Page 69 - Science Class 07

Frogs This energy is used by the plant for carrying out

Frogs are amphibians, i.e., they can live on land its various life processes. Thus, like other
as well as in water. They have thin and moist organisms, plants also respire for their survival.
skin for respiratory exchange of gases. The respira on in plants differs from that of
However, they also have lungs. But exchange of animals. In other words, in plants, each part
gases takes places through their skin. Their skin can independently take in oxygen from air,
is richly supplied with blood capillaries. u lise it to obtain energy and give out carbon
dioxide.
Nostril
Let’s read about some interes ng facts about
Mouth Cavity respira on in plants:

v Plants require much less energy than most

Lung animals and respire more slowly.
v They do not breathe, diffusion provides
sufficient oxygen for their respiratory
needs. Different parts of the plants such as
Slimy Skin for roots, stems and leaves take in oxygen and
Exchange of Gases
release carbon dioxide through the process
of diffussion.
Respira on in Frog
Birds v It is interes ng to note that respira on is
the reserve of photosynthesis. Respira on
Birds also have lungs present in their chest
releases energy from foods, whereas
cavity. Lungs are further connected with air
photosynthesis stores energy in food. The
filled sacs that help in respira on and make
products of respira on are CO and water.
their body lighter to fly. 2
The products of photosynthesis are glucose
and oxygen.
Humeral air sac
Cervical air sac v Respira on occurs in all living cells and
Lung Trachea occurs in both light and dark. On the other
Syrinx hand, photosynthesis takes place only in
Interclavicular
air sac green cells and only in the light. Leaves and

Abdominal air sac Anterior other green parts of plant carry on both
thoracic photosynthesis and respira on during the
Posterior thoracic air sac air sac
day when they receive sunlight. Under
Respira on in Birds
these condi ons, photosynthesis proceeds
RESPIRATION IN PLANTS more rapidly than respira on. During

Like other animals, plants also respire. Plants photosynthesis, plants take in much more
also need energy. The plants get energy CO than they release and much less
2
through the process of respira on in which oxygen that they release. Therefore, the
glucose food breaks down in the presence of result is, that the plants give out oxygen
oxygen to form carbon dioxide and water with (O ) during the day me.
2
the release of energy.

Science-7 69