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organisms are dried, pressed, mounted and labelled in a herbarium. it is a quick referral for the study of organisms.
keys are analytical in nature.each statement of a key is called a lead and it consists of contrasting pairs of one organism's characters.
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Sia ? 6 years, 5 months ago
The spectrum of diversity in the living world can be known only through the study of taxonomy.
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Sree Sowmya Dantuluri 6 years, 5 months ago
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Meghna Thapar 5 years, 4 months ago
The ampulla of Vater, also known as the hepatopancreatic ampulla or the hepatopancreatic duct, is formed by the union of the pancreatic duct and the common bile duct. The ampulla is specifically located at the major duodenal papilla.
The ampulla of Vater is an important landmark halfway along the second part of the duodenum that marks the anatomical transition from foregut to midgut, and hence the point where the celiac trunk stops supplying the gut and the superior mesenteric artery takes over.
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Sia ? 6 years, 5 months ago
Majority of pteridophytes are homosporous, while some of them are heterosporous. Selaginella and salvinia are heterosporous. Basically the presence of heterospory in certain pteridophytes is a precursor of seed habits of higher plants, like gymnosperms and angiosperms.
Posted by Bhuvaneswari Giridharan 6 years, 5 months ago
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Need for Biological Classification:
- To study and include each organism along with its identification and habitat.
- To establish the relationship among different organisms and to know about their evolution.
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Meghna Thapar 5 years, 5 months ago
Cockroaches are omnivores that eat plants and meat. They have been recorded to eat human flesh of both the living and the dead, although they are more likely to take a bite of fingernails, eyelashes, feet and hands. The bites may cause irritation, lesions and swelling.
Posted by It Is Not Fake 6 years, 5 months ago
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Paurometabolous development is gradual metamorphosis. In this form of development, immature stages (nymphs) resemble small adults and typically have external wing buds.
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Monocot Leaf
Symmetry: Isobilateral
Stomata distribution: Amphistomatic i.e., stomata equally distributed on both the surfaces.
Bulliform cells: Present on upper epidermis.
Mesophyll: Only spongy parenchyma is present which has very small intercellular spaces.
Bundle sheath: Made of parenchyma but just above and below the vascular bundles are found sclerenchymatous cells (upto epidermis)
Dicot Leaf
Symmetry: Dorsiventral
Stomata distribution: Hypostomatic i.e., stomata present on lower surface of leaf.
Bulliform cells: Usually absent.
Mesophyll: Made up of two types of tissues: Palisade parenchyma and spongy parenchyma with large intercellular spaces.
Bundle sheath: Made up of parenchyma. Just above and below the vascular bundle some parenchymatous cells or collenchymatous cells are present up to epidermis.
Shashant Pandey 6 years, 5 months ago
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Meghna Thapar 5 years, 5 months ago
A mango is a juicy stone fruit (drupe) produced from numerous species of tropical trees belonging to the flowering plant genus Mangifera, cultivated mostly for their edible fruit. Most of these species are found in nature as wild mangoes. The genus belongs to the cashew family Anacardiaceae. The mango (Mangifera indica), a delicious, fleshy fruit with a large pit (endocarp). Native to India and Southeast Asia, this tree is grown throughout tropical regions of the world. It belongs to the sumac family (Anacardiaceae), along with poison oak, poison sumac and the cashew tree.
Posted by Nanu Kaur 6 years, 5 months ago
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Meghna Thapar 5 years, 5 months ago
Classification of Tiger:
- Domain: Eukarya.
- Kingdom: Animalia.
- Phylum: Chordata.
- Class: Mammalia.
- Order: Carnivora.
- Family: Felidae.
- The tiger (Panthera tigris) is the largest extant cat species and a member of the genus Panthera.
The mango (Mangifera indica), a delicious, fleshy fruit with a large pit (endocarp). Native to India and Southeast Asia, this tree is grown throughout tropical regions of the world. It belongs to the sumac family (Anacardiaceae), along with poison oak, poison sumac and the cashew tree.
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Meghna Thapar 5 years, 4 months ago
On the basis of their functions, animal tissues are classified into four major types – epithelial tissues, muscular tissues, connective tissues and nervous tissue.
- Epithelial Tissue:
It is the simplest tissue and protective in nature. The cells of this tissue are tightly packed and they form a continuous sheet. They contain a very little or no intercellular space. It covers most organs and cavities within the body. The skin, the lining of the mouth, the lining of blood vessels, lung alveoli and kidney tubules are all made of epithelial tissue. Anything entering or leaving the body crosses at least one layer of epithelium. As a result, the permeability of the cells of various epithelia plays an important role in regulating the exchange of materials between the body and the external environment and also between different parts of the body. All the epithelium is usually separated from the underlying tissue by an extracellular fibrous basement membrane.
ii. Connective Tissue:
Connective tissue is the binding and supporting tissue of the animal body. Matrix forms the main bulk of this tissue. The cells are loosely spaced and less in number. The matrix may be jelly like, fluid, dense or rigid. The nature of matrix differs in concordance with the function of the particular connective tissue.
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For the preparation of herbarium sheets, a sheet of about 29 x 41 cm is cut from chart paper. Dried specimens are mounted on the sheets with the help of glue or cellotape. A label is pasted on sheets at lower right comer. Herbarium is “a collection of plant specimens which have been dried and pressed and arranged in the sequence of an accepted classifications”. It forms a store house for future use. Herbarium is “a collection of plant specimens which have been dried and pressed and arranged in the sequence of an accepted classifications”. It forms a store house for future use. The preparation of Herbarium involves the following steps: ... The specimens are fixed on the sheets by applying glue or adhesive.
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Meghna Thapar 5 years, 5 months ago
In human beings, air is taken into the body through the nostrils, is filtered by fine hairs that line the passage. When air passes through the nasal passage, the dust particles and other impurities present in it are trapped by nasal hair and mucus so that clean air goes into the lungs. From here, the air passes through the throat and into the lungs. Trachea does not collapse even when there is no air in it because it is supported by rings of soft bones called cartilage.
Within the lungs, the passage divides into smaller and smaller tubes which finally terminate in balloon-like structures which are called alveoli. The alveoli provide a surface where the exchange of gases can take place. The walls of the alveoli contain an extensive network of blood-vessels. When we breathe in, the ribs are lift up and the diaphragm flattens which increases the size of the chest cavity. Because of this, air is sucked into the lungs and fills the expanded alveoli. The blood brings carbon dioxide from the rest of the body for release into the alveoli, and the oxygen in the alveolar air is taken up by blood in the alveolar blood vessels to be transported to all the cells in the body. During the breathing cycle, when air is taken in and let out, the lungs always contain a residual volume of air so that there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.
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Meghna Thapar 5 years, 4 months ago
Apocynaceae (from Apocynum, Greek for "dog-away") is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly known as the dogbane family, because some taxa were used as dog poison.[2] Members of the family are native to the European, Asian, African, Australian, and American tropics or subtropics, with some temperate members. The former family Asclepiadaceae (now known as Asclepiadoideae) is considered a subfamily of Apocynaceae and contains 348 genera.
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