WorksheetsXII - S1 - ZOO - CHAP - 1, 2, 3 & 4
Total questions: 25
Worksheet time: 13mins
The unidirectional transfer of genetic material from a donor bacterium to recipient bacterium by cell to cell contact is termed as
a) Transformation
b) Conjugation
c) Recombination
d) Transduction
Which one of the following generates new genetic combinations leading to variation?
a) Vegetative reproduction
b) Parthenogenesis
c) Sexual reproduction
d) Nucellar polyembryony
If for some reason, the vasa efferentia in the human reproductive system get blocked, the gametes will not be transported from:
a) Testes to epididymis
b) Epididymis to vas deferens
c) Ovary to uterus
d) Vagina to uterus
Assertion: The primary reproductive organs namely the ovary and testis are responsible for producing the ova and sperms respectively.
Reason: Hormones secreted by the pituitary gland and the gonads help in the development of the secondary sexual characteristics, maturation of the reproductive system and regulation of normal functioning of the reproductive system.
a) Both assertion and reason are true and the reason is the correct explanation of the assertion
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false statements
The leydig cells as found in the human body are the secretory source of:
a) glucagon
b) androgens
c) progesterone
d) intestinal mucus
Sterilisation techniques are generally fool proof methods of contraception with least side effects. Yet, this is the last option for the couples because
(i) it is almost irreversible
(ii) of the misconception that it will reduce sexual urge/ drive
(iii) it is a surgical procedure
(iv) of lack of sufficient facilities in many parts of the country
Choose the correct option:
a) i and iii
b) ii and iii
c) i and iv
d) i, ii, iii and iv
Select the option which correctly fills up the blanks in following statements.
(i) Destruction of embryo or foetus in the uterus is called
(ii) Government of India legalized MTP in the year
(iii) Natural family planning method is also called
(iv) is a method in which the male partner withdraws his penis from vagina just before ejaculation.
(v) is the copper releasing and is hormone releasing intra uterine devices
a) (i) foeticide,
(ii) 1961
(iii) rhythm method
(iv) Safety period
(v) Multiload 375, LNG- 20
b) (i) foeticide,
(ii) 1971
(iii) rhythm method
(iv) coitus interruptus
(v) Multiload 375, LNG- 20
c) (i) foeticide,
(ii) 1971
(iii) rhythm method
(iv) coitus interruptus,
(v) LNG- 20, Multiload 375
d) (i) matricide
(ii) 1982
(iii) contraception method
(iv) periodic abstinence
(v) Multiload 375, LNG- 20
Which of the following is not correct?
a) Three or more alleles of a trait in the population are called multiple alleles
b) A normal gene undergoes mutations to form many alleles
c) Multiple alleles map at different loci of a chromosome
d) A diploid organism has only two alleles out of many in the population
Assertion: The Rh factor or Rh antigen is found on the surface of erythrocytes.
Reason: The term ‘Rh factor’ refers to immunogenic D antigen of the Rh blood group system.
a) Both assertion and reason are true and the reason is the correct explanation of the assertion
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false statements
Assertion: Persons suffering from haemophilia fail to produce blood clotting factor VIII.
Reason: Prothrombin producing platelets in such persons are found in very low concentration.
a) both Assertion and Reason are true and Reason is the correct explanation of Assertion.
b) both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
c) Assertion is true but Reason is false.
d) both Assertion and Reason are false.
Assertion: The offsprings show “uniparental inheritance” without any genetic variation.
Reason: The different modes of asexual reproduction seen in animals are fission, sporulation, budding, gemmule formation, fragmentation and regeneration.
a) Both assertion and reason are true and the reason is the correct explanation of the assertion
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false statements
Assertion: Asexual reproduction is wide spread among different organisms.
Reason: It is common in members of Protista, Bacteria, Archaea and in multicellular organisms with relatively simple organisation.
a) Both assertion and reason are true and the reason is the correct explanation of the assertion
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false statements
In which type of parthenogenesis are only males produced?
a) Arrhenotoky
b) Thelytoky
c) Amphitoky
d) Both a and b
Assertion: The bulbourethral glands are inferior to the prostate and their secretions also help in the lubrication of the penis.
Reason: The prostate encircles the urethra and is just below the urinary bladder and secretes a slightly acidic fluid that contains citrate, several enzymes and prostate specific antigens.
a) Both assertion and reason are true and the reason is the correct explanation of the assertion
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false statements
The male sex hormone testosterone is secreted from
a) Sertoli cells
b) Leydig cell
c) Epididymis
d) Prostate gland
Assertion (A) : The acrosome of the sperm cell contains sperm lysin.
Reason (R) : Sperm lysin destroys the deformed sperm cells.
a) R explains A
b) A is right, R is wrong
c) A and R are right & R does not explains A
d) Both A and R are wrong
Statement (1) : Human pregnancy lasts for 35 weeks.
Statement (2) : During gestation, embryo's heat develops during 12th week.
a) Statement 1 is correct; statement 2 is incorrect
b) Statement 1 is incorrect; statement 2 is correct
c) Both the statements 1 and 2 are correct
d) Both the statements 1 and 2 are incorrect
Assertion: Intrauterine devices are inserted by medical experts in the uterus through the vagina.
Reason: These devices are available as copper releasing IUDs, hormone releasing IUDs and nonmedicated IUDs.
a) Both assertion and reason are true and the reason is the correct explanation of the assertion
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false statements
A contraceptive pill prevents ovulation by
a) blocking fallopian tube
b) inhibiting release of FSH and LH
c) stimulating release of FSH and LH
d) causing immediate degeneration of released ovum
Assertion: Continuous abstinence is the simplest and most reliable way to avoid pregnancy is not to have coitus for a defined period that facilitates conception.
Reason: Coitus interruptus is the oldest family planning method. The male partner withdraws his penis before ejaculation, thereby preventing deposition of semen into the vagina.
a) Both assertion and reason are true and the reason is the correct explanation of the assertion
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false statements
Assertion: In this method of sex determination the males are heterogametic producing dissimilar gametes while females are homogametic producing similar gametes.
Reason: It is of two kinds XX-XX type and XX-YX type
a) Both assertion and reason are true and the reason is the correct explanation of the assertion
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false statements
Assertion: Heterogametic Females is a method of sex determination, the homogametic male possesses two ‘X’ chromosomes as in certain insects and certain vertebrates like fishes, reptiles and birds producing a single type of gamete; while females produce dissimilar gametes.
Reason: The female sex consists of a single ‘X’ chromosome or one ‘X’ and one ‘Y’ chromosome. Thus the females are heterogametic and produce two types of eggs.
a) Both assertion and reason are true and the reason is the correct explanation of the assertion
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false statements
Assertion: ZW-ZZ type is a method of sex determination occurs in certain insects (gypsy moth) and in vertebrates such as fishes, reptiles and birds.
Reason: In this method the female has one ‘Z’ and one ‘W’ chromosome (ZW) producing three types of eggs, some carrying the Z chromosomes and some carry the W chromosome.
a) Both assertion and reason are true and the reason is the correct explanation of the assertion
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false statements
Assertion: Current analysis of Y chromosomes has revealed numerous genes and regions with potential genetic function.
Reason: Present at both ends of the Y chromosome are the pseudoautosomal regions (PARs) that are similar with regions on the X chromosome which synapse and recombine during meiosis.
a) Both assertion and reason are true and the reason is the correct explanation of the assertion
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false statements
Identify the proper dominance hierarchy.
a) IA = IO > IB
b) IA = IB > O
c) IO = IB > IA
d) IB = IA < O
