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NEET UG Reproduction in Organisms & Plants — practice questions — page 6

Explore 184 free Reproduction in Organisms & Plants questions in NEET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Reproduction in Organisms & Plants questions and exercises with answers

Showing questions 151–180 of 184.

Spot the odd one outRead the answer and worked solution →Colostrum (the first milk after childbirth) is rich in:Read the answer and worked solution →LH surge in the menstrual cycle triggers:Read the answer and worked solution →A single spermatogonium ultimately produces how many functional sperm cells?Read the answer and worked solution →The first milk produced after birth, rich in antibodies, is calledRead the answer and worked solution →The hormone that drives uterine contractions during childbirth (parturition) is:Read the answer and worked solution →Ovulation in a typical 28-day human menstrual cycle occurs around dayRead the answer and worked solution →The hormone detected by home pregnancy tests isRead the answer and worked solution →NEET · Bio · Human Reproduction · Sperm Structure PartsRead the answer and worked solution →NEET · Bio · Human Reproduction · Fertilisation Term — Gap FillRead the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →NEET · Bio · Human Reproduction · Hormone to Source GlandRead the answer and worked solution →True or false: evidence for evolutionRead the answer and worked solution →NEET · Biology · Tap the STIsRead the answer and worked solution →Order the sequence the chapter sets outRead the answer and worked solution →OriginsRead the answer and worked solution →HIV (Human Immunodeficiency Virus) primarily attacks which cells of the immune system?Read the answer and worked solution →Which contraceptive method ALSO prevents sexually transmitted infections?Read the answer and worked solution →Two true, one falseRead the answer and worked solution →Spot the odd one outRead the answer and worked solution →Amniocentesis was BANNED for sex-determination purposes in India by:Read the answer and worked solution →Oral contraceptive pills (OCPs) work primarily by:Read the answer and worked solution →A typical angiosperm embryo sac hasRead the answer and worked solution →NEET · Bio · Human Reproduction · Uterus RegionRead the answer and worked solution →Human pregnancy lasts approximately:Read the answer and worked solution →Spermatogenesis occurs in the:Read the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →The mature embryo sac (female gametophyte) in flowering plants typically has:Read the answer and worked solution →The tough outer wall (exine) of pollen grains is made ofRead the answer and worked solution →Oogenesis in humans beginsRead the answer and worked solution →

Worked practice questions

Spot the odd one out

Read exercise and reference answers
Questions
  1. Items
    1. Testis
    2. Chloroplast
    3. Ovary
    Odd item
    Chloroplast
  2. Items
    1. Gamete
    2. Zygote
    3. Nucleotide
    Odd item
    Nucleotide
  3. Items
    1. Photosynthesis
    2. Fertilisation
    3. Embryo
    Odd item
    Photosynthesis
One belongs elsewhere. Source: syllabus Biology, Human Reproduction.

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Colostrum (the first milk after childbirth) is rich in:

  1. Carbohydrates and lactose only
  2. Fats and saturated fatty acids
  3. Antibodies, especially IgA
  4. Vitamin D and dietary minerals
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Correct answer: C. Antibodies, especially IgA

Colostrum (first 2-3 days of milk) is rich in ANTIBODIES (especially IgA), providing PASSIVE IMMUNITY to the newborn. Recommended for the first feed. Mature milk follows after a few days.

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LH surge in the menstrual cycle triggers:

  1. Menstruation
  2. Implantation
  3. Ovulation
  4. Menopause
Show answer and solution

Correct answer: C. Ovulation

The menstrual cycle is regulated by a complex interplay of hormones from the hypothalamus, anterior pituitary, and ovaries. 1. **Follicular Phase**: FSH (Follicle Stimulating Hormone) stimulates the growth of follicles. As follicles grow, they secrete estrogen. 2. **The Surge**: Once estrogen levels reach a critical threshold, they exert a positive feedback effect on the anterior pituitary, causing a massive release of Luteinizing Hormone (LH). This is known as the **LH surge**. 3. **Ovulation**: The LH surge occurs around the middle of the cycle (day 14 in a 28-day cycle). This sudden spike in LH triggers the final maturation of the Graafian follicle, its rupture, and the release of the secondary oocyte into the fallopian tube. This process is called **ovulation**. 4. **Luteal Phase**: The ruptured follicle then transforms into the corpus luteum, which secretes progesterone to maintain the uterine lining. Therefore, the LH surge is the specific hormonal trigger for ovulation.

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