NEET 2022 Biology Questions

Which stage of meiosis can last for months or years in the oocytes of some vertebrates? []

Regarding meiosis, which of the statements is incorrect? []

Select the incorrect statement with reference to mitosis: []

Which one of the following never occurs during mitotic cell division? []

The appearance of recombination nodules on homologous chromosomes during meiosis characterizes: []

In meiosis, crossing over and exchange of material between homologous chromosomes is catalyzed by the enzyme: []

The ability of plants to follow different pathways in response to environment leading to formation of different kinds of structures is called ( Phase 2)

Production of cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants? ( Phase 1)

Which of the following growth regulators is an adenine derivative? ( Phase 2)

The gaseous plant growth regulator is used in plants to: ( Phase 1)

Which one of the following plants does not show plasticity? ( Phase 1)

Which one of the following hormones is not involved in sugar metabolism? ()

A person with abnormally low basal metabolic rate is likely to be suffering from deficiency of: ()

Identify the cells that produce androgens in the testis. ()

Which of the following is a function of parathyroid hormone? ()

Which one of the following hormone pairs is not antagonistic (opposing) in action? ()

Which of the following statements is NOT correct? [ ]

Which one of the following plants shows vexillary aestivation and diadelphous stamens? []

Identify the correct set of statements: I. The leaflets are modified into pointed hard thorns in Citrus and Bougainvillea II. Axillary buds form slender and spirally coiled tendrils in Cucumber and Pumpkin III. Stem is flattened and fleshy in Opuntia and modified to perform the function of leaves IV. Rhizophora shows vertically upward growing roots that help to get oxygen for respiration V. Subaerially growing stems in grasses and strawberry help in vegetative propagation Choose the correct answer from the options given below: []

The flowers are zygomorphic in: a) Mustard b) Gulmohar c) Cassia d) Datura e) Chilly Choose the correct answer from the options given below: []

DNA Polymorphism forms the basis of: ()

In an E. coli strain, i gene gets mutated and its product cannot bind the inducer molecule. If lactose is provided, what will be the outcome? ()

If A and C make 30% and 20% of DNA, respectively, what will be the % composition of T and G? ( Phase 2)

Ten E.coli cells with ¹⁵N–DNA are incubated in ¹⁴N medium. After 60 minutes, how many cells will have DNA free from ¹⁵N? ()

Given below are two statements: ( Phase 2) Statement I: DNA polymerases catalyse polymerisation only in one direction, 5′ → 3′. Statement II: During replication, one strand is continuous, other discontinuous. Choose the correct answer:

In lac operon, z gene codes for: ( Phase 2)

Match List – I with List – II ( Phase 2)

The process of translation of mRNA to proteins begins as soon as: ()

Against the codon 5′ UAC 3′, what would be the sequence of anticodon on tRNA? ( Phase 2)

Read the following statements and choose the set of correct statements: () (A) Euchromatin is loosely packed chromatin (B) Heterochromatin is transcriptionally active (C) Histone octamer is wrapped by negatively charged DNA in nucleosome (D) Histones are rich in lysine and arginine (E) A typical nucleosome contains 400 bp of DNA helix Choose the correct set:

If the length of a DNA molecule is 1.1 metres, what will be the approximate number of base pairs? ()

If a geneticist uses the blind approach for sequencing the whole genome of an organism, followed by assignment of function to different segments, the methodology adopted is called: ()

A certain plant homozygous for yellow seeds and red flowers was crossed with a plant homozygous for green seeds and white flowers. The F₁ plants had yellow seeds and pink flowers. The F₁ plants were selfed to get F₂ progeny. Assuming independent assortment of the two characters, how many phenotypic categories are expected for these characters in the F₂ generation? ()

A heterozygous pea plant with violet flowers was crossed with a homozygous pea plant with white flowers. Violet is dominant over white. Which one of the following represents the expected combinations among 40 progenies formed? ()

The chromosomal theory of inheritance was proposed by: ()

What is the expected percentage of F₂ progeny with yellow and inflated pod in a dihybrid cross experiment involving pea plants with green coloured, inflated pod and yellow coloured, constricted pod? ()

Which of the following statements are correct about Klinefelter’s Syndrome? A. This disorder was first described by Langdon Down (1866). B. Such an individual has overall masculine development. However, the feminine development is also expressed. C. The affected individual is short statured. D. Physical, psychomotor and mental development is retarded. E. Such individuals are sterile. Choose the correct answer from the options given below: ()

The phenomenon of pleiotropism refers to:()

In meiosis, crossing over and exchange of genetic material between homologous chromosomes are catalyzed by the enzyme: ()

Given below are two statements: Statement I: Sickle cell anaemia and haemophilia are autosomal dominant traits. Statement II: Sickle cell anaemia and haemophilia are disorders of the blood. In the light of the above statements, choose the correct answer from the options given below: ()

Frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by: ()

Select the correct statement(s) with respect to the mechanism of sex determination in Grasshopper. (A) It is an example of female heterogamety. (B) Male produces two different types of gametes either with or without X chromosome. (C) Total number of chromosomes (autosomes and sex chromosomes) is same in both males and females. (D) All eggs bear an additional X chromosome besides the autosomes. ()

Which of the following are true about the taxonomical aid ‘key’? ( Phase 2) (a) Keys are based on the similarities and dissimilarities. (b) Key is analytical in nature. (c) Keys are based on the contrasting characters in pair called couplet. (d) Same key can be used for all taxonomic categories. (e) Each statement in the key is called Lead.

Western Ghats have a large number of plant and animal species that are not found anywhere else. Which of the following term is used to notify such species? ( Phase 2)

Match the List-I with List-II: ( Phase 2) List – I (a) Carbon dissolved in oceans (b) Annual fixation of carbon through photosynthesis (c) PAR captured by plants (d) Productivity of oceans List – II (i) 55 billion tons (ii) 4 × 10¹³ kg (iii) 2 to 10% (iv) 71% Choose the correct answer from the options given below:

In-situ conservation refers to: ( Phase 1)

Habitat loss and fragmentation, over-exploitation, alien species invasion and co-extinction are causes for: ( Phase 1)

Match the List-I with List-II: ( Phase 2) List – I (a) Sacred groves (b) Zoological park (c) Nile perch (d) Amazon forest List – II (i) Alien species (ii) Release of large quantity of oxygen (iii) Ex-situ conservation (iv) Khasi Hills in Meghalaya

Frugivorous birds are found in large numbers in tropical forests mainly because of: ( Phase 2)

Which of the following is not a method of ex situ conservation? ( Phase 1)

[ Phase 2] How many secondary spermatocytes are required to form 400 million spermatozoa?

[ Phase 2] Arrange the components of mammary gland from proximal to distal: (a) Mammary duct (b) Lactiferous duct (c) Alveoli (d) Mammary ampulla (e) Mammary tubules Choose the correct answer:

[ Phase 2] Assertion (A): During pregnancy the level of thyroxine is increased in the maternal blood. Reason (R): Pregnancy is characterised by metabolic changes in the mother.

[] Given below are two statements: Statement I: The release of sperms into the seminiferous tubules is called spermiation. Statement II: Spermiogenesis is the process of formation of sperms from spermatogonia. Choose the most appropriate answer:

[] At which stage of life is the oogenesis process initiated?

[] Which of the following statements are true for spermatogenesis but do not hold true for oogenesis? (a) It results in the formation of haploid gametes (b) Differentiation of gamete occurs after the completion of meiosis (c) Meiosis occurs continuously in a mitotically dividing stem cell population (d) It is controlled by LH and FSH secreted by anterior pituitary (e) It is initiated at puberty