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NEET UG Neet B06 — practice questions

Explore 35 free Neet B06 questions in NEET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Neet B06 questions and exercises with answers

Showing questions 1–30 of 35.

Which innermost anther wall layer nourishes developing pollen?Read the answer and worked solution →In a two-celled pollen grain, which cell divides to form two male gametes?Read the answer and worked solution →A diploid megaspore mother cell undergoes meiosis. What is produced?Read the answer and worked solution →How does the functional megaspore reach the typical eight-nucleate stage?Read the answer and worked solution →Which embryo-sac cells bear a filiform apparatus that guides the pollen tube?Read the answer and worked solution →In papaya, male and female flowers occur on separate plants. This prevents:Read the answer and worked solution →Pollen release and stigma receptivity occur at different times. This primarily reduces:Read the answer and worked solution →Which arrangement reduces self-pollination by spatial separation?Read the answer and worked solution →How does a pistil recognise compatible pollen?Read the answer and worked solution →Which pair correctly states benefits of seeds and fruits?Read the answer and worked solution →Why could apomixis help maintain desirable hybrid crop traits?Read the answer and worked solution →After fertilisation, the ovule and its integuments become, respectively:Read the answer and worked solution →One primary spermatocyte completes meiosis I and II. How many spermatids result?Read the answer and worked solution →Spermatid transformation and sperm release are called, respectively:Read the answer and worked solution →Which pairing correctly describes hormone action in the testis?Read the answer and worked solution →Primary oocytes formed during fetal life remain arrested in:Read the answer and worked solution →What triggers completion of meiosis II in a human secondary oocyte?Read the answer and worked solution →During the follicular phase, regenerating endometrium accompanies rising secretion of:Read the answer and worked solution →Without fertilisation, corpus luteum degeneration leads to menstruation because:Read the answer and worked solution →Changes induced after the first sperm contacts the zona pellucida help to:Read the answer and worked solution →Implantation is the embedding of which stage in the uterine endometrium?Read the answer and worked solution →Which pair of hormones is secreted by the placenta?Read the answer and worked solution →Lactation refers to which process?Read the answer and worked solution →Which combination helps reduce STI transmission?Read the answer and worked solution →Why is early STI diagnosis important even when symptoms are mild?Read the answer and worked solution →Which pair can spread through shared infected injection needles as well as sexual contact?Read the answer and worked solution →Which use of amniocentesis is appropriate for prenatal diagnosis?Read the answer and worked solution →Which statement about an infertile couple is correct?Read the answer and worked solution →For GIFT, a donor ovum is placed in a recipient’s:Read the answer and worked solution →Which is a reason for MTP?Read the answer and worked solution →

Worked practice questions

Which innermost anther wall layer nourishes developing pollen?

  1. Epidermis
  2. Tapetum
  3. Endothecium
  4. Middle layers
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Correct answer: B. Tapetum

The tapetum is the innermost microsporangial wall layer and nourishes developing pollen. The outer three layers mainly protect the anther and aid dehiscence.

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In a two-celled pollen grain, which cell divides to form two male gametes?

  1. Vegetative cell
  2. Tapetal cell
  3. Generative cell
  4. Microspore mother cell
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Correct answer: C. Generative cell

The haploid generative cell divides mitotically to produce two male gametes. The vegetative cell supports pollen-tube growth; the mother cell has already undergone meiosis.

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A diploid megaspore mother cell undergoes meiosis. What is produced?

  1. Four haploid megaspores
  2. Two diploid megaspores
  3. Eight haploid eggs
  4. Four diploid embryo sacs
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Correct answer: A. Four haploid megaspores

Meiosis of one diploid megaspore mother cell produces four haploid megaspores. Usually only one remains functional and develops into the embryo sac.

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More Biology topics

Genetics and EvolutionReproduction in Organisms & PlantsBiotechnology and ApplicationsBiodiversity and ConservationThe Living World & Biological ClassificationNeural Control and Chemical CoordinationPrinciples of Inheritance and VariationAnimal Kingdom