Test 6 (Class 12)- Type Bio SCAN (Old NCERT)Contact Number: 8527521718Test 6 (Class 12)- Type Bio SCAN (Old NCERT)Contact Number: 8527521718Match List-I with List-II:
| List I | List II | ||
| (a) | Vaults | (i) | Entry of sperm through the Cervix is blocked |
| (b) | IUDs | (ii) | Removal of Vas deferens |
| (c) | Vasectomy | (iii) | Phagocytosis of sperms within the Uterus |
| (d) | Tubectomy | (iv) | Removal of the fallopian tube |
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iv) | (iii) | (i) |
| 2. | (iii) | (i) | (iv) | (ii) |
| 3. | (iv) | (ii) | (i) | (iii) |
| 4. | (i) | (iii) | (ii) | (iv) |
Consider the following statements:
| I: | The uterine endometrium undergoes cyclical changes during the menstrual cycle. |
| II: | Estrogen secreted during the pre-ovulatory phase of the menstrual cycle helps in the development of follicle. |
| III: | hCG secreted by trophoblast cells helps in maintaining corpus luteum. |
In some members of which of the following pairs of families, pollen grains retain their viability for months after release?
1. Poaceae; Solanaceae
2. Rosaceae; Leguminosae
3. Poaceae; Rosaceae
4. Poaceae; Leguminosae
The fetus body is covered with fine hair, eye-lids separate and eyelashes are formed by the end of:
1. One month of pregnancy
2. Two months of pregnancy
3. Three months of pregnancy
4. Six months of pregnancy
What is the fate of the male gametes discharged in the synergid?
| 1. | One fuses with the egg and the other fuses with central cell nuclei |
| 2. | One fuses with the egg and other(s) degenerate(s) in the synergid |
| 3. | All fuse with the egg |
| 4. | One fuses with the egg and other(s) fuse(s) with the synergid nucleus |
Select the hormone-releasing Intra-Uterine Devices:
1. Lippes Loop, Multitoad 375
2. Vaults, LNG-20
3. Multiload 375, Progestasert
4. Progestasert, LNG-20
Nucellar polyembryony is reported in which of the following species?
1. Citrus
2. Gossypium
3. Triticum
4. Brassica
The part of the fallopian tube where fertilization most commonly takes place is:
1. Infundibulum
2. Ampulla
3. Isthmus
4. Fundus
The diagram shows water hyacinth. It reproduces by the sub aerial modification of stem known as:
1. Runner
2. Stolon
3. Offset
4. Sucker
A dioecious flowering plant prevents both:
| 1. | Autogamy and xenogamy |
| 2. | Autogamy and geitonogamy |
| 3. | Geitonogamy and xenogamy |
| 4. | Cleistogamy and xenogamy |
Select the correct sequence of events:
| 1. | Gametogenesis → Gamete transfer → Syngamy → Zygote → Cell division (Cleavage) → Cell differentiation → Organogenesis |
| 2. | Gametogenesis → Gamete transfer → Syngamy → Zygote → Cell division (Cleavage) → Organogenesis → Cell differentiation |
| 3. | Gametogenesis → Syngamy → Gamete transfer → Zygote → Cell division (Cleavage) → Cell differentiation → Organogenesis |
| 4. | Gametogenesis → Gamete transfer → Syngamy → Zygote → Cell differentiation → Cell division (Cleavage) → Organogenesis |
In the given diagram, identify A, B, C, and D respectively:
| 1. | LH, FSH, Progesterone and Estrogen |
| 2. | FSH, LH, Estrogen and Progesterone |
| 3. | Estrogen, Progesterone, LH and FSH |
| 4. | Progesterone, Estrogen, FSH and LH |
Seminal plasma has contributions of all the following except:
1. bulbourethral glands.
2. testes.
3. seminal vesicles.
4. prostate gland
The shared terminal duct of the reproductive and urinary system in the human male is:
| 1. | Urethra | 2. | Ureter |
| 3. | Vas deferens | 4. | Vasa efferentia |
In humans, the sex of the baby is determined:
| 1. | At the time of fertilization and by the father |
| 2. | At the time of fertilization and by the mother |
| 3. | At the time of implantation and by the father |
| 4. | At the time of implantation and by the mother |
Which one of the following statements about human sperm is correct?
1. Acrosome has a conical pointed structure used for piercing and penetrating the egg, resulting in fertilization
2. The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilization
3. Acrosome serves as a sensory structure leading the sperm towards the ovum
4. Acrosome serves no particular function
| (A) | Medical Termination of Pregnancy(MTP) during the first trimester is generally safe. |
| (B) | Generally, chances of conception are nil until the mother breastfeeds the infant for up to two years. |
| (C) | Intrauterine devices like copper-T are effective contraceptives. |
| (D) | Contraception pills may be taken up to one week after coitus to prevent conception. |
Which two of the above statements are correct?
1. B, C
2. C, D
3. A, C
4. A, B
Select the option including all sexually transmitted diseases:
1. Gonorrhoea, Malaria, Genital herpes
2. AIDS, Malaria, Filaria
3. Cancer, AIDS, Syphilis
4. Gonorrhoea, Syphilis, Genital herpes
What is the genetic disorder in which an individual has an overall masculine development gynaecomastia, and is sterile?
1. Down's syndrome
2. Turner's syndrome
3. Klinefelter's syndrome
4. Edward syndrome
The abnormal hemoglobin seen in patients of sickle cell anemia is HbS. It is different in structure from the normal HbA because:
| 1. | glutamic acid is replaced by valine in the beta chain |
| 2. | the two beta chains are replaced by gamma chains |
| 3. | it has two heme groups instead of four |
| 4. | it consists of only a single globin chain and heme |
A gene showing codominance has:
| 1. | alleles tightly linked on the same chromosome |
| 2. | alleles that are recessive to each other |
| 3. | both alleles independently expressed in the heterozygote |
| 4. | one allele dominant on the other |
A woman is of blood type A. Her daughter is type O and her son is type B. Which of the following is a possible phenotype for the father?
1. A
2. O
3. B
4. AB
When a cluster of genes show linkage behaviour, they:
| 1. | Do not show chromosome map |
| 2. | Induce cell division |
| 3. | Do not show independent assortment |
| 4. | Show recombination during meiosis |
Match the items of Column - I with Column - II:
| Column-I | Column-II | ||
| (a) | XX-XO method of sex determination | (i) | Turner's syndrome |
| (b) | XX-XY method of sex Determination | (ii) | Female heterogametic |
| (c) | Karyotype-45 | (iii) | Grasshopper |
| (d) | ZW-ZZ method of Sex Determination | (iv) | Female homogametic |
Select the correct option from the following:
1. (a) - (ii), (b)- (iv), (c)- (i), (d)-(iii)
2. (a) - (i), (b)- (iv), (c)- (ii), (d)-(iii)
3. (a) - (iii), (b)- (iv), (c)- (i), (d)-(ii)
4. (a) - (iv), (b)- (ii), (c)- (i), (d)-(iii)
Satellite DNA is important because it:
| 1. | Codes for proteins are needed in the cell cycle. |
| 2. | Shows a high degree of polymorphism in the population and also the same degree of polymorphism in an individual which is inheritable from parents to children. |
| 3. | Does not code for proteins and is the same in all members of the population. |
| 4. | Codes for enzymes needed for DNA replication. |
What initiation and termination factors are involved in transcription in prokaryotes?
| 1. | σ and ρ , respectively |
| 2. | α and β , respectively |
| 3. | β and γ , respectively |
| 4. | α and σ , respectively |
In the polynucleotide chain of DNA, a nitrogenous base is linked to the –OH of:
(1) 2'C pentose sugar
(2) 3'C pentose sugar
(3) 5'C pentose sugar
(4) 1'C pentose sugar
| 1. | more commonly in males than in females |
| 2. | more commonly in females than in males |
| 3. | in males and in females equally |
| 4. | only in the males and never in the females |
If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is bp, then the length of the DNA is approximate:
| 1. | 2.5 meters | 2. | 2.2 meters |
| 3. | 2.7 meters | 4. | 2.0 meters |
SNPs in human genome are located at about:
1. 1.4 million locations
2. 1.7 million locations
3. 2.1 million locations
4. 2.4 million locations
Which one of the following traits of garden peas studied by Mendel was a recessive feature?
| 1. | Axial flower position |
| 2. | Green seed colour |
| 3. | Green pod colour |
| 4. | Round seed shape |
| I. | the fact that the alleles do not show any blending and that both the characters are recovered as such in the F2 generation though one of these is not seen at the F1 stage. |
| II. | the fact that though the parents contain two alleles during gamete formation, the factors or alleles of a pair segregate from each other such that a gamete receives only one of the two factors. |
First child of a normal male and female is albino, what are the chances of second child being albino:
1. 25%
2. 50%
3. 75%
4. 100%
A molecule that can act as a genetic material must fulfill all the following criteria except:
| 1. | It should be able to generate its replica. |
| 2. | It should be stable chemically and structurally. |
| 3. | It should provide scope for large-scale mutations that occur at a fast rate. |
| 4. | It should be able to express itself in the form of Mendelian Characters. |
In transgenics expression of a transgene in the target tissue is determined by:
1. Transgene
2. Promoter
3. Reporter
4. Enhancer
Removal of introns describes which of the following processes in relation to the primary transcript in eukaryotes?
1. Trimming
2. 5' capping
3. Poly-A tailing
4. Splicing
What will be the sequence of mRNA produced by the following stretch of DNA?
3' ATGCATGCATGCATG 5' TEMPLATE STRAND
5' TACGTACGTACGTAC 3' CODING STRAND
1. 3' AUGCAUGCAUGCAUG 5'
2. 5' UACGUACGUACGUAC 3'
3. 3' UACGUACGUACGUAC 5'
4. 5' AUGCAUGCAUGCAUG 3'
What ratio is expected in offsprings if father is colour blind and mother's father was colour blind:
1. 50% daughter – colour blind
2. All the sons are colour blind
3. All the daughters colour blind
4. All the sons are normal
The gene expression is almost always regulated in prokaryotes at the level of:
1. initiation of transcription
2. processing level
3. transport of mRNA
4. translational level
In the Avery, MacLeod, and McCarty experiment, transformation will not take place if the tube is treated with:
1. lipase
2. RNase
3. DNase
4. protease
Which enzyme/s will be produced in a cell in which there is a nonsense mutation in the lac Y gene?
1. Lactose permease
2. Transacetylase
3. Lactose permease and transacetylase
4. β-galactosidase
The chronological order of human evolution from early to the recent is:
| 1. | Ramapithecus → Australopithecus → Homo habilis → Homo erectus |
| 2. | Ramapithecus → Homo habilis → australopithecus → Homo erectus |
| 3. | Australopithecus → Homo habilis → Ramapithecus → Homo erectus |
| 4. | Australopithecus → Ramapithecus → Homo habilis → Homo erectus |
Industrial melanism is an example of
1. drug resistance
2. darkening of skin due to smoke from industries
3. protective resemblance with the surroundings
4. defensive adaptation of skin against ultraviolet radiations.
Mammals are the descendents of the reptilian group :
1. Therapsids
2. Thecodonts
3. Pelycosaurs
4. Dinosaurs
During the replication of bacterial chromosomes, DNA synthesis starts from a replication origin site and:
1. Is facilitated by telomerase
2. Moves in one direction of the size
3. Moves in a bi-directional way
4. RNA primers are involved
Match List-I with List-II:
| List-I | List-II |
| (a) Adaptive radiation | (i) Selection of resistant varieties due to excessive use of herbicides and pesticides |
| (b) Convergent evolution | (ii) Bones of forelimbs in Man and Whale |
| (c) Divergent evolution | (iii) Wings of Butterfly and Bird |
| (d) Evolution by anthropogenic action | (iv) Darwin Finches |
Choose the correct answer from the options given below.
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (i) | (iv) | (iii) |
| 2. | (i) | (iv) | (iii) | (ii) |
| 3. | (iv) | (iii) | (ii) | (i) |
| 4. | (iii) | (ii) | (i) | (iv) |
From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask:
| 1. | |
| 2. | |
| 3. | |
| 4. |
Change in the frequency of an allele in a population due to random sampling of organisms brought about by a chance event is called:
1. Gene flow
2. Genetic drift
3. Natural selection
4. Saltation
The process whereby organisms not closely related (not monophyletic), independently evolve similar traits as a result of having to adapt to similar environments or ecological niches, is called as:
1. Convergent evolution
2. Divergent evolution
3. Adaptive radiation
4. Saltation
