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Meghna Thapar 5 years, 6 months ago
Algae do not keep the embryo inside of themselves but release it into water. This was the first feature to evolve that separated plants from green algae. This is also the only adaptation shared by all plants. Over time, plants had to evolve from living in water to living on land. The evidence suggests that land plants evolved from a line of filamentous green algae that invaded land about 410 million years ago during the Silurian period of the Paleozoic era. All green algae (Chlorophyta) and plants share a common evolutionary ancestor. They both contain the photosynthetic pigments chlorophyll a and chlorophyll b. The two lineages diverged between 630 million and 510 million years ago.
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Gaurav Seth 5 years, 6 months ago
Antibiotics
These are the substances (produced wholly or partially by chemical synthesis) which in low concentrations inhibit the growth of microorganisms or destroy them by intervening in their metabolic processes.
Antibiotics are products of microbial growth and thus, antibiotic therapy has been likened to ‘setting on.e thief against another’.
Antibiotics are of two types :
- Bactericidal antibiotics have cidal (killing) effect on microbes. For example, penicillin, ofloxacin, amino glycosides, etc.
- Bacteriostatic antibiotics have a static (inhibitory) effect on microbes. For example, erythromycin, tetracycline, chloramphenicol, etc
Posted by Salomi Edward 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
All epithelia are separated from their underlying tissues by an extracellular basement membrane which is fibrous in nature. The basement membrane is the fusion of two lamina namely, the basal lamina and the reticular lamina. The lamina reticularis is attached to the basal lamina with collagen anchoring fibrils and fibrillin microfibrils. The two layers together are collectively referred to as the basement membrane.
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Meghna Thapar 5 years, 5 months ago
Massive amounts of gaseous exchange takes place in the leaves through tiny pores called stomata for the purpose of photosynthesis. The opening and closing of stomatal pores is controlled by the guard cells, when water flows into the guard cells, they swell, become curved and cause the pore to open whereas when the guard cells lose water, they shrink, become straight and close the stomatal pore.
Posted by ꧁༺★ṖŕīᑎƇɛ {Ƭĥɛ Ŀ❤Ѵɛ Ɠʊŕʊ}★༺꧂ ?? 5 years, 6 months ago
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Posted by Husan Dhaliwal 5 years, 6 months ago
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Meghna Thapar 5 years, 5 months ago
- Many amphibians, birds, fish and reptiles are oviparous and often make nests to protect their eggs.
- Examples of roundworms. Ascaris lumbricoides (also called human roundworm), which is the most common roundworm infection.
- Ophiosaurus or Asian glass lizard or Burmese glass lizard is a species of legless lizard found in Northeastern India, Southern China, Northern Myanmar.
- The marine stingrays and catfish are good examples of venomous fish.
Posted by Luvie Koza 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
1. Organise and classify - the organism can be easily categorised, this really helps making it easier to understand the characteristics of a specific organism in an organised chart.
2. Clarity and precision - these names are unique with each creature have only one scientific name. Helps avoid confusion created by common names.
3. Universal recognition - scientific names are standardised and accepted universally.
4. Stability - the names are retained even if the species are shifted to another genera based on new knowledge.
5. Inter specific relationship - binomial terms help understand the similarities and differences between different species belonging to the same genera, useful in establishing a relationship between the two.
Posted by ꧁༺★ṖŕīᑎƇɛ {Ƭĥɛ Ŀ❤Ѵɛ Ɠʊŕʊ}★༺꧂ ?? 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
Eubacteria
- Eubacteria are known as true bacteria, and are cauterized by the presence of a rigid cell wall, and if motile, a flagellum.
- The cyanobacteria or blue-green algae have chlorophyll a similar to green plants and are photosynthetic autotrophs.
- The cyanobacteria are unicellular, colonial or filamentous, marine or terrestrial algae, and the colonies are generally surrounded by gelatinous sheath.
- Some of the cyanobacteria can fix atmospheric nitrogen in specialized cells called heterocyst. For example- Nostoc and Anabaena
Posted by Husan Dhaliwal 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
The five-kingdom system was developed by Robert H. Whittaker in 1969 and was built on the work of previous biologists such as Carolus Linnaeus.
Living things can be classified into five major kingdoms:
- Kingdom Animalia
- Kingdom Plantae
- Kingdom Fungi
- Kingdom Protista
- Kingdom Monera (Bacteria)
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Carry Minati 5 years, 6 months ago
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