Category «Plants»

Varieties and useful properties of tomatoes

Tomato (or tomato, as it is historically known) has many varieties. Despite the huge number of years, during which it is grown all around the world, there is still no definite opinion about its definition. For example, some call tomato a vegetable, the latter argue that it is a fruit, others dismiss altogether, calling it …

Birch sap – one of the best medicines

Now, many gardeners are looking forward to the turn of the summer season, which this year is a little late because of the weather. Planting of many plants in the country is delayed by 2-3 weeks. Indeed, what can be done until the fruit and vegetable garden covered with a thick layer of snow. But …

Dahlia – King of flowers

One of the most elegant and at the same time spectacular colors can be called Dahlia. Since ancient times, this plant has attracted the attention of mankind, and for a time was considered really the king, it was in the garden of the kings and nobles, as legend has it, grew these flowers. Incidentally, the …

Fruits with the exotic appearance

In our world, there is so much more interesting and unusual. It happens, just watch and wonder. What if this extraordinary miracle is still tasty and healthy? Let’s look at the fruit, which is difficult to find in the market or supermarket, and that change all notions of how food should look like. Now, being …

Distinguishing characters of Pteridophytes

Pteridophytes: 1. The life cycle shows distinct heteromorphic alternation of generation. 2. Plant body of Sporophyte is dominant phase. 3. Sporophyte is differentiated into true root, stem and leaves. 4. Vascular tissue i.e xylem and phloem are present. Xylem lacks vessels but tracheids are present. In phloem sieve tubes and companion cells are absent. 5. …

Pteridophytes

This division includes club mosses, horsetails and ferns. The oldest known pteridophytes are fossils from the end of the silurian period, 380 million years ago. Pteridophyta constitutes the earliest known vascular plants. Vascular plants are those plants that contain the vascular tissue that is the conducting tissues of xylem and phloem. Sometimes all vascular plants …

Bryophytes

There are fossil records of blue green algae (Cyanobacteria) living 3000 million years ago and many eukaryotic organisms have existed for more than 1000 million years. However the first organisms to colonize the land, primitive plants did so only 420 millions years ago. The greatest simple problem to overcome in making the transition from water …

Algae

In Algae the plant body shows no differentiation into root, stem or leaf or true tissues. Such a plant body is called thallus. They do not have vascular tissues. The sex organs of this group of kingdom plantae are not surrounded by a layer of sterile cells. Algae are autotrophic organisms and they have chlorophyll. …

Systematics

Diversity in living organisms There is a great diversity among living organisms found on the planet earth. They differ in their structure, habit, habitat, mode of nutrition, and physiology. The Biodiversity of the earth is enormous. Current estimates suggest that the earth may have anywhere from 10 to over 40 million species of organisms, but …

Transpiration Pull Theory

This is also called as cohesion-tension theory put forward by Dixon and Joly (1894) and supported by Renner, Curtis and Clark. This theory is based on a number of features. Cohesion and Adhesion Mutual attraction between water molecules is called cohesion and this force may have a value as high as 350 atmospheres. The wall …