Tag: mode of respiration in plants

Pneumatophores are specialized roots that grow upwards against gravity to facilitate gas exchange in waterlogged or swampy soil. Velamen is a spongy tissue in epiphytic roots, hydathodes are involved in guttation, and prop roots provide structural support.

• The roots of a plant take up air from the spaces between the soil particles.
• Root hairs are in contact with the air in the soil particles. 
• Oxygen from the air in soil particles diffuse into root hair and reach all the cells of the root where it is utilised in respiration. Hence, roots respire through air spaces.

Seeds are living organisms that continue to respire even when dormant. Respiration is an exothermic process that releases energy in the form of heat, which causes the temperature increase observed in the sack.

Cyanide-resistant respiration is a unique pathway found in many plants, fungi, and some bacteria. It involves an alternative oxidase that bypasses the cytochrome pathway, which is typically inhibited by cyanide.

While plants can absorb water from many sources the best place for this is the root system which is in contact with the soil where most of the water is found. The root system is usually extensive and has root hairs which help increase the surface area for water absorption. Water enters the root hair cells and then moves from cell to cell till it reaches the root cortex it goes on to the xylem vessels to be transported to the leaves.

So, the correct option is 'Root hair'.

Aerobic respiration takes place in the mitochondria and requires oxygen and glucose, and produces carbon dioxide, water, and energy. The chemical equation is 

The process by which cells obtain chemical energy by the consumption of oxygen and the release of carbon dioxide is known as respiration. In order to carry on respiration, plant cells need oxygen and a means of disposing of carbon dioxide just as animal cells do. In plants, each part such as root, stem performs respiration because plants do not possess any specialized organs like animals for the exchange of gases. 

In plants respiration also takes place through roots. In soil oxygenated air is present in air spaces between soil particles. This oxygen is absorbed into the roots by root hair present on the roots. The hairs of the roots are in direct contact with them. In fact, a root hair is a lateral tubular outgrowth of the outer epidermal cells of a root. The oxygen present in between the soil particles diffuse into the root hairs. From root hairs, oxygen is supplied to all the parts of roots for respiration. During respiration, oxygen is converted into carbon dioxide gas which is diffused in opposite direction i.e. out of the roots by the same root hairs which complete the process of respiration in roots.

The process by which cells obtain chemical energy by the consumption of oxygen and the release of carbon dioxide is known as respiration. In order to carry on respiration, plant cells need oxygen and a means of disposing of carbon dioxide just as animal cells do. In plants, each part such as root, stem performs respiration because plants do not possess any specialized organs like animals for the exchange of gases.

The process of respiration is expressed as:

Glucose + Oxygen → Carbon Dioxide + Water (+ Energy)