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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

At which stage of HIV infection does one usually shows symptoms of AIDS?

  • When viral DNA is produced by reverse transcriptase

  • When HIV replicates rapidly in helper T- lymphocytes and damages large number of these

  • With 15 days of sexual contact with an infected person

  • When the infecting retrovirus enters host cell


C.

With 15 days of sexual contact with an infected person

HIV enters into T -lymphocytes replicates and produces progeny viruses. The progeny viruses released in the blood other helper T-lymphocytes.This is repeated leading to a progressive decrease in the body of the infected person. During this period, the person suffers from bouts of fever, diarrhoea and weight loss. The person starts suffering from an infection.

HIV enters into T -lymphocytes replicates and produces progeny viruses. The progeny viruses released in the blood other helper T-lymphocytes.This is repeated leading to a progressive decrease in the body of the infected person. During this period, the person suffers from bouts of fever, diarrhoea and weight loss. The person starts suffering from an infection.

424 Views . 12 Shares

The birth control device not used by women is :
  • Diaphragm
  • Oral pill
  • Condom
  • Copper T

C.

Condom
950 Views . 4 Shares

The prenatal technique to determine the genetic disorders in a foetus is called :
  • Laproscopy
  • Amniocentesis
  • Abstinence
  • Coitus nterruptus.

B.

Amniocentesis
495 Views . 8 Shares

Progesterone is the contraceptive pill which :
  • Prevents ovulation
  • prevent entry of sperms
  • prevent implantation
  • All the above

D.

All the above
505 Views . 10 Shares

The main factor for the growth of human population in India is :
  • high birth rate
  • less death rate
  • lack of education
  • All the above

D.

All the above
457 Views . 9 Shares

What is correct about a test tube baby?
  • Fertilization in female's genital tract and growth in test tube
  • Rearing of premature born baby in an incubator
  • Fertilization outside and gestation inside mother's womb
  • Both fertilization and development are done outside the female genital tract.

C.

Fertilization outside and gestation inside mother's womb
462 Views . 11 Shares

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