Q. Which structure in leaves allows the gaseous reactants and products of photosynthesis to move in and out vascular bundle stoma Mesophyll Thylakoid?
stomata
Q. What allows reactants in and products out through the leaf?
Some cells, like the guard cells and spongy mesophyll cells regulate the products and reactants in the leaf to make photosynthesis run at optimal levels. Luckily, the stomata depends on guard cells to open and close them. This allows for control over transpiration and loss of water.
Q. What structure allows leaves to take in and release gases?
Q. Which layer of a leaf lets water and gases move in and out freely?
Stomata – Stomata are pores in the leaf that allow gas exchange where water vapor leaves the plant and carbon dioxide enters. Special cells called guard cells control each pore’s opening or closing.
Q. Which chemical is used to detect transpiration comparatively?
Cobalt chloride changes its colour on exposure to water. So, a paper dipped in cobalt chloride can be placed to both the upper and lower surfaces of a leaf as a qualitative test for transpiration.
Q. What is Symplastic pathway?
In symplastic pathway, the movement of water is in between the cytoplasm and the vacuoles through the plasma membranes and plasmodesmata and beyond the cortex of plant cells. The pathway is slower when compared to the apoplastic pathway.
Q. Is Apoplastic or Symplastic faster?
Apoplastic pathway is fast. Symplastic pathway is slower than the apoplastic pathway. More ion and water are transported through the apoplastic pathway in the cortex. Water and ion are mainly delivered through the symplastic pathway beyond cortex.
Q. What is difference between Apoplast and Symplastic pathway?
Apoplast includes the non-living components of a plant such as cell walls and the intracellular spaces. In contrast, in the symplastic pathway, water moves by the osmosis since water moves across the cell membranes. The main difference between apoplast and symplast is their mechanism of the water movement.
Q. How does the vacuolar pathway work?
Vacuolar pathway: Movement of water molecules in plant cells via the vacuoles located in the cytoplasm of the cell. Water moves by osmosis across the vacuoles of the cells of the root system. The water moves down a concentration gradient from the soil solution to the xylem.
Q. What is a water pathway?
Pathway of water movement in root: Water in the root moves through three pathways. Apoplast pathway: The apoplastic movement of water occurs exclusively through the cell wall without crossing any membrane. Symplast pathway: The symplastic movement of water occurs from cell to cell through the plasmodesmata.
Q. Which is the Symplast pathway of water movement?
The Difference Between Apoplast and Symplast
| Apoplast | Symplast |
|---|---|
| In apoplast, the water movement occurs by passive diffusion. | In symplast, the water movement occurs by osmosis. |
| In apoplast, the water movement is rapid. | In the symplast, the water movement is slower. |
Q. What are the two pathways through which water moves?
Pathway of water movements in roots – definition There are two pathways of water passage from root hairs to xylem inside the root, apoplast and symplast.
Q. Is turgor a pressure?
Turgor pressure is the hydrostatic pressure in excess of ambient atmospheric pressure which can build up in living, walled cells. Turgor is generated through osmotically driven inflow of water into cells across a selectively permeable membrane; this membrane is typically the plasma membrane.
Q. What are the three paths water can take?
From the root hair cells, water again moves by osmosis down a concentration gradient toward the xylem, and can take one of three paths – apoplast, symplast, or vacuolar.
Q. How does water move from root hair to Xylem?
As root hairs come in contact with water, they automatically absorb water in apoplast. At the endodermis, water passes through symplast. Once endodermis is crossed, water again is free to follow apoplast or symplast pathway, till it reaches xylem.
Q. What is Apoplastic movement of water?
In apoplastic movement, water moves from cell to cell through the intercellular spaces or walls of the cells and hence on the outer side of the plasma membrane. Majority of the water in roots is carried by the apoplastic pathway, except at the casparian strip.
Q. What is true for both Symplast and Apoplast movement of water in plants?
In the symplastic movement, the water moves along the same water potential gradient, but across the inter-connected cytoplasm (symplast) of the cells of the root system. On the other hand, in apoplastic movement, the movement of water is through adjacent cell walls (apoplast) from the root hair cell to the xylem.
Q. Which structure or compartment is separate from the Apoplastic transport route?
The structure which is separate from the apoplastic route is THE LUMEN OF SIEVE TUBE. Apoplastic route is found in plants where they facilitate the transport of water and solutes accross a tissue or organ.
Q. What would enhance water uptake by a plant cell?
have a faster rate of osmosis. What would enhance water uptake by a plant cell? stomata close, preventing CO2 from entering the leaf.
Q. What is meant by Symplast?
The symplast of a plant is the inner side of the plasma membrane in which water and low-molecular-weight solutes can freely diffuse. Symplast cells have more than one nucleus. The plasmodesmata allow the direct flow of small molecules such as sugars, amino acids, and ions between cells.
Q. Why is the Casparian strip important?
Casparian strip A band of waterproof, corky tissue that is found on the side and walls of the endodermis of roots. The strip prevents water from entering the pericycle except through the cytoplasm of endodermal cells; this may be important in producing root pressure.
Q. What is the most likely function of the Casparian strip?
The Casparian strip is impervious to water so can control the transportation of water and inorganic salts between the cortex and the vascular bundle, preventing water and inorganic salts from being transported to the stele through the apoplast, so that it must enter the cell membrane and move to the stele through the …
Q. What is the chemical nature of Casparian strip?
A primary cell wall impregnated with lignin makes for a very sturdy, chemically resistant structure, perfect for a protective barrier. In textbooks it is often said that the Casparian strip is made of suberin, the polymer of cork.
Q. Which pathway is interrupted by the Casparian strip?
apoplast
