity. Osmotic pressure drives the water movement that creates this force.

Agricultural failure is complex and can be caused by environmental stressors like drought, soil degradation, or biological threats like pests and diseases. Therefore, all listed factors contribute to potential crop failure.

Plants (biosphere) take water (hydrosphere) from the soil (geosphere). This interaction involves these three specific Earth systems.

Capillary action is the ability of a liquid to flow in narrow spaces without the assistance of external forces, driven by adhesion and cohesion.

Water provides turgor pressure to plant cells. When water is scarce, turgor pressure drops, causing the plant to wilt.

Most herbaceous plants are composed of approximately 80 to 90 percent water by mass.

Water is essential for nutrient transport, photosynthesis, and transpiration, but it does not dissolve soil itself; it dissolves nutrients within the soil.

Transpiration is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere.

Stomata are the tiny openings on the surface of leaves that allow for gas exchange and the release of water vapor.