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Recent questions tagged sec-b
Questions
Why is Rhizobium categorised as a 'symbiotic bacterium'. How does it act as a biofertiliser?
cbsc
class 12
biology
microbes in humans welfare
sec-b
asked
Apr 17, 2019
by
priyanka.clay6
1
answer
List four advantages that a symbiotic mycorrhizal association provides to the host plant.
cbsc
class 12
biology
microbes in humans welfare
sec-b
asked
Apr 17, 2019
by
priyanka.clay6
1
answer
How does 'starter' added to milk help it set into curd?
cbsc
class 12
biology
microbes in humans welfare
sec-b
asked
Apr 17, 2019
by
priyanka.clay6
1
answer
Name the bacterium responsible for the large holes in 'Swiss cheese'. What are these holes due to?
cbsc
class 12
biology
microbes in humans welfare
sec-b
asked
Apr 17, 2019
by
priyanka.clay6
1
answer
Failure of fertilization leads to menstruation. Explain.
cbsc
class 12
biology
human reproduction
sec-b
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
Which cell organelle is present in the neck of the sperm? What is its significance?
cbsc
class 12
biology
human reproduction
sec-b
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
Why does fertilization take place in fallopian tube and not in uterus?
cbsc
class 12
biology
human reproduction
sec-b
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
Give reasons for the following : <br> a. The first half of menstrual cycle is called follicular phase as well as proliferative phase. <br> b. The second half of menstrual cycle is called luteal phase as well as secretory phase.
cbsc
class 12
biology
human reproduction
sec-b
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
Explain why there is no menstrual cycle before puberty, after menopause and during pregnancy.
cbsc
class 12
biology
human reproduction
sec-b
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
What is gynaecomastia? What is its cause during neonatal period?
cbsc
class 12
biology
human reproduction
sec-b
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
Blood of mother never mixes up with that of foetus. Yet it nourishes the foetus. How?
cbsc
class 12
biology
human reproduction
sec-b
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
An ovum allows the entry of only one sperm at a time. Why?
cbsc
class 12
biology
human reproduction
sec-b
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
Suppose the acrosome of mammalian spermatozoa does not function normally, how would it affect fertilization? Give reasons.
cbsc
class 12
biology
human reproduction
sec-b
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
Name the different types of cells that are responsible for producing the acquired immune response in a human body. How do these cells respond when a pathogen enters the body?
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
A patient showed symptoms of sustained high fever, stomach pain and constipation, but no blood clot in stools. Name the disease and its pathogen. Write the diagnostic test for the disease. How does the disease get transmitted?
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
How does a vaccine for a particular disease immunise the human body against that disease?
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Write the events that take place when a vaccine for any disease is introduced into the human body.
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
A person suffers from dry, scaly lesions on his skin, nails and scalp which is accompanied by intense itching. <br> i. What is the disease he is suffering from ? <br> ii. How would he have contracted the disease?
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Classify the following drugs into their respective groups <br> Smack, Hashish, Heroin and Charas
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Complete the following. <br> a. TB : Airborne :: Malaria : --------- <br> b. Colostrum : Passive immunity :: Vaccine : -----------
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Why should one take an immuno suppressants agent all through his life after an organ transplantation?
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Chewing of Tobacco causes increase in blood pressure. Justify.
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Why do sports persons often fall victims to Cocaine addiction?
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
A person suffering from Elephantiasis has an abnormally increased swelling in his lower limbs. What could be the reason for the swelling?
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
What would happen to the immune system, if thymus gland is removed from the body of a person?
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Given below are the pathogens and the diseases caused by them. Which out of these pairs is not correct matching pair and why ? <br> a. Wuchereria : Filariasis <br> b. Microsporum : Ringworm <br> c. Salmonella : Common Cold <br> d. Plasmodium : Malaria
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
A person has developed allergic reactions like sneezing, watery eyes, running nose and difficulty in breathing. What could be the reason for these symptoms? <br> How can it be controlled?
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Why do children of metro cities of India suffer from allergies and asthma?
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Name the missing organisms/ diseases in the table given below.
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
A group of viruses infect only nose and the respiratory passage but not the lungs. Mention the disease and its causative organism.
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
What is the role of histamines in inflammatory response? Name few drugs which reduces the symptoms of allergy.
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
What is the role of lymph nodes in our immune response ?
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Where are T cells and B cells formed? How do they differ from each other?
cbsc
class 12
biology
human health and diseases
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
What does the comparison between the eyes of Octopus and those of mammals say about their ancestry and evolution?
cbsc
class 12
biology
evolution
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
How is genetic drift different from gene migration?
cbsc
class 12
biology
evolution
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
How does 'fitness' of a population help in evolution?
cbsc
class 12
biology
evolution
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Give the sum total of all the allelic frequencies in a stable population. List any two factors which disturb the stability of a population. How does this disturbance affect the population?
cbsc
class 12
biology
evolution
sec-b
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
How is 'mutation' explained by Hugo de Vries different from the Darwinian variations?
cbsc
class
12
biology
evolution
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Why are the wings of butterfly and birds said to be analogous organs? Name the type of evolution, the analogous organs are a result of?
cbsc
class 12
biology
evolution
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Write Oparin and Haldane`s hypothesis about the origin of life on Earth. How does meteorite analysis favour this hypothesis?
cbsc
class 12
biology
evolution
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Convergent evolution leads to analogous structures. Explain with the help of an example.
cbsc
class 12
biology
evolution
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Divergent evolution leads to homologous structures. Explain with the help of an example.
cbsc
class 12
biology
evolution
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Categorise the following pairs of examples as convergent or divergent evolutions : <br>a. Eyes of Octopus and mammals. <br>b. Wings of butterfly and birds. <br> c. Tuber of sweet potatoes and potato. <br> d. Thorns in Bougainvillea and tendrils in Cucurbits.
cbsc
class
12
biology
evolution
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Name the ancestors of man based on the features given below : <br> a. Human-like meat eater with 900 cc brain lived in Java. <br> b. More human with brain size 1400 cc, lived in Central Asia, used hides and buried their dead. <br> c. Human-like, vegetarian, with brain capacity between 650 cc and 800 cc. <br> d. Man-like primate, that existed about 15 mya. Fossils found in Tanzania.
cbsc
class 12
biology
evolution
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
How does palaeontological evidence support evolution of organisms on Earth?
cbsc
class 12
biology
evolution
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Write about the ancestry and evolution of bat, horse and human on the basis of a comparative study of their forelimbs. What are these limbs categorised as?
cbsc
class 12
biology
evolution
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
List the two main propositions of Oparin and Haldane.
cbsc
class 12
biology
evolution
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
How do Darwin's finches illustrate adaptive radiation?
cbsc
class 12
biology
evolution
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Why are grains and vegetables produced in organic farms supposed to be better for human consumption than those produced in farms where chemical fertilizers, pesticides etc. has been used?
cbsc
class 12
biology
environmental issues
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
What are the advantages of CNG?
cbsc
class 12
biology
environmental issues
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
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