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In green plants chlorophyll occurs in membranous disklike units (thylakoids) in organelles called chloroplasts. Chlorophyll is one of the most important pigments in nature. Chloroplasts are found in plant leaves and contain the pigment chlorophyll. This green pigment absorbs light energy needed for photosynthesis to occur. Chloroplasts contain an internal membrane system consisting of structures called thylakoids that serve as the sites of conversion of light energy to chemical energy.

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Kingdom protista is known for unicellular eukaryotes.but there are some algae which are also unicellular eukaryotic but still they placed in Kingdom plantae .why?

Posted by Gohel Khyati Bk 7 years, 4 months ago

CBSE > Class 11 > Biology

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Meghna Thapar 5 years, 4 months ago

The Protist Kingdom consists of mostly unicellular organisms that can have characteristics similar to plants, animals or fungi. Characteristics of Protists: mostly unicellular, few multicellular, eukaryotic, can be heterotrophic or autotrophic. Protist has many organisms that are related to the other kingdoms of animals, plants, and fungi. Protists is a word that is know used as a "eukaryote that isn't a plant, animal, or fungus."

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How express a floral formula

Posted by Partha Pratim Choudhury 7 years, 4 months ago

CBSE > Class 11 > Biology

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Meghna Thapar 5 years, 4 months ago

The writing of floral formula one should start from bract and bracteole then symmetry and *** of flower, calyx, corolla, androecium and gynoecium. The number of parts of each organ is indicated in figures (1, …… 4, 5) after the relevant symbol (K, C, A, G). Floral diagram is a graphic representation of flower structure. It shows the number of floral organs, their arrangement and fusion. Different parts of the flower are represented by their respective symbols. Floral diagrams are useful for flower identification or can help in understanding angiosperm evolution.

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What is viroids

Posted by Shashi Kant Kumar 7 years, 4 months ago

CBSE > Class 11 > Biology

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Gohel Khyati Bk 7 years, 4 months ago

Viroids are infectious agents which lack protein coat and have less weight.

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Adnan Ahemad 7 years, 4 months ago

Viroids are different from viruse this also harmful for us than viruse

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Explain region of meristmstic in short?

Posted by Divya Prabha 7 years, 4 months ago

CBSE > Class 11 > Biology

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Ritu Thapliyal 7 years, 4 months ago

Meristematic tissue found in zones of the plant where growth can take place bcz of their ability of rapid division

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What do you understand by glycocalyx

Posted by Amar Nath Mishra 7 years, 4 months ago

CBSE > Class 11 > Biology

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Mudita Sahu 7 years, 4 months ago

Glycocalyx are the carbohydrate coating on the surface of prokaryotic or eukaryotic cells. Glycocalyx are the recognition moieties which help cells to recognise each other. These can either be glycolipids or glycoproteins projecting from the cell membrane. It cushions the plasma membrane and protects it from injury. glycococalyx also help cells in binding with each other and they also play a great role in immunity as the immune system of our body recognises these glycoproteins to produce antibodies.

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What is polymerous

Posted by Amar Nath Mishra 7 years, 4 months ago

CBSE > Class 11 > Biology

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What happens to cell in absence of lysosome????

Posted by Lathashree Ms 7 years, 4 months ago

CBSE > Class 11 > Biology

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Meghna Thapar 5 years, 4 months ago

Lysosomes are called ‘suicide bags of the cell’ are membrane bound organelles containing hydrolytic enzymes.

In their absence the following might result:

Cancer. Cells need to die once they have divided a certain amount of times as they gather genetic damage. Cells which continue to live past their lifespan will accumulate enough mutations to become cancerous.
Impaired immunity. Cell mediated immunity will take a hit as lysosomes are responsible for the digestion of ingested pathogen (lysosome fuses with phagosome) by phagocytes like macrophages and the subsequent presentation of processed peptides to activate humoral immunity.
Metabolic diseases. Synthesis of certain bio-molecules will be affected as catabolic enzymes required for breaking of complex bio-molecules into simpler ones are absent without the presence of lysosome.

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What are differences between White blood cells and red blood cells

Posted by Abhishek Sharma 7 years, 4 months ago

CBSE > Class 11 > Biology

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Meghna Thapar 5 years, 4 months ago

Red blood cells do not have a nucleus on maturity. WBCs are characterized by the presence of a large central nucleus. Due to the presence of haemoglobin, these cells appear red in colour. These cells are colourless, as they do not have any pigment. White blood cells are larger than red blood cells, and unlike red blood cells, they have a normal nucleus and mitochondria.

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How important is the presence of air bladder in Pisces??

Posted by Shruti Hooda 7 years, 4 months ago

CBSE > Class 11 > Biology

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Sunny Bhardwaj 7 years, 4 months ago

Due to that they are light weight and can fly easily

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What is triple fertilization?

Posted by Vivek Anand 7 years, 4 months ago

CBSE > Class 11 > Biology

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what is autoclaving and how it is used to kill viruses??

Posted by Hridyanshu Bhan 7 years, 4 months ago

CBSE > Class 11 > Biology

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Meghna Thapar 5 years, 4 months ago

Autoclaves provide a physical method for disinfection and sterilization. They work with a combination of steam, pressure and time. Autoclaves operate at high temperature and pressure in order to kill microorganisms and spores.

They are used to decontaminate certain biological waste and sterilize media, instruments and lab ware. Regulated medical waste that might contain bacteria, viruses and other biological material are recommended to be inactivated by autoclaving before disposal.

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What is alternation of generation?

Posted by Ritu Thapliyal 7 years, 4 months ago

CBSE > Class 11 > Biology

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Meghna Thapar 5 years, 4 months ago

Alternation of generations, also called metagenesis or heterogenesis, in biology, the alternation of a sexual phase and an asexual phase in the life cycle of an organism. The two phases, or generations, are often morphologically, and sometimes chromosomally, distinct. The fern is an example of alternation of generations, in which both a multicellular diploid organism and a multicellular haploid organism occur and give rise to the other. ... The large, leafy fern is the diploid organism. On the undersurface of its fronds or leaves, its cells undergo meiosis to create haploid cells.

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What is protein

Posted by Aditya Poddar 7 years, 4 months ago

CBSE > Class 11 > Biology

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Vivek Anand 7 years, 4 months ago

Proteins are large biomolecules or macromolecules consisting of one or more long chain of amino acid residues.

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What is homoestasis

Posted by Nuah Walker 7 years, 4 months ago

CBSE > Class 11 > Biology

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Meghna Thapar 5 years, 4 months ago

Homeostasis, any self-regulating process by which biological systems tend to maintain stability while adjusting to conditions that are optimal for survival.

Homeostasis Examples

Humans' internal body temperature is a great example of homeostasis. ...
Glucose is the most basic form of sugar, and the only type the body can use directly. ...
When bacteria or viruses that can make you ill get into your body, your lymphatic system kicks in to help maintain homeostasis.

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What are beta plated secondary proteins

Posted by Darshna Thanvi 7 years, 4 months ago

CBSE > Class 11 > Biology