CBSE Class 12 Biology Human Reproduction VBQs

Question. Pouch in which testes are suspended outside the abdominal cavity, is
(a) tunica albuginea
(b) inguinal canal
(c) epididymis
(d) scrotum
Answer. D

Question. Function of scrotum is to maintain the
(a) temperature of testes
(b) body temperature
(c) level of growth hormone
(d) level of male hormone
Answer. A

Question. Approximate length and width of testis are
(a) 4-5 cm and 2-3 cm
(b) 5-6 cm and 3-4 cm
(c) 6-7 cm and 4-5 cm
(d) 7-8 cm and 8-9 cm
Answer. A

Question. How many compartments (approximately) are there in each human testis?
(a) 250
(b) 300
(c) 350
(d) 400
Answer. A

Question. Compartments in mammalian testes are called
(a) testicular lobules
(b) seminiferous tubules
(c) Sertoli cells
(d) interstitial cells
Answer. A

Question. Testicular lobules contain
(a) 3-5 seminiferous tubules
(b) 2-6 seminiferous tubules
(c) 5-7 seminiferous tubules
(d) 1-3 seminiferous tubules
Answer. D

Question. The seminiferous tubules of the testis is lined on its inside by
(a) spermatocytes
(b) spermatogonia
(c) cells of Sertoli
(d) Both (b) and (c)
Answer. D

Question. ……… provide nutrition to the male germ cells.
(a) Interstitial cells
(b) Leydig cells
(c) Sertoli cells
(d) Both (a) and (b)
Answer. C

Question. Which of the following cells present in the mammalian testes forms the sperms?
(a) Leydig cells
(b) Spermatogonia
(c) Interstitial cells
(d) Sertoli cells
Answer. B

Question. Region outside the seminiferous tubules is called
(a) interdigital space
(b) interferous space
(c) interstitial space
(d) blind space
Answer. C

Question. The seminiferous tubules of the testis open into the vasa efferentia by
(a) vasa deferentia
(b) rete testis
(c) epididymis
(d) seminiferous tubules
Answer. B

Question. Select the correct sequence for transport of sperm cells in male reproductive system.
(a) Seminiferous tubules→ Rete testis→ Vasa efferentia→ Epididymis→ Vas deferens→ Ejaculatory duct→Urethra→ Urethral meatus
(b) Seminiferous tubules→ Vasa efferentia→ Epididymis→ Inguinal canal→ Urethra
(c) Testis→ Epididymis→ Vasa efferentia→ Vasdeferens→ Ejaculatory duct→ Inguinal canal→Urethra→ Urethral meatus
(d) Testis→ Epididymis→ Vasa efferentia→ Rete testis→ Inguinal canal→ Urethra
Answer. A

Question. Choose the incorrect pair.
(a) Leydig cells — Secrete testicular hormone
(b) Vasa efferentia and epididymis — Accessory ducts
(c) Vas deferens — Loops over the urinary bladder
(d) Ejaculatory duct — Vasa efferentia and seminal vesicle
Answer. D

Question. Choose the correct option.

(a) A– Testis–possesses 3-4 testicular lobule
(b) B– Seminal vesicle–storage of sperm
(c) C– Vas deferens–helps in sperm transfer
(d) D– Prostate gland–secretes seminal fluid
Answer. C

Question. The shared terminal duct of the reproductive and urinary system in the human male is
(a) urethra
(b) ureter
(c) vas deferens
(d) vasa efferentia
Answer. A

Question. Identify the accessory glands found in males.
(a) Seminal vesicles
(b) Prostate gland
(c) Bulbourethral gland
(d) All of these
Answer. B

Female Reproductive System

Question. The ovaries are located one on each side of the…A….
Each ovary is about 2-4 cm in length connected to the …B… wall by …C… . Each ovary is covered by a thin epithelium which encloses the ovarian stroma.Stroma is divided into two zones …D… and …E… .
Fill the suitable choices for A-E.
(a) A–inner medulla, B–peripheral cortex, C–ligaments,D–pelvic wall, E-lower abdomen
(b) A–lower abdomen B–pelvic, C–ligaments,D–peripheral cortex, E–inner medulla
(c) A–pelvic wall, B–lower abdomen, C–ligaments,D–inner medulla, E–peripheral cortex
(d) A–inner medulla, B–peripheral cortex, C–lower abdomen, D–pelvic wall, E–ligaments
Answer.B

Question. The following diagram refers to female reproductive system of human. Identify A to E.

(a) A–Urethra, B–Urinary bladder, C–Uterus, D–Cervix, E–Vagina
(b) A–Urethra, B–Urinary bladder, C–Uterus, D–Vagina, E–Cervix
(c) A–Urethra, B–Urinary bladder, C–Uterus, D–Cervix, E–Vagina
(d) A–Uterus, B–Urinary bladder, C–Urethra, D–Cervix, E–Vagina
Answer.D

Question. Oviducts are also called
(a) Fallopian tubes
(b) uterus
(c) vagina
(d) ovary
Answer.A

Question. Human Fallopian tube is about
(a) 8-9 cm long
(b) 9-10 cm long
(c) 10-12 cm long
(d) 12-17 cm long
Answer.C

Question. Funnel-shaped part of oviduct closer to the ovary is called
(a) fimbriae
(b) infundibulum
(c) ampulla
(d) isthmus
Answer.B

Question. Fimbriae are associated with which organ?
(a) Fallopian tube
(b) Uterus 
(c) Vagina
(d) Ovary
Answer.A

Question. The main function of fimbriae of Fallopian tube is
(a) help in development of ovary
(b) help in collection of the ovum after ovulation
(c) help in development of ova
(d) help in fertilisation
Answer.B

Question. Choose the incorrect pair.
(a) Finger-like projections – Fimbriae
(b) Narrow part of oviduct – Ampulla
(c) Part of oviduct joining the uterus – Isthmus
(d) None of the above
Answer.B

Question. The following diagram refers to the female reproductive system of humans. Identify A-F.

(a) A–Ampulla, B–Isthmus, C–Infundibulum, D–Fallopian tube, E–Ovary, F–Uterine fundus
(b) A–Isthmus, B–Infundibulum, C–Ampulla, D–Fallopian tube, E–Ovary, F–Uterine fundus
(c) A–Isthmus, B–Ampulla, C–Infundibulum, D–Fallopian tube, E–Ovary, F–Uterine fundus
(d) A–Ampulla, B–Infundibulum, C–Isthmus, D–Fallopian tube, E–Ovary, F–Uterine fundus
Answer.C

Question. Choose the incorrect pair.
(a) Cushion of fatty tissue covered by pubic hair –Mons pubis
(b) Membrane covering opening of vagina–Hymen
(c) Finger-like structure above the urethral opening –Clitoris
(d) Uterine layer exhibiting strong contraction during delivery–Endometrium
Answer.D

Question. The main tissue present in breast is ……… tissue.
(a) glandular
(b) squamous
(c) ciliated
(d) epithelium
Answer.A

Question. Given the diagrammatic sectional view of mammary gland. Identify A, B, C and D.

(a) A–Alveolus, B–Mammary duct, C–Lactiferous duct,D–Areola
(b) A–Alveolus, B–Lactiferous duct, C–Mammary duct,D–Areola
(c) A–Alveolus, B–Mammary duct, C–Lactiferous duct,D–Lactogenic spot
(d) A–Fat, B–Mammary duct, C–Lactiferous duct,D–Areola
Answer.D

Question. Several mammary ducts join to form a wider mammary ampulla, which is connected to
(a) lactiferous duct
(b) seminiferous duct
(c) seminiferous tubules
(d) nipple
Answer.A

Question. Pick the odd one out from each series given below and select the correct option.
I. Scrotum, rete testis, Fallopian tube, vas deferens.
II. Ovary, uterus, vagina, ejaculatory duct.
III. Acrosome, Graafian follicle, corpus luteum, cervix.
IV. Prostate, testis, seminal vesicles, Cowper’s gland.

Answer.D

Question. A sectional view of mammary gland shows
I. nipple and areola.
II. mammarylobes (alveolus) and duct.
III. ribs.
IV. ampulla and lactiferous duct.
Choose the correct option from the above.
(a) I, II, III and IV
(b) I, II and III
(c) III, IV and II
(d) I, IV and III
Answer.A

Gametogenesis

Question. Number of chromosomes present in spermatogonium is 
(a) 46
(b) 23
(c) 48
(d) 43
Answer.A

Question. Which cells come earliest in the sequence of sperm production?
(a) Spermatozoa
(b) Spermatocyte
(c) Spermatid
(d) Spermatogonia
Answer.D

Question. Which of the following undergoes meiosis-I division during spermatogenesis?
(a) Primary spermatocytes
(b) Secondary spermatocytes
(c) Sertoli cell
(d) Leydig cell
Answer.A

Question. Number of chromosomes present in secondary spermatocyte is JIPMER 2019
(a) 22
(b) 23
(c) 24
(d) 25
Answer.B

Question. Which one of the following cells have haploid number of chromosome?
(a) Primary spermatocytes
(b) Secondary spermatocytes
(c) Spermatid
(d) Both (b) and (c)
Answer.D

Question. During spermatogenesis, which cells are the first to contain haploid number of chromosomes?
(a) Spermatogonium
(b) Primary spermatocyte
(c) Secondary spermatocyte
(d) Spermatid
Answer.C

Question. Find out spermatid and Sertoli cell in given below diagram.

(a) D and E
(b) E and F
(c) A and C
(d) B and E
Answer.D

Question. Spermiogenesis is
(a) spermatids transformed into spermatozoa
(b) spermatozoa transformed into spermatids
(c) spermatozoa transformed to spermatocytes
(d) spermatid to secondary spermatocytes
Answer.A

Question. What is the correct sequence of sperm formation?
(a) Spermatid, Spermatocyte, Spermatogonia, Spermatozoa
(b) Spermatogonia, Spermatocyte, Spermatozoa, Spermatid
(c) Spermatogonia, Spermatozoa, Spermatocyte, Spermatid
(d) Spermatogonia, Spermatocyte, Spermatid, Spermatozoa
Answer.D

Question. The difference between spermiogenesis and spermiation is 
(a) in spermiogenesis, spermatozoa from Sertoli cells are released into the cavity of seminiferous tubules, while in spermiation, spermatozoa are formed
(b) in spermiogenesis, spermatozoa are formed, while in spermiation, spermatids are formed
(c) in spermiogenesis, spermatids are formed, while in spermiation, spermatozoa are formed
(d) in spermiogenesis, spermatozoa are formed, while in spermiation, spermatozoa are released through seminiferous tubules
Answer.D

Question. Spermatogenesis starts at puberty due to significant increase in the secretion of
(a) GnRH
(b) prolactin
(c) testosterone
(d) oestrogen
Answer.A

Question. GnRH, a hypothalamic hormone, needed in reproduction, acts on 
(a) anterior pituitary gland and stimulates secretion of LH and oxytocin
(b) anterior pituitary gland and stimulates secretion of LH and FSH
(c) posterior pituitary gland and stimulates secretion of oxytocin and FSH
(d) posterior pituitary gland and stimulates secretion of LH and relaxin
Answer.B

Question. Sperms of mammals depend for movement on
(a) only tail
(b) tail and middle piece
(c) middle piece
(d) Only head
Answer.B

Question. Choose the incorrect pair.
(a) Acrosome – Enzyme filled cap structure on sperm head
(b) Middle piece – Possesses numerous mitochondria
(c) Sperm tail – Facilitates sperm motility essential for fertilisation
(d) Semen – Contains only sperms
Answer.D

Question. Choose the incorrect pair.
(a) Antrum – Fluid-filled cavity in primary follicle
(b) Tertiary follicle – Primary oocyte completes its Ist meiotic division inside it
(c) Secondary oocyte – Haploid cell formed after Ist meiotic division
(d) Graafian follicle – Mature tertiary follicle which ruptures during ovulation
Answer.A

Question. The new membrane formed by follicular cells in secondary oocyte is called
(a) zona granulosa
(b) zona pellucida
(c) plasma membrane
(d) tertiary membrane
Answer.B

Question. Which of the following layers in an antral follicle is acellular? 
(a) Granulosa
(b) Theca interna
(c) Stroma
(d) Zona pellucida
Answer.D

Question. At which stage of the development, ovum is released from the ovary of the human female?
(a) Primary oocyte
(b) Oogonium
(c) Secondary oocyte
(d) Ootid
Answer.C

Question. Mark the wrong item in each series and select the correct option.
I. Spermatocyte, polar body, spermatid,spermatogonium
II. Endometrium, corpus luteum, acrosome, Graafian follicle
III. Vas deferens, Fallopian tube, epididymis, Cowper’s gland
IV. Testes, prostate, seminal vesicles, Cowper’s gland
         I                               II                    III                            IV
(a) Spermatid             Endometrium      Epididymis                Prostate
(b) Polar body            Acrosome            Fallopian tube           Testes
(c) Spermatocyte        Corpus luteum    Vas deferens             Cowper’s gland
(d) Spermatogonium   Graafian follicle   Cowper’s gland         Seminal vesicles
Answer.B

UNIT – X ECOLOGY

1. - Consider the following two cases:

Case I - A forest that is rich in biodiversity sees a decline in the animal population. The Government declared it as a biodiversity hotspot and the forest regained its species richness in few years.

Case II - A lake that is rich in marine fishes sees a decline in its species population due to over exploitation. One wise man in the area decided to worship the lake. The species population of the lake again became normal.

Answer the following questions based on the above information:

(i) Which values are being promoted in the above cases?
(ii) Suggest some ways in which you can contribute to this concern.
(iii) What would have been the effect is the forest was not declared a biodiversity hotspot?
Answer :  (i) Biodiversity conservation, ecosystem protection.

(ii) Educate people of the harm of biodiversity loss/persuade Government agencies to protect areas under danger.

(iii) The forest would have been destroyed completely and many species of plants and animals would have been lost forever.

Question. - Raman lives in a coastal village. He is the son of a fisherman. Whenever any unwanted animal comes in the net, instead of killing it, he puts it back in the sea.
Answer the following questions based on above information:
i. What would have happened, had he killed those animals?
ii. Give one reason to justify that Raman’s action is environment friendly.
iii. How can you contribute in the preservation of flora and fauna around you? Mention any two steps.
Answer : i. It would have contributed in disturbing the ecological balance.
ii. He is aware of conserving biodiversity.
iii. Creating sensitivity, by not using products derived from animals, by spreading awareness in other community members about the importance of biodiversity, by developing empathy and love for all living organisms. 

Question. - A debate was conducted in school on the need to conserve biodiversity. One student felt that there are so many species on earth, why will it matter if we lose a few. Do you feel the same? Justify your answer. 
Answer :  It is definitely a matter of concern when species become extinct from earth due to human activities. We are losing species more quickly than normal evolutionary processes can replace. Once a species becomes extinct, its role in its ecosystem is eliminated, leaving a void and weakening ecosystem function and services.

Question. Ravi and Shyam are neighbours. Both of them decided to buy cars. Ravi opted for a car that runs on CNG whereas Shyam opted for a car that runs on petrol. Ravi enjoys planting trees around his house and along the roadside whereas Shyam does not have interest in growing trees. He even cuts them for making a fire but does not replant them. Answer the following questions based on the above information: 
(i) Which of the two is good citizen? Which value is being promoted by him?
(ii) What advice would you like to give the other person?
Answer : (i) Ravi is sensitive to the environment and has concern for the environment and would like to control air pollution. Since CNG is cheaper than petrol, it is better to buy a vehicle that runs on CNG rather than petrol. (ii) When you cut trees, they should be replaced by replanting. 

Question. The number of dengue cases had increased in Raman’s village in the last one year. He read in his textbook that diseases like dengue spread through mosquitoes which breed in stagnant water. He immediately suggested to his friends and decided to kill the mosquitoes in water bodies in the locality. They also took help of nearest municipal office.
Answer the following questions based on above information:
i. Which preventive measures do you suggest for the prevention of such diseases caused by mosquitoes? Mention any two measures.
ii. Which values are displayed by Raman in taking initiative?
iii. Suggest one school activity to promote such values in school students.
Answer : i. Avoid water logging, proper and regular disinfection, use of mosquito net and repellents.
ii. Community Service, Social Responsibility, Environmental protection, Awareness of healthy living conditions
iii. Organising campaigns for creating awareness amongst masses, Organising debates, arranging similar community service. Group discussion 

Question. There is fear amongst the community in an area where a nuclear reactor is being installed. Rakesh is a college student and gives repeated demonstrations using a bomb calorimeter to show how experiments are conducted safely. What values are exhibited by Rakesh? 
Answer :  His concern for the environment and need for the nuclear reactor to manage natural resources effectively.

Question. Amrit’s school insisted on carpooling and initiates a campaign to encourage parents to volunteer for the same. Amrit’s father does not want to participate in this initiative. Amrit is unhappy that his father is not cooperating.
a. Why is Amrit unhappy? 
b. How will you as Amrit’s friend help him?
Answer:
a. Amrit is unhappy that his father is insensitive to the environment and is unwilling to become a part of a campaign which will benefit the society, particularly the environment
b. I will help Amrit by meeting his father and help him understand the significance of carpooling. The need to save energy in the form of fuel and the significance of sustainable development will be elaborated upon. The need to reduce the greenhouse gases and thereby global warming will be explained 

Question. India has banned the import of CFC into the country. Do you support it and why? 
Answer :  Yes , I support this decision of the government. The decision shows the responsibility of the government towards the environment since CFC product causes ozone depletion and is a greenhouse gas and contributes to global warming. 

Question. When we check the human population figures of the world, it is growing in exponential manner, using all the resources. Is it morally correct for one species to grow in this manner? What is the other type of growth pattern? Explain.
Answer :  textual answer Value: Equality, concern for other living beings

Question. List any three ways of measuring population density. In an area if there are 200 Parthenium and 2 huge banyan trees, due to difference in their number we may underestimate the enormous role of banyan tree in the community. What important life value do you get from it? 
Answer :  quality plays a more important role than quantity, equality, appreciation of others

Question. Warblers are known to show resource partitioning and have learnt to co-exist. Can you think of 2 other life situations where sharing is beneficial.
Answer :  adjustment , appreciation of available environment, no competition

Question. Explain the process of decomposition. Dead leaves, flowers and animals are the raw materials for decomposition, so it cannot be considered waste. Similarly what we consider waste may be useful to others. Discuss.
Answer :  recycling, reducing waste, saving the environment

Question. List five services of a healthy forest ecosystem. b) Man is directly or indirectly depending on plants for his life. Due to overexploitation and greediness forests are destroyed at a tremendous rate. How can man act judiciously in such situations.
Answer :  sustainable management, no wastage, conservation, equal distribution

Question. Explain how xerach sucession progresses from xeric to mesic. Important characteristic of all community is that they constantly change. This change may encourage some species and eliminate other species .can you equate it to real life situations and how we can cope with changes in life?
Answer :  positive outlook, courage, dealing with failures as a part of life, accept disappointments

Question. Carbon cycle is disturbed due to man’s activities .What are the various activities by which man disturbs carbon cycle. How can we live in harmony with nature? 
Answer :  judicious use of any resource, sharing, concern for others

Question. What are the limitations of ecological pyramids? How can we recognize and overcome them?
Answer :  ppreciation of others, accepting decisions , freedom of thought

More Questions

The city government is planning to bring metro rail to your area. But this will require around 10,000 trees to be cut. Do you think govt. should go ahead with the project? Justify your answer?
• Yes. But the track of metro should be so changed that minimum no of trees are cut.
Track can be made underground and more trees can be planted after the project is over.

Values
• Sensitivity towards environment
• Decision making.

You find that a lake in your neighboring area has been covered by Water hyacinth. You have contacted your friends to remove this weed. Nobody agrees to support you .How will you explain the necessity of this?
• Friends should be explained the process of natural ageing of a lake by mineral enrichment of water. (eutrophication) which is harmful to aquatic life .

Values
• Problem solving
• Critical thinking.
• Responsibility 

Now a days we see that people use CD’s and DVD’s for storing information, movies and songs. Do you think these things create pollution?
• Yes. Because all this material contain heavy metals and toxics substances and known as e-wastes.

Values
• Concern about environment.
• Awareness.

Government of India has launched clean Ganga programme by the name Ganga Action Plan. Do you want to be a part of it? How?
• Yes I will start awareness programmes like Nukkad Nataks, rallies and slogans making to keep the river clean.

Values
• Innovation
• Service to society 

You have read the newspaper reports that lots of cows die because of polythene bags getting entangled in their intestine. You go to market and see vegetable vender selling vegetables in plastic bags. What will be your suggestion to - (i) buyer and (ii) seller?
 I) Use cloth or jute bag to save environment and thus life of cow
II) Use paper bags, polythene are non biodegradable and toxic. 

Values
• Sensitivity to words environment
• Concern.
 

One of your friends Rakesh has gone to jungle safari with his family. On returning from that safari he is sharing experiences with you and tells that his father who is a businessman hunted a deer with his gun. What will you tell your friend after knowing about their expedition?
• It is unethical and leads to loss of biodiversity and result in imbalance in Eco system. 

Values
• Concern about animal.
• Empathy.

Pankhuri watched a TV program based on life in polar region. She observed that all the animals in polar region possess larger size and smaller animals are not found in that region. She asked about this surprising fact to her friends. Being her friend, how can you satisfy her curiosity?
• Because smaller animals have larger surface area relative their volume so they lose body heat very fast when it is cold outside. They have to expense lot of energy to generate body heat.

Vales
• Critical thinking
• Awareness.

Ajay a notorious boy often involved in destruction of surrounding plants and killing small animals. You are given a responsibility to make him understand about importance of each and every organism present in world. How can you explain him about it and which hypothesis you will use for it?
• Explanation through “Rivet popper hypothesis.

Values
• Social responsibility
• Concerns about eco system.

A well known personality killed a back buck during hunting in sacred groves of Aravali Hills in Rajasthan. Local people caught him and lodged a case in court against him. He argued that court that killing a human being is a crime but killing a animal is not crime.
• Do you favor his argument? Why?
• What is the role of scared groves? Mention any two names of such places other than Aravali Hills.
• A) No because each living organism has its own role in balanced eco system.
b) Sacred groves are culturally protected area where large no of rare and Threatened wild life is given total protection.
[Any other two sacred groves]

Values
• Awareness
• Responsibility.

Anil and Sunil are partners and established a factory. After a few months electrostatic precipitator became out of order. Sunil wanted to replace it but Anil expressed the view that they have no effect of it on productivity as well as income; therefore they should not waste money to replace it.
(a)Out of these partners whom do you support and why?
(b) Suggest any two measures to stop such negligence. 
• A) I will support Sunil because his approach is eco friendly.
B) By imposing fine and punishment Cancellation of registration of such industries 

Values
• Decision making
• Concern about environment 

A team of research workers observed that the population of fish eating birds is declining every year after the establishment of a pesticide factory nearby five years ago.
(a) What may be the possible reason in your opinion? Explain?
(b) Can you suggest alternative to pesticide so that factory may be stopped.
• A) Pesticide entering in food chain and resulting in biomagnifications
• Bio controlling agent to remove pest 

Values
• Problem solving
• Critical thinking.

A few months ago the people of Ramgarh started a bad practice of disposing their waste in the pond of village which was earlier source of drinking water. It resulted in deterioration of quality of water and fish mortality.
(a) What changes do you think have taken place in pond? Name such condition.
(b) What measure will you take to stop villagers for such practices as well as to improve the condition?
 A) Eutrophication – Brief explanation.
B) Any two means of spreading awareness of disposal of waste and keeping the pond clean.

Values 
• Service to society
• Concern about environment.

Refer to below link to download CBSE Class 12 Biology VBQs Ecology Set A