Select the correct option of haploid cells from the following groups:

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

• Primary oocyte, Secondary oocyte, Spermatid
• Secondary spermatocyte, First polar body, Ovum
• Spermatogonia, Primary spermatocyte, Spermatid
• Primary spermatocyte, Secondary spermatocyte, Second polar body
Correct Option: B  [ Secondary spermatocyte, First polar body, Ovum ]

Remark:

Match the following columns and select the correct option:

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

• (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
• (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
• (A)-(i), (B)-(III), (C)-(II), (D)-(IV)
• (A)-(II), (B)-(I), (C)-(IV), (D)-(iii)
Correct Option: D  [ (A)-(II), (B)-(I), (C)-(IV), (D)-(iii) ]

Remark:

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:

The number of contrasting characters studied by Mendel for his experiments was:

NEET-(Oct)2020 [Principles-of-Inheritance-and-Variation] [class-xii ]

• 14
• 4
• 2
• 7
Correct Option: D  [ 7 ]

Remark:

Chromosomal theory of inheritance was proposed by:

NEET-(Oct)2020 [Principles-of-Inheritance-and-Variation] [class-xii ]

• Sutton and Boveri
• Bateson and Punnet
• T. H. Morgan
• Watson and Crick
Correct Option: A  [ Sutton and Boveri ]

Remark:

The best example for pleiotropy is:

NEET-(Oct)2020 [Principles-of-Inheritance-and-Variation] [class-xii ]

• Skin colour
• Phenylketoneuria
• Colour Blindness
• ABO Blood group
Correct Option: B  [ Phenylketoneuria ]

Remark:

E.coli has only 4.6 × 10⁶ base pairs and completes the process of replication within 18 minutes; then the average rate of polymerisation is approximately:

NEET-(Oct)2020 [Molecular-Basis-of-Inheritance] [class-xii ]

• 2000 base pairs/second
• 3000 base pairs/second
• 4000 base pairs/second
• 1000 base pairs/second
Correct Option: A  [ 2000 base pairs/second ]

Remark:

Who coined the term 'Kinetin'?

NEET-(Oct)2020 [Molecular-Basis-of-Inheritance] [class-xii ]

• Skoog and Miller
• Darwin
• Went
• Kurosawa
Correct Option: A  [ Skoog and Miller ]

Remark: