NEET Biology · Flashcards
This deck has 20 flashcards on Reproduction for NEET Biology, from NCERT Class 12. It covers the NCERT chapters Sexual Reproduction in Flowering Plants, Human Reproduction and Reproductive Health.
Covering plant reproductive strategies, human reproductive physiology, and essential concepts in reproductive health and assisted technologies.
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Card 1 of 20
What is the result of 'Double Fertilization' in angiosperms?
Hint: Syngamy + Triple Fusion = Double Fertilization.
Answer
It results in the formation of a diploid zygote (syngamy) and a triploid primary endosperm nucleus (triple fusion).
Card 2 of 20
What are 'Outbreeding devices' and why do plants evolve them?
Hint: Plants want to avoid inbreeding depression.
Answer
Mechanisms like dioecy, self-incompatibility, and heterostyly that discourage self-pollination and promote cross-pollination to increase genetic diversity.
Card 3 of 20
Differentiate between Apomixis and Parthenocarpy.
Hint: Apomixis = seed but no sex; Parthenocarpy = fruit but no seed.
Answer
Apomixis: Seed production without fertilization (asexual reproduction mimicking sexual). Parthenocarpy: Fruit formation without fertilization (fruit is seedless).
Card 4 of 20
What is the function of the Sertoli cells found in the seminiferous tubules?
Hint: Think of them as 'nurse cells' for sperm.
Answer
They provide nutrition to the developing germ cells (spermatids) and secrete androgen-binding protein (ABP) and Inhibin.
Card 5 of 20
What triggers the completion of Meiosis II in the secondary oocyte?
Hint: Without fertilization, it remains arrested in Metaphase II.
Answer
The entry of the sperm into the cytoplasm of the secondary oocyte during fertilization.
Card 6 of 20
What is the structural composition and primary function of the placenta?
Hint: It also acts as an endocrine tissue secreting hCG, hPL, estrogen, and progesterone.
Answer
The placenta is a structural and functional unit between the fetus and maternal body. It facilitates the supply of and nutrients to the fetus and the removal of and excretory wastes.
Card 7 of 20
What are the common side effects of hormonal contraceptive pills and their mode of action?
Hint: Side effects include nausea, breast tenderness, and mood changes.
Answer
They contain synthetic progesterone or estrogen-progesterone combinations. They inhibit ovulation and implantation, and alter the quality of cervical mucus to prevent sperm entry.
Card 8 of 20
What is the difference between ZIFT and GIFT assisted reproductive technologies?
Hint: ZIFT = Zygote; GIFT = Gamete.
Answer
ZIFT (Zygote Intra-Fallopian Transfer): Zygote (formed via IVF) is transferred into the Fallopian tube. GIFT (Gamete Intra-Fallopian Transfer): Ovum collected from a donor is transferred into the Fallopian tube of another female who cannot produce eggs.
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