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Recent questions tagged sec-a
Questions
What is the number of chromosomes in the following cells of human male ? <br> a) Spermatids <br> b) Sertoli cells
cbsc
class 12
biology
human reproduction
sec-a
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
How many sperms are approximately present in an ejaculate of human male? What proportion of them should have normal size and shape?
cbsc
class 12
biology
human reproduction
sec-a
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
Production of sperms requires low temperature. How is it accomplished in human body?
cbsc
class 12
biology
human reproduction
sec-a
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
Name the disease that is caused due to abnormal increase in Lymphocytes of blood.
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Which day is observed as World AIDS Day?
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Expand NACO
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Against which diseases does the MMR vaccine give protection ?
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Why is it organ transplantation always done between very close relatives?
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
All human beings have Proto oncogenes. But all of them do not suffer from cancer. Why?
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Why is secondary immune response more intense than the primary immune response in humans.
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
It was diagnosed by a specialist that the immune system of the body of a patient has been suppressed. Name the disease the patient is suffering from and its causative agent.
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
How do virus-infected cells provide innate immunity to healthy cells?
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
What causes swelling of the lower limbs in patients suffering from filariasis?
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
What role do macrophages play in providing immunity to humans ?
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
What type of virus causes AIDS? Name its genetic material.
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Some allergens trigger sneezing and wheezing in human beings. What causes this type of response by the body?
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
How do interferons protect us?
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
State the function of mast cells in allergic response.
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
When does a human body elicit an anamnestic response ?
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
What is the reason of shivering in malarial patient ?
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Which microorganism is used to produce hepatitis B Vaccine ?
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Name the two major groups of cells required to attain specific immunity.
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
A person's nails and lips turn grey to bluish. Find out the disease he is suffering from. <br> Name the pathogen.
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Name the pathogen that causes malignant malaria.
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Breast fed babies have greater immunity than bottle fed babies. Why?
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Name the vector that spreads Chikungunya.
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Name the confirmatory test for typhoid ?
cbsc
class 12
biology
human health and diseases
sec-a
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Mention the type of evolution that has brought the similarity as seen in potato tuber and sweet potato.
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Pick out the ancestral line of Angiosperms from the list give below: Conifers, Seed ferns, Cycads, Ferns.
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
List the two characteristics of mutation that help in explaining evolution according to De Vries.
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
What did Louis Pasteur's experiments on 'killed yeast' demonstrate? <br>Name the theory that got disproved on the basis of his experiment.
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Identify the examples of convergent evolution from the following: <br> a. Flippers of penguins and dolphins. <br> b. Eyes of octopus and mammals<br> c. Vertebrate brains
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Mention what caused evolution according to de Vries. OR What causes speciation according to Hugo de Vries?
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Name the placental mammals corresponding to the Australian 'spotted cuscus' and 'Tasmanian tiger cat', which have evolved as a result of convergent evolution.
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Why are lichens regarded as pollution indicators?
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Are the thorns of Bougainvillea and tendrils of Cucurbita homologous or analogous? What type of evolution has brought such a similarity in them?
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Study the ladder of human evolution given above and answer the following questions : <br> a. Where did Australopithecines evolve ? <br> b. Write the scientific name of Java man.
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
What does Hardy-Weinberg equation $p^2 + 2pq + q^2 = 1$, convey?
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
When does a species become founders to cause founder effect?
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Coelacanth was caught in 1938 in South Africa. Why is it very significant in the evolutionary history of vertebrates?
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Comment on the similarity between the wing of a cockroach and the wing of a bird. What do you infer from the above with reference to evolution?
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Write the similarity between the wing of a butterfly and the wing of a bat. What do you infer from the above with reference to evolution?
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Identify the examples of homologous structures from the following: <br> a. Vertebrate hearts. <br> b. Thorns in Bougainvillea and tendrils of Cucurbita. <br> c. Food storage organs in sweet potato and potato.
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Write the formula to calculate allele frequency in future generations according to Hardy – Weinberg genetic equilibrium.
cbsc
class 12
biology
evolution
sec-a
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
A radiation causes ageing of skin, skin cancer, and inflammation of cornea called snow blindness. It also damages DNA. Name the radiation.
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
Jhum cultivation has been in practice from earlier days, but its considered more problematic these days. Why?
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
Why was the Montreal Protocol signed?
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
What is the noise level that can cause permanent impairment of hearing ability of human beings?
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
PM2.5 is responsible for causing greatest harm to human health. What is it? How is it harmful?
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
Why should the velocity of air between the plates of an electrostatic precipitator be low?
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
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