Unit 6: Reproduction — Online MCQ Test
BIOLOGY · NEET (All) · NEET
Practice Unit 6: Reproduction with a free chapter-wise online MCQ test.
This chapter covers: Sexual reproduction in flowering plants: Flower structure; Development of male and female gametophytes; Pollination-types agencies and examples; Outbreeding devices; Pollen-Pistil....
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Unit 6: Reproduction — Important Questions & Answers
Meiotic division of the secondary oocyte is completed:
- A. At the time of copulation
- B. After zygote formation
- C. At the time of fusion of a sperm with an ovum
- D. Prior to ovulation
Answer: C. At the time of fusion of a sperm with an ovum
The second meiotic division in the secondary oocyte is triggered to complete only when a sperm penetrates the zona pellucida during fertilization.
The second meiotic division in the secondary oocyte is triggered to complete only when a sperm penetrates the zona pellucida during fertilization.
In which of the following techniques, the embryos are transferred to assist those females who cannot conceive?
- A. GIFT and ZIFT
- B. ICSI and ZIFT
- C. GIFT and ICSI
- D. ZIFT and IUT
Answer: D. ZIFT and IUT
ZIFT (Zygote Intra Fallopian Transfer) and IUT (Intra Uterine Transfer) are techniques where the embryo is transferred into the female body.
ZIFT (Zygote Intra Fallopian Transfer) and IUT (Intra Uterine Transfer) are techniques where the embryo is transferred into the female body.
Match the following columns and select the correct option. Column I: (a) Placenta, (b) Zona pellucida, (c) Bulbo-urethral glands, (d) Leydig cells Column II: (i) Androgens, (ii) Human Chorionic Gonadotropin (hCG), (iii) Layer of the ovum, (iv) Lubrication of the Penis
- A. (1) (i) (iv) (ii) (iii)
- B. (2) (iii) (ii) (iv) (i)
- C. (3) (ii) (iii) (iv) (i)
- D. (4) (iv) (iii) (i) (ii)
Answer: C. (3) (ii) (iii) (iv) (i)
Placenta produces hCG (ii), Zona pellucida is the layer of the ovum (iii), Bulbo-urethral glands provide lubrication to the penis (iv), and Leydig cells produce androgens (i).
Placenta produces hCG (ii), Zona pellucida is the layer of the ovum (iii), Bulbo-urethral glands provide lubrication to the penis (iv), and Leydig cells produce androgens (i).
What are the potential drawbacks in adoption of the IVF method? A. High fatality risk to mother B. Expensive instruments and reagents C. Husband/wife necessary for being donors D. Less adoption of orphans E. Not available in India F. Possibility that the early embryo does not survive Choose the correct answer from the options given below:
- A. B, D, F only.
- B. A, C, D, F only
- C. A, B, C, D only
- D. A, B, C, E, F only
Answer: A. B, D, F only.
NCERT highlights that IVF is expensive, requires specialized skills, and involves social issues like the availability of embryos or adoption concerns.
NCERT highlights that IVF is expensive, requires specialized skills, and involves social issues like the availability of embryos or adoption concerns.
Given below are two statement: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Both wind and water pollinated flowers are not very colourful and do not produce nectar. Reason (R): The flowers produce enormous amount of pollen grains in wind and water pollinated flowers. In the light of the above statements, choose the correct answer from the options given below:
- A. Both A and R are true and R is the correct explanation of A.
- B. Both A and R are true but R is NOT the correct explanation of A.
- C. A is true but R is false.
- D. A is false but R is true.
Answer: B. Both A and R are true but R is NOT the correct explanation of A.
Both statements are correct (non-colourful and nectarless flowers are typical for wind/water pollination, and they produce copious pollen). However, the reason for being non-colourful is that they do not need to attract biotic pollinators, while the reason for high pollen count is to compensate for the high probability of wastage.
Both statements are correct (non-colourful and nectarless flowers are typical for wind/water pollination, and they produce copious pollen). However, the reason for being non-colourful is that they do not need to attract biotic pollinators, while the reason for high pollen count is to compensate for the high probability of wastage.
Match List-I with List-II.
- A. A. Head I. Enzymes; B. Middle piece II. Sperm motility; C. Acrosome III. Energy; D. Tail IV. Genetic material
- B. A. Head IV. Genetic material; B. Middle piece III. Energy; C. Acrosome I. Enzymes; D. Tail II. Sperm motility
- C. A. Head III. Energy; B. Middle piece IV. Genetic material; C. Acrosome II. Sperm motility; D. Tail I. Enzymes
- D. A. Head III. Energy; B. Middle piece II. Sperm motility; C. Acrosome I. Enzymes; D. Tail IV. Genetic material
Answer: A. A. Head I. Enzymes; B. Middle piece II. Sperm motility; C. Acrosome III. Energy; D. Tail IV. Genetic material
Head contains genetic material (nucleus), Acrosome contains enzymes (hyaluronidase), Middle piece contains mitochondria providing energy, Tail provides sperm motility.
Head contains genetic material (nucleus), Acrosome contains enzymes (hyaluronidase), Middle piece contains mitochondria providing energy, Tail provides sperm motility.
The first menstruation is called:
- A. Menopause
- B. Menarche
- C. Diapause
- D. Ovulation
Answer: B. Menarche
The first onset of menstruation at puberty is termed menarche.
The first onset of menstruation at puberty is termed menarche.
Attractants and rewards are required for
- A. Cleistogamy
- B. Anemophily
- C. Entomophily
- D. Hydrophily
Answer: C. Entomophily
Entomophily (insect pollination) requires floral rewards like nectar and pollen, and visual/scent attractants to encourage pollinators to visit.
Entomophily (insect pollination) requires floral rewards like nectar and pollen, and visual/scent attractants to encourage pollinators to visit.
The amnion of mammalian embryo is derived from
- A. ectoderm and mesoderm
- B. ectoderm and endoderm
- C. mesoderm and trophoblast
- D. endoderm and mesoderm
Answer: A. ectoderm and mesoderm
The amnion is an extra-embryonic membrane derived from ectoderm (inner layer) and somatic mesoderm (outer layer). It forms the amniotic sac filled with amniotic fluid that protects the embryo.
The amnion is an extra-embryonic membrane derived from ectoderm (inner layer) and somatic mesoderm (outer layer). It forms the amniotic sac filled with amniotic fluid that protects the embryo.
Hormones secreted by the placenta to maintain pregnancy are
- A. hCG, hPL, estrogens, relaxin, oxytocin
- B. hCG, hPL, progestogens, estrogens
- C. hCG, hPL, progestogens, prolactin
- D. hCG, progestogens, estrogens, glucocorticoids
Answer: B. hCG, hPL, progestogens, estrogens
The placenta is an endocrine organ that secretes several hormones to maintain pregnancy: human chorionic gonadotropin (hCG), human placental lactogen (hPL), estrogens, and progestogens. Oxytocin is secreted by the posterior pituitary, prolactin by anterior pituitary, and glucocorticoids by the adrenal cortex — not by the placenta.
The placenta is an endocrine organ that secretes several hormones to maintain pregnancy: human chorionic gonadotropin (hCG), human placental lactogen (hPL), estrogens, and progestogens. Oxytocin is secreted by the posterior pituitary, prolactin by anterior pituitary, and glucocorticoids by the adrenal cortex — not by the placenta.