In human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:

NEET-(Oct)2020 Human-Reproduction [class-xii ]

• Eyelids and eyelashes are formed
• Most of the major organ systems are formed
• The head is covered with fine hair
• Movement of the foetus
Correct Option: B  [ Most of the major organ systems are formed ]

Remark:

Progestogens alone or in combination with estrogens can be used as a contraceptive in the form of:

NEET-(Oct)2020 Reproductive-Health [class-xii ]

• Implants only
• Injections only
• Pills, injections and implants
• Pills only
Correct Option: C  [ Pills, injections and implants ]

Remark:

Which of the following STDs are not curable?

NEET-(Oct)2020 Reproductive-Health [class-xii ]

• Genital herpes, Hepatitis B, HIV infection
• Chlamydiasis, Syphilis, Genital warts
• HIV, Gonorrhoea, Trichomoniasis
• Gonorrhoea, Trichomoniasis, Hepatitis B
Correct Option: A  [ Genital herpes, Hepatitis B, HIV infection ]

Remark:

Select the option including all sexually transmitted diseases.

NEET-(Sept)2020 Reproductive-Health [class-xii ]

• Gonorrhoea, Syphilis, Genital herpes
• Gonorrhoea, Malaria, Genital herpes
• AIDS, Malaria, Filaria
• Cancer, AIDS, Syphilis
Correct Option: A  [ Gonorrhoea, Syphilis, Genital herpes ]

Remark:

In which of the following techniques, the embryos are transferred to assist those females who cannot conceive?

NEET-(Sept)2020 Reproductive-Health [class-xii ]

• ZIFT and IUT
• GIFT and ZIFT
• ICSI and ZIFT
• GIFT and ICSI
Correct Option: A  [ ZIFT and IUT ]

Remark:

From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask:

NEET-(Sept)2020 Evolution [class-xii ]

• CH₄, H₂, NH₃ and water vapor at 800°C
• CH₃, H₂, NH₄ and water vapor at 800°C
• CH₄, H₂, NH₃ and water vapor at 600°C
• CH₃, H₂, NH₃ and water vapor at 600°C
Correct Option: A  [ CH₄, H₂, NH₃ and water vapor at 800°C ]

Remark:

Embryological support for evolution was disapproved by:

NEET-(Sept)2020 Evolution [class-xii ]

• Karl Ernst von Baer
• Alfred Wallace
• Charles Darwin
• Oparin
Correct Option: A  [ Karl Ernst von Baer ]

Remark:

Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action?
A. Darwin's Finches of Galapagos islands.
B. Herbicide resistant weeds.
C. Drug resistant eukaryotes.
D. Man-created breeds of domesticated animals like dogs.

NEET-(Sept)2020 Evolution [class-xii ]

• only (A)
• (A) and (C)
• (B), (C) and (D)
• only (D)
Correct Option: C  [ (B), (C) and (D) ]

Remark:

Flippers of Penguins and Dolphins are examples of:

NEET-(Sept)2020 Evolution [class-xii ]

• Adaptive radiation
• Convergent evolution
• Industrial melanism
• Natural selection
Correct Option: B  [ Convergent evolution ]

Remark:

After about how many years of formation of earth, life appeared on this planet?

NEET-(Oct)2020 Evolution [class-xii ]

• 500 billion years
• 50 million years
• 500 million years
• 50 billion years
Correct Option: C  [ 500 million years ]

Remark: