1. Pollen grains can be stored for several years in liquid nitrogen having a temperature of

1. –120°C
2. –80°C
3. –160°C
4. –196°C

Answer:

• –196°C

Pollen grains can be stored for several years in liquid nitrogen at –196°C (Cryopreservation)

2. Which of the following has proved helpful in preserving pollen as fossils?

1. Pollenkitt
2. Cellulosic intine
3. Sporopollenin
4. Oil content

Answer:

• Sporopollenin

Sporopollenin cannot be degraded by enzymes; strong acids and alkalis, therefore it is helpful in preserving pollen as a fossil.

3. Functional megaspore in an angiosperm develops into

1. Ovule
2. Endosperm
3. Embryo sac
4. Embryo

Answer:

• Embryo sac

4. Hormones secreted by the placenta to maintain pregnancy are

1. hCG, hPL, progestogens, prolactin
2. hCG, hPL, estrogens, relaxin, oxytocin
3. hCG, progestogens, estrogens, glucocorticoids
4. hCG, hPL, progestogens, estrogens

Answer:

• hCG, hPL, progestogens, estrogens

Placenta releases human chorionic gonadotropic hormone (hCG) which stimulates the Corpus luteum during pregnancy to release estrogen and progesterone and also rescues corpus luteum from regression. Human placental lactogen (hPL) is involved in growth of body of mother and breast. Progesterone maintains pregnancy, keeps the uterus silent by increasing uterine threshold to contractile stimuli.

5. A temporary endocrine gland in the human body is

1. Pineal gland
2. Corpus cardiacum
3. Corpus luteum
4. Corpus allatum

Answer:

• Corpus luteum

6. Several hormones like hCG, hPL, estrogen, progesterone are produced by

1. Ovary
2. Placenta
3. Fallopian tube
4. Pituitary

Answer:

• Placenta

Hormones secreted by placenta are hCG, hPL, estrogen and progesterone.

7. The contraceptive ‘SAHELI’

1. blocks estrogen receptors in the uterus, preventing eggs from getting implanted.
2. increases the concentration of estrogen and prevents ovulation in females.
3. is a post-coital contraceptive.
4. is an IUD.

Answer:

• blocks estrogen receptors in the uterus, preventing eggs from getting implanted.

Saheli is the first non-steroidal, once a week pill. It contains centchroman and its functioning is based upon selective Estrogen Receptor modulation.

8. The function of copper ions in copper releasing IUD’s is

1. They suppress sperm motility and fertilising capacity of sperms
2. They inhibit gametogenesis
3. They make uterus unsuitable for implantation
4. They inhibit ovulation

Answer:

• They suppress sperm motility and fertilising capacity of sperms

Cu2 interfere in the sperm movement, hence suppress the sperm motility and fertilising capacity of sperms.

9. Which of the following is hormone releasing IUD?

1. LNG-20
2. Multiload-375
3. Lippes loop
4. Cu7

Answer:

• LNG-20

LNG-20 (Levonorgestrel) is a hormone releasing IUDs.

10. Most common asexual structure produced in algae is

1. Thick walled
2. Multicellular
3. Flagellated
4. Produced in chains

Answer:

• Flagellated

Zoosperes possess flagella.

11. The term ‘clone’ cannot be applied to an offspring formed by sexual reproduction because

1. Offspring do not possess exact copies of parental DNA.
2. DNA of only one parent is copied and passed on to the offspring.
3. Offspring are formed at different times.
4. DNA of parent and offspring are completely different.

Answer:

• Offspring do not possess exact copies of parental DNA.

NCERT Class 12 Page No.5 ( 1.1 Para Last Line )

12. Amoeba and Yeast reproduce asexually by fission and budding respectively, because they are

1. Microscopic organisms
2. Heterotrophic organism
3. Unicellular organisms
4. Uninucleate organisms

Answer:

• Unicellular organisms

13. A multicellular, filamenteous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has

1. Haploid vegetative cells and diploid gametangia.
2. Diploid vegetative cells and diploid gametangia.
3. Diploid vegetative cells and haploid gametangia.
4. Haploid vegetative cells and haploid gametangia.

Answer:

• Diploid vegetative cells and haploid gametangia.

NCERT Class 12 Page No.7

14. The male gametes of rice plant have 12 chromosomes in their nucleus. The chromosome number in the female gamete, zygote and the cells of the seedling will be, respectively

1. 12, 24, 12
2. 24, 12, 12
3. 12, 24, 24
4. 24, 12, 24

Answer:

• 12, 24, 24

Chromosome number in male gamete of rice plant is n=12 therefore chromosome number in female gamete would also be 12.

Zygote is diploid as it is the product of fertilization and the cells of the seeding would be meiocytes and other diploid cells. Hence, the chromosome number in both zygote and cells of seeding will be 2n=24.

15. Appearance of vegetative propagules from the nodes of plants such as sugarcane and ginger is mainly because

1. Nodes are shorter than internodes
2. Nodes have meristematic cells
3. Nodes are located near the soil
4. Nodes have non-photosynthetic cells

Answer:

• Nodes have meristematic cells

16. Offspring formed by sexual reproduction exhibit more variation than those formed by asexual reproduction because

1. Sexual reproduction is a lengthy process.
2. Gametes of parents have qualitatively different genetic composition.
3. Genetic material comes from parents of two different genetic compositions.
4. Greater amount of DNA is involved in sexual reproduction.

Answer:

• Gametes of parents have qualitatively different genetic composition.

During sexual reproduction, fertilization creates a single-celled zygote which includes genetic material from both gametes. Therefore, the complex mixture of genetic material causes a great variation in the offspring.

17. Choose the correct statement from amongst the following:

1. Dioecious (hermaphrodite) organisms are seen only in animals.
2. Dioecious organisms are seen only in plants
3. Dioecious organisms are seen in both plants and animals.
4. Dioecious organisms are seen only in vertebrates.

Answer:

• Dioecious organisms are seen in both plants and animals.

NCERT Class 12 Page No.11

18. There is no natural death in single celled organisms like Amoeba and bacteria because

1. They cannot reproduce sexually.
2. They reproduce by binary fission.
3. Parental body is distributed among the offspring.
4. They are microscopic.

Answer:

• Parental body is distributed among the offspring.

NCERT Class 12 Page No.3 8th Line from Below

19. There are various types of reproduction. The type of reproduction adopted by an organism depends on

1. The habitat and morphology of the organism.
2. Morphology of the organism.
3. Morphology and physiology of the organism.
4. The organism’s habitat, physiology and genetic makeup.

Answer:

• The organism’s habitat, physiology and genetic makeup.

20. Which of the following is a post-fertilization event in flowering plants?

1. Transfer of pollen grains
2. Embryo development
3. Formation of flower
4. Formation of pollen grains

Answer:

• Embryo development

NCERT Class 12 Page No.15 & 16

21. Embryo sac is to ovule as ________ is to an anther.

1. Stamen
2. Filament
3. Pollen grain
4. Androecium

Answer:

• Pollen grain

22. In a typical, complete, bisexual and hypogynous flower, the arrangement of floral whorls on the thalamus from the outermost to the innermost is

1. Calyx, corolla, androecium and gynoecium
2. Calyx, corolla, gynoecium and androecium
3. Gynoecium, androecium, corolla and calyx
4. Androecium, gynoecium, corolla and calyx

Answer:

• Calyx, corolla, androecium and gynoecium

23. A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the above situation is

1. The plant is dioecious and bears only pistillate flowers
2. The plant is dioecious and bears both pistillate and staminate flowers
3. The plant is monoecious.
4. The plant is dioecious and bears only staminate flowers.

Answer:

• The plant is dioecious and bears only staminate flowers.

Fruits can develop from a single ovary of a single flower(simple fruit) or from several free carpels of a single flower (aggregate) or form whole inflorescence(multiple). In total, fruits develop from ovaries. This is why, a dioecious plant (unisexual) bearing only staminate (male) flowers will not produce fruits, whereas monoecious plants (bisexual) or dioecious plants bearing only pistillate (female) lowers or pistillate and staminate both can bear fruits.

24. The outermost and innermost wall layers of microsporangium in an anther are respectively

1. Endothecium and tapetum
2. Epidermis and endodermis
3. Epidermis and middle layer
4. Epidermis and tapetum

Answer:

• Epidermis and tapetum

NCERT Class 12 Page No.22 (Figure 2.3 b)

25. During microsporogenesis, meiosis occurs in

1. Endothecium
2. Microspore mother cells
3. Microspore tetrads
4. Pollen grains

Answer:

• Microspore mother cells

NCERT Class 12 Page No.22 (1st Para 3 to 5 Line from Above)

26. From among the sets of terms given below, identify those that are associated with the gynoecium.

1. Stigma, ovule, embryo sac, placenta
2. Thalamus, pistil, style, ovule
3. Ovule, ovary, embryo sac, tapetum
4. Ovule, stamen, ovary, embryo sac

Answer:

• Stigma, ovule, embryo sac, placenta

27. Starting from the innermost part, the correct sequence of parts in an ovule are

1. Egg, nucellus, embryo sac, integument
2. Egg, embryo sac, nucellus, integument
3. Embryo sac, nucellus, integument, egg
4. Egg, integument, embryo sac, nucellus

Answer:

• Egg, embryo sac, nucellus, integument

NCERT Class 12 Page No.25 (Figure 2.7 d)

28. Autogamy can occur in a chasmogamous flower if

1. Pollen matures before the maturity of ovule.
2. Ovules mature before the maturity of pollen.
3. Both pollen and ovules mature simultaneously.
4. Both anther and stigma are of equal lengths.

Answer:

• Both pollen and ovules mature simultaneously.

NCERT Class 12 Page No.28

29. The phenomenon wherein, the ovary develops into a fruit without fertilization is called

1. Parthenocarpy
2. Apomixis
3. Asexual reproduction
4. Sexual reproduction

Answer:

• Parthenocarpy

NCERT Class 12 Page No.37 (1st Para Below Fig 2.15)

30. In an embryo sac, the cells that degenerate after fertilization are

1. Synergid and primary endosperm nucleus cell
2. Egg and antipodals
3. Antipodal and primary endosperm nucleus cell
4. Synergid and antipodal

Answer:

• Synergid and antipodal

NCERT Class 12 Page No.27 & Figure 2.8 (Please Read carefully this topic and Diagram)

31. Choose the incorrect statement from the following:

1. In birds and mammals internal fertilization takes place.
2. Colostrum contains antibodies and nutrients.
3. Polyspermy in mammals is prevented by the chemical changes in the egg surface.
4. In humans, female implantation occurs almost seven days after fertilization.

Answer:

• Polyspermy in mammals is prevented by the chemical changes in the egg surface.

Internal fertilization is a type of fertilization in which there is union of an egg and sperm inside the body of a parent. Examples include reptiles, mammals, birds. Colostrum is the first form of milk that is produced by the mammary glands of mammals. It contains large numbers of IgA antibodies and lymphocytes that help protect the mucous membranes of the infant. Polyspermy is a condition in which egg has been fertilized by more than one sperm. It is prevented by depolarization of the egg plasma membrane after the entry of first sperm. This depolarization prevents the entry of additional sperms. The fertilized ovum enters the uterine cavity 3-4 days later. Implantation occurs almost 7 to 10 days after fertilization and 5 to 6 days after it has entered the uterine cavity.
Thus, the correct answer is ‘Polyspermy is prevented by the chemical changes on the egg surface..

32. Identify the correct statement from the following:

1. High levels of oestrogen triggers the ovulatory surge.
2. Oogonial cells start to proliferate and give rise to functional ova in regular cycles from puberty onwards.
3. Sperms released from seminiferous tubules are highly motile.
4. Progesterone level is high during the post ovulatory phase of menstrual cycle.

Answer:

• Progesterone level is high during the post ovulatory phase of menstrual cycle.

NCERT Class 12 Page No. 50 ( Figure 3.9 )

33. Spot the odd one out from the following structures with reference to the male reproductive system.

1. Rete testis
2. Epididymis
3. Vasa efferentia
4. Isthmus

Answer:

• Isthmus

34. Spermiation is the process of the release of sperms from

1. Seminiferous tubules
2. Vas deferens
3. Epididymis
4. Prostate gland

Answer:

• Seminiferous tubules

NCERT Class 12 Page No.47 (3.3 1st Para 3rd Line from Below)

35. Mature Graafian follicle is generally present in the ovary of a healthy human female around

1. 5 to 8 days of menstrual cycle
2. 11 to 17 days of menstrual cycle
3. 18 to 23 days of menstrual cycle
4. 24 to 28 days of menstrual cycle

Answer:

• 11 to 17 days of menstrual cycle

Nice Questions extracted from NCERT Class 12 Page No.49 & 50 (Figure 3.9).

Those who did correct Your Reading skill of NCERT Book is Nice. Keep it up

36. Acrosomal reaction of the sperm occurs due to

1. Its contact with zona pellucida of the ova.
2. Reactions within the uterine environment of the female.
3. Reactions within the epididymal environment of the male.
4. Androgens produced in the uterus.

Answer:

• Its contact with zona pellucida of the ova.

37. Which one of the following is not a male accessory gland?

1. Seminal vesicle
2. Ampulla
3. Prostate
4. Bulbourethral gland

Answer:

• Ampulla

NCERT Class 12 Page No. 45 & 46

Infundibulum leads to a wider part of Oviduct called Ampulla.

38. Which among the following has 23 chromosomes?

1. Spermatogonia
2. Zygote
3. Secondary oocyte
4. Oogonia

Answer:

• Secondary oocyte

NCERT Class 12 Page No.49 (Figure 3.8)

Please understand this Figure You can make atleast 4-6 Questions from this Figure Only

39. Which of the following hormones is not secreted by human placenta?

1. hCG
2. Oestrogens
3. Progesterone
4. LH

Answer:

• LH

NCERT Class 12 Page No.53 (2nd Para 5th line to END)

40. The vas deferens receives duct from the seminal vesicle and opens into urethra as

1. Epididymis
2. Ejaculatory duct
3. Efferent ductule
4. Ureter

Answer:

• Ejaculatory duct

NCERT Class 12 Page No.43 (2nd Para 6th Line)

41. Morula is a developmental stage

1. Between the zygote and blastocyst
2. Between the blastocyst and gastrula
3. After the implantation
4. Between implantation and parturition

Answer:

• Between the zygote and blastocyst

NCERT Class 12 Page No.53 First Paragraph

42. The membranous cover of the ovum at ovulation is

1. Corona radiata
2. Zona radiata
3. Zona pellucida
4. Chorion

Answer:

• Corona radiata

NCERT Class 12 Page No.51 (Figure 3.10)

43. The method of directly injecting a sperm into ovum is assisted by a reproductive technology called

1. GIFT
2. ZIFT
3. ICSI
4. ET

Answer:

• ICSI

NCERT Class 12 Page No.64 (3rd Para 5th Line)

44. Intensely lactating mothers do not generally conceive due to the

1. Suppression of gonadotropins
2. Hypersecretion of gonadotropins
3. Suppression of gametic transport
4. suppression of fertilization

Answer:

• Suppression of gonadotropins

Presence of prolactin hormone in the blood of lactating mothers suppresses the release of gonadotropins (FSH and LH) from the pituitary gland. Gonadotropins are required for ovulation to occur. Thus, in the absence of gonadotropins, ovum is not released and hence chances of fertilisation are nil upto 6 months

45. A national level approach to build up a reproductively healthy society was taken up in our country during

1. 1950s
2. 1960s
3. 1970s
4. 1980s

Answer:

• 1960s

NCERT Class 12 Page No.57 (family planning were initiated in 1951)

46. Emergency contraceptives are effective if used within

1. 72 hours of coitus
2. 72 hours of ovulation
3. 72 hours of menstruation
4. 72 hours of implantation

Answer:

• 72 hours of coitus

NCERT Class 12 Page No.61 (3rd Para 4th Line)

47. Choose the right one among the statements given below:

1. IUDs are generally inserted by the user herself.
2. IUDs increase phagocytosis reaction in the uterus.
3. IUDs suppress gametogenesis.
4. IUDs once inserted need not be replaced.

Answer:

• IUDs increase phagocytosis reaction in the uterus.

NCERT Class 12 Page No.60 (Last Para 3rd Line from Below)

48. From the sexually transmitted diseases mentioned below, identify the one which does not specifically affect the sex organs.

1. Syphilis
2. AIDS
3. Gonorrhoea
4. Genital warts

Answer:

• AIDS

NCERT Class 12 Page No.155 & 156

49. The correct surgical procedure as a contraceptive method is

1. Vasectomy
2. Castration
3. Hysterectomy
4. Ovariectomy

Answer:

• Vasectomy

50. LNG-20 is a

1. Oral contraceptive
2. Natural contraceptive
3. Hormonal IUD
4. Cu releasing IUD

Answer:

• Hormonal IUD

NCERT Class 12 Page No.60 (Last Para 3rd line from below)

Reproduction is the process by which organisms produce new individuals of their own kind. It is a fundamental process that ensures the continuation of life. There are two main types of reproduction: asexual and sexual.

Asexual reproduction is the process in which a new individual is produced from a single parent without the involvement of gametes or fertilization. It is a rapid and efficient way to produce offspring, but it does not allow for much genetic variation. Examples of asexual reproduction include budding, fission, and vegetative propagation.

Reproduction In Organisms NEET MCQ 2024

Sexual reproduction is the process in which a new individual is produced from the fusion of two gametes from two different parents. This process allows for a greater degree of genetic variation, which can be beneficial for the population in the long term. Examples of sexual reproduction include fertilization, conjugation, and meiosis.

Reproduction in organisms is a complex and fascinating process. It is essential for the survival of all species, and it is a key factor in evolution.

Here are some important NEET MCQ concepts on reproduction in organisms:

• Asexual reproduction:
  • Budding
  • Fission
  • Vegetative propagation
• Sexual reproduction:
  • Fertilization
  • Conjugation
  • Meiosis
• Other important concepts:
  • Gametes
  • Zygote
  • Embryo
  • Offspring
  • Genetic variation

Disclaimer:

onlinepadhaikro.com does not own this book/materials, We provide the links which are already available on the internet. For any quarries, a disclaimer is requested to kindly contact us – onlinepadhaikro.com@gmail.com or https://onlinepadhaikro.com/contact-us this copy was provided for students who are financially troubled but deserving to learn to thank you

We don’t support piracy this copy was provided for students who are financially poor but deserve more to learn. Thank you