CBSE > Class 11 > Biology | CBSE Board | Homework Help

Ecological and commercial importance. Algae form organic food molecules from carbon dioxide and water through the process of photosynthesis, in which they capture energy from sunlight. ... Algae produce an estimated 30 to 50 percent of the net global oxygen available to humans and other terrestrial animals for respiration.

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What is cromosom

Posted by Om Patil 5 years, 9 months ago

CBSE > Class 11 > Biology

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What is normal temperature of human body?

Posted by Vinod Choudhary 7 years, 5 months ago

CBSE > Class 11 > Biology

3 answers

Guru Randhawa 7 years, 5 months ago

37°C and 98.7°F.

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Bhoomi Verma 7 years, 5 months ago

98.7 degree fahrenhit

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Abhishek Bonal 7 years, 5 months ago

37degree celcius

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What do you mean by alternation of generation in kingdom plantae?

Posted by Darsh Varshney 7 years, 5 months ago

CBSE > Class 11 > Biology

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What is meant by motile & non motile??

Posted by Abhishek Bonal 7 years, 5 months ago

CBSE > Class 11 > Biology

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Ashish Soni 7 years, 5 months ago

Movable and non movable oor non sterile or sterile

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What is viroids?

Posted by Guru Randhawa 7 years, 5 months ago

CBSE > Class 11 > Biology

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Utsav Kumar Shukla 7 years, 5 months ago

Viroids are the plant infectious pathogens.

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What is the importance of gelidium & gracilaria

Posted by Krishna Nair 7 years, 5 months ago

CBSE > Class 11 > Biology

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Describe briefly classifications of phylum mollusca.

Posted by Drakula .. 7 years, 5 months ago

CBSE > Class 11 > Biology

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Whe are living organisms classified

Posted by Aquib Raza 7 years, 5 months ago

CBSE > Class 11 > Biology

1 answers

Sakshi Singh 7 years, 5 months ago

Study of each and every living organism is not possible so we can classify organism to make study easier and divided it into convenient category in which same type of organism are placed

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Difference between chlorosis and necrosis

Posted by Ajay Chahar 4 years, 7 months ago

CBSE > Class 11 > Biology

1 answers

Sia ? 4 years, 7 months ago

Chlorosis refers to the yellowing of plant parts, mainly leaves and veins. Yellow spots appear on the leaves, giving a mosaic pattern.
Necrosis occurs due to injuries or diseases. Furthermore, necrosis takes place as a result of nutrient deficiency.

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What are gram positive bacteria?And distinguish between gram positive and gram negative bacteria.

Posted by Thiri Vikraman 7 years, 5 months ago

CBSE > Class 11 > Biology

1 answers

Sia ? 4 years, 6 months ago

In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test, which is traditionally used to quickly classify bacteria into two broad categories according to their type of cell wall.

Gram-Positive bacteria	Gram-Negative bacteria
Cell Wall
A single-layered, smooth cell wall	A double-layered, wavy cell-wall
Cell Wall thickness
The thickness of the cell wall is 20 to 80 nanometres	The thickness of the cell wall is 8 to 10 nanometres
Peptidoglycan Layer
It is a thick layer/ also can be multilayered	It is a thin layer/ often single-layered.
Teichoic acids
Presence of teichoic acids	Absence of teichoic acids
Outer membrane
The outer membrane is absent	The outer membrane is present (mostly)
Porins
Absent	Occurs in Outer Membrane
Mesosome
It is more prominent.	It is less prominent.
Morphology
Cocci or spore-forming rods	Non-spore forming rods.
Flagella Structure
Two rings in basal body	Four rings in basal body
Lipid content
Very low	20 to 30%
Lipopolysaccharide
Absent	Present
Toxin Produced
Exotoxins	Endotoxins or Exotoxins
Resistance to Antibiotic
More susceptible	More resistant
Examples
Staphylococcus, Streptococcus, etc.	Escherichia, Salmonella, etc.
Gram Staining
These bacteria retain the crystal violet colour even after they are washed with acetone or alcohol and appear as purple-coloured when examined under the microscope after gram staining.	These bacteria do not retain the stain colour even after they are washed with acetone or alcohol and appear as pink-coloured when examined under the microscope after gram staining.

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I want to know the changes in the syllabus as well as blueprint of classes 11 and 12 Biology

Posted by Shubha Varma 7 years, 5 months ago

CBSE > Class 11 > Biology

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Human parts

Posted by Nokesh Tondre 7 years, 5 months ago

CBSE > Class 11 > Biology

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Numbre of protofilament in microtubulr is:

Posted by Mahemdra Kumar 7 years, 5 months ago

CBSE > Class 11 > Biology

1 answers

Priya Priya 7 years, 5 months ago

The outer diameter of a microtubule is about 24 nm while the inner diameter is about 12 nm.

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What is the thallus organisation ???

Posted by Priya Mishra 7 years, 5 months ago

CBSE > Class 11 > Biology

1 answers

Mr. Thakur 7 years, 5 months ago

An organism or structure resembling a thallus is called thalloid, thallodal, thalliform, thalline or thallose. A thallus usually names the entire body of a multicellular non-moving organism in which there is no organisations of the tissues into organs.

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What are phycobiont and mycobiont ?

Posted by Sanjay Rawat 7 years, 5 months ago

CBSE > Class 11 > Biology

4 answers

Mr. Thakur 7 years, 5 months ago

Lichens are symbiotic association between algea and fungi. The algal part is called Phycobiont and the fungal part are called Mycobiont. They are good pollution indicator as they do not grow in polluted area.

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∂Αяѕнαиαα ყα∂Αѵ ??? 7 years, 5 months ago

Phycobiont refers to the algal component of the lichens and mycobiont refers to the fungal component.

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Sanjay Rawat 7 years, 5 months ago

Is anyone there

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Sanjay Rawat 7 years, 5 months ago

Hello

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Is otba is added to our questin paper this year