OSSSC TGT Science CBZ Mock Test - 10 - OTET MCQ

Phonological awareness is recognized as a skill that includes identifying and manipulating units of oral language parts like onsets, words, syllables. It is the ability to reflect and manipulate the sound structure. It focuses on manipulating individual sounds (phonemes) in spoken words. For eg- a teacher asks the child to break the word MAT into individual sounds M-A-T.
Hence, the correct answer is, 'Reflect and manipulate the sound structure.'

Development is a process of gradual transformation. It is associated with both quantitative and qualitative. Development takes place when there is a positive change in quality. For eg- A child’s IQ level is low during childhood, but it can improve into adulthood. A child’s IQ level can improve from 50 to 90 after developing their creative and critical thinking skills.
Hence, the correct answer is, 'Both quantitative and qualitative.'

Krebs cycle occurs inside the matrix of mitochondria.The cycle is also known as the citric acid cycle or tricarboxylic acid cycle. It includes stepwise oxidative and cyclic degradation of activated acetate derived from pyruvic acid.

Phytochrome absorbs red of wavelength 660nm and far red of wavelength 730nm.

Frederick Frost Blackman proposed the law of limiting factors. Blackman proposed this law in 1905 according to which, a chemical process depends on multiple factors the rate of the process will be limited by the pace of the slowest factor or limiting factor.

The maximum photosynthesis takes place in blue and red regions of the visible light as indicated by the absorption spectra of chlorophyll a and chlorophyll b. Absorption spectrum of a particular pigment is the curve plotted on a graph paper representing the amount of light absorbed at each wavelength by that pigment. The absorption spectra of these pigments show that they absorb maximum at 480 nm (blue light) and 680 nm (red light) regions of spectrum.

Thus, the correct answer is option C.

When several factors affect any [bio] chemical process, Blackman’s (1905) Law of Limiting Factors comes into effect.

• According to this law, If a chemical process is affected by more than one factor, then its rate will be determined by the factor which is nearest to its minimal value: it is the factor that directly affects the process if its quantity is changed.

Auxins were first isolated from human urine. The term auxin is applied to the indole-3-acetic acid (IAA), and to other natural and synthetic compounds having certain growth-regulating properties.

Cytokinins have specific effects on cytokinesis and were discovered as kinetin from the autoclaved herring sperm DNA.
Kinetin does not occur naturally in plants. Search for natural substances with cytokinin-like activities led to the isolation of zeatin from corn kernels (corn germ oil) and coconut milk.

Hence option C is correct.

• All cells of a plant are descendants of the zygote.
• Trees continue to increase in height or girth over some time.
• However, the leaves, flowers and fruits of the same tree appear and fall periodically and sometimes repeatedly.

The measurement and the comparison of total growth per unit time is called the absolute growth rate.

During noncyclic electron flow the electron hole in P-680 is filled by electrons obtained by photolysis of water. As a result, there is an evolution of oxygen and the electron move through Mn-protein bound to PS II. In this transport Mn⁺⁺ is oxidised to Mn⁺⁺⁺ and then reduced to Mn⁺⁺ in a cyclic manner. The manganese thus transfers electrons from water to photosystem II and thus plays an important role in electron transport in the process of photosynthesis.

During citric acid cycle, Succinic acid is converted into Fumaric acid during which FAD + FAD +  molecules is produce that produce 2 ATP molecules.

During aerobic respiration O₂ is consumed and CO₂ is released. The ratio of the volume of CO₂ evolved to the volume of O₂ consumed in respiration over a period of time is called as respiratory quotient (RQ) or respiratory ratio.

The respiratory quotient depends upon the type of respiratory substrate used during respiration.

(i) When carbohydrates are used as substrate and are completely oxidized the RQ will be 1, because equal amounts of CO₂ and O₂ are evolved and consumed respectively.

(ii) When proteins are respiratory substrates, the ratio would be about 0.9.

• Monera is a kingdom that contains unicellular organisms with a prokaryotic (is a unicellular organism that lacks a membrane- bound nucleus, mitochondria, or any other membrane- bound organelle.) cell organization, like bacteria.
• They are single- celled organisms with no true nuclear membrane. The taxon Monera was first proposed as a phylum by Ernst Haeckel in 1866. 

Hence, the correct option is B
NCERT Reference: Topic-  Kingdom Monera of chapter "Biological Classification" of NCERT.

Glycocalyx is the outermost layer of the cell envelope. Cell wall lies between plasma membrane andd glycocalyx.

• Each testicular lobule contains one to three highly coiled seminiferous tubules in which sperms are produced.
• Each seminiferous tubule is lined on its inside by two types of cells called male germ cells (spermatogonia) and Sertoli cells.
• The male germ cells undergo meiotic divisions finally leading to sperm formation, while Sertoli cells provide nutrition to the germ cells.

Hence, the Correct Answer is D

Nostoc occurs in both aquatic and subaerial habitats. A dense mucilage covering (labelled as B in the given figure) is present on the outside. Each trichome is beaded, S-shaped and consists of a large number of vegetative cells, a few term in a land intercalary large pale coloured heterocysts - (labelled as A in the given figure) and thick-walled resting cells called akinetes. Heterocysts are specialised to perform nitrogen fixation.

• LH is a Luteinizing hormone produced by the gonadotropic cells in the anterior pituitary gland.
• It plays an important role in puberty, menstruation, and fertility.
• It triggers ovulation and development of the corpus luteum.
• In male, LH triggers the secretion of androgen called testosterone from the Leydig cells.
• FSH is follicle-stimulating hormone produced by gonadotropic cells in the anterior pituitary gland.
• It helps in regulation of development, growth, pubertal maturation and reproductive processes of the body.
• It stimulates the Sertoli cells of the testicles and helps in spermatogenesis, production of sperm.
• During the follicular phase, the LH and FSH increase gradually.
• They stimulate follicular development and estrogen secretion by follicular cells.

Thus, the correct answer is 'LH and FSH decrease gradually during the follicular phase.'

Hence, the Correct Answer is B

NCERT Reference: Topic “Menstrual cycle” of chapter: Human Reproduction of NCERT

• Transfer of male gametes (sperm) into the female genital tract occurs during sexual intercourse that may lead to the fertilisation of the ovum for pregnancy.
• Sexual intercourse is called coition or coitus.

Hence, the correct option is B.
NCERT Reference: topic “FERTILISATION AND IMPLANTATION” of chapter: Human Reproduction.

The correct option is A Epicotyl
Plumule- Shoot tip.

Radicle - Embryonic root.

A. Epicotyl- The portion of axis between the plumule and the cotyledonary node.

B. Hypocotyl- The portion of axis between the radicle and the cotyledonary node.

D. Coleoptile- Protective sheath of plumule.

So, the correct answer is 'Epicotyl'

Glucose ans ribose both are carbohydrates. Ribose sugar constitutes RNA nucleotides. Glucose is a hexose sugar while ribose is a pentose sugar.

Iodine can gain only one electron.
I + e^- → I^-

Atomic mass of Y = (Atomic mass of X + Atomic mass of Z)/2

81 = (37 + Z) /2

162 -37 = Z

Z = 125

Desert cooler causes cooling effect due to evaporation of water as evaporation causes cooling effect. A desert cooler works more effectively when the weather is hot and dry.

At low pressure

Explanation: Boiling occurs when the vapor pressure of a liquid equals the external pressure. At lower pressures, the boiling point of water decreases. So, if the external pressure is reduced significantly (below atmospheric pressure), water can boil at room temperature. This phenomenon can be observed in a vacuum chamber, where the pressure is significantly reduced, allowing water to boil at room temperature.

Saturated hydrocarbons contain C-C single bond and on complete combustion they produce large amounts of heat. The cooking gas used in house is Butane (C₄H₁₀) known as LPG or Methane (CH₄) known as CNG.

In order for cells to function and survive, their organelles work together to carry out specific tasks and perform specific roles. Each organelle has its own role that contributes to the survival of the cell. This is called thr Division of labour.