OSSSC TGT Science CBZ Mock Test - 6 - OTET MCQ

Factor 'g' is associated with intelligence. This factor was first proposed by Charles Spearman.

Educational psychology is related with the study of the learning process in humans. So, the potentiality of a student can be known by the teacher through educational psychology.

For studying a map, the knowledge of distances, places and directions are very important. So, if a teacher has the knowledge of these factors, she can easily make the students understand maps.

Nowadays, TV is very common and well recognised. It is considered better than radio for learning purpose as it utilises two senses, i.e. hearing and vision at the same time, prompting a more exact type of learning.

The primary reason for this is that She may not be able to deal with a sudden emotional outburst. 
Nervousness is the result of the stress response. Through nervousness, the body releases the stressor. This process involves a series of hormonal and physiological responses that cause nervousness.
Hence, the correct answer is, 'She may not be able to deal with a sudden emotional outburst.'

C4 plants are adapted to hot and dry climate regions. Sugarcane, Maize, Sorghum, etc., are the examples of C4 plants. In these plants, the Calvin cycle occurs in the bundle-sheath cells. C4 plants have a special type of anatomy called Kranz anatomy. They can tolerate higher temperatures because of Kranz anatomy. 'Kranz' means wreath and is a reflection of the arrangement of cells. Kranz anatomy is characterized by having a large number of chloroplasts, grana are absent, thick walls impervious to gaseous exchange and no extracellular spaces.

Sequoia is one of the gymnosperms and is renowned for being one of the tallest tree species.

Fig: Sequoia

• The other pathway, non-cyclic photophosphorylation, is a two-stage process involving two different chlorophyll photosystems. Being a light reaction, non-cyclic photophosphorylation occurs in the thylakoid membrane. First, a water molecule is broken down into 2H⁺ + 1/2 O₂ + 2e⁻ by a process called photolysis (or light-splitting).
• The two electrons from the water molecule are kept in photosystem II, while the 2H⁺and 1/2O₂ are left out for further use. Then a photon is absorbed by chlorophyll pigments surrounding the reaction core centre of the photosystem.
• The light excites the electrons of each pigment, causing a chain reaction that eventually transfers energy to the core of photosystem II, exciting the two electrons that are transferred to the primary electron acceptor, phaeophytin.

Fixing of one molecule of carbon dioxide in Calvin cycle require 3 ATP and 2 NADPH₂ as the source of energy. One NADPH₂ molecule produces 3 molecules of ATP.

The term auxin has been derived from the Greek word “auxein” which means “to grow”. It is known to be the first plant hormone that was discovered.

• Auxins are a group of compounds that include indole-3-acetic acid (IAA), and other natural and synthetic compounds that have certain growth-regulating properties. They are one of the various plant growth regulators(PGRs). They are generally produced by the growing apices of the stems and roots; from where they migrate to the other regions of their action. Auxins can be natural or synthetic. Indole Acetic Acid(IAA) and indole butyric acid (IBA) are some natural auxins that have been isolated from plants.
• Some synthetic auxins include NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic) which are used for various purposes.

Functions:

• Physiological:
  • Cell Elongation: Auxin promotes elongation and growth of stems and roots and enlargement of fruits by overall enlargement of cells in all directions,
  • Apical Dominance: In many plants, the apical bud grows while the lower axillary buds are suppressed. This is an effect of the auxin(IAA) of the axillary bud. This can be proven but removing the apical bud which then results in the growth of lateral buds.
  • Control abscission layer: Auxin inhibits the abscission of young leaves and fruits in normal amounts. An abscission layer is produced only when the auxin content is reduced below the minimum level which ultimately leads to the fall of ripe fruits.

There are many other uses:

• Rooting: Auxin stimulates root formation in woody stem cuttings.
• Flowering: The dilute solutions of synthetic auxins are sprayed on fruits like litchi and pineapple which induce flowering in them. However, in most plants, flowering will be inhibited by spraying a high concentration of auxins.
• Parthenocarpy: Auxins in diluted form can be used to produce parthenocarpic or seedless fruits. It has been proven that naturally parthenocarpic fruits like bananas and grapes have higher internal production of auxins.
• Weedicides: Spraying synthetic auxins like 2,4-D is a procedure commonly used as weedicides. They are used to remove many broad-leaved weeds or dicotyledonous weeds while sparing the monocot plants.
• Except for auxin, there are four other plant hormones called gibberellins, cytokinin, abscisic acid, and ethylene. Together they are called Plant Growth Regulators (PGRs). Some of them cause the plants to grow, while others like abscisic acid promote senescence. i.e. promote falling of leaves and fruits. Ethylene is the only gaseous hormone.

Development is a term that includes all changes that an organism goesthrough during its life cycle from germination of the seed to senescence.

The pollen tubes enter the embryo-sac where two male gametes are discharged. One of the male gametes fuses with the egg cell to form a zygote (syngamy). The other male gamete fuses with the diploid secondary nucleus to produce the triploid primary endosperm nucleus (PEN).

Cycas is classified as a gymnosperm due to the presence of its ovule which is naked . All gymnosperms produce naked seed due to the naked ovule, which distinguishes them from angiosperms.

Fig: Cycas
Hence, the correct option is C.
NCERT Reference: Topic “GYMNOSPERMS” of chapter Plant Kingdom.

• Four electrons and four protons are produced at the end of the photolysis of water.
• Two molecules of water get converted into 4H⁺ and 4e^– along with free oxygen.
• The ions used for this splitting is Mn²⁺, Ca²⁺, and Cl^–.

Alcoholic fermentation is respiration in absence of oxygen. In this, hexose molecule is converted into ethyl alcohol and CO₂, with the activity of enzyme 'zymase' produced by yeast.

RQ slightly more than unity is found when organic acids are broken down as respiratory substrates under aerobic conditions, e.g., for breakdown of oxalic acid,

• Ectotherms are so-called cold-blooded animal that is any animal whose regulation of body temperature depends on external sources, such as sunlight or a heated rock surface.
• The ectotherms include the fishes, amphibians, reptiles, and invertebrates.
• The body temperatures of aquatic ectotherms are usually very close to those of the water.
• Ectotherms do not require as much food as warm-blooded animals (endotherms) of the same size, but most cannot deal as well with cold surroundings.

• The corpus luteum is a temporary endocrine structure in female mammals that is involved in the production of high amounts of progesterone.
• The corpus luteum develops from an ovarian follicle present in the ovary during the luteal phase of the menstrual cycle. Once, the secondary oocyte is released from the follicle during ovulation, it results in the formation of corpus luteum.

Corpus Lectum:

Hence, the Correct Answer is A

Amino acids are organic compounds containing an amino group and an acidic group as substituents on the same carbon, i.e. the α-carbon. Hence, they are called α-amino acids.

The statement in
Assertion (A) is true, as prokaryotes have a single plasma membrane that surrounds the cell, which serves as the envelope.

However, the statement in
Reason (R) is incorrect. Although prokaryotes lack a true nucleus and other membrane-bound organelles, they still have internal membranes, such as the cell membrane and the membranes surrounding some of their internal structures. Therefore, there are multiple membranes present in prokaryotic cells.

For greater efficiency a food chain must have three to four trophic levels. At each trophic levels loss of energy is very high so very small amount of energy is left after there trophic level.

• Non motile pollen grains are carried to the female gamete via a pollen tube which extends from the stigma, all the way through the style, reaching the ovaries.
• Wind, water, insects, etc. are just ways of mode of transportation for cross pollination.

Only 10 % of energy is transferred from one trophic level to the next trophic level of a food chain (ten percent law, given by Linderman). In present case, energy available at producer level is 10 J. Hence energy at primary consumer level would be 1 H (10% of 10 J). Similarly, at secondary consumer level, energy present will be 0.1 J (100 % of 1 J).

Semen passes from the ejaculatory duct to the exterior of the body via urethra. The urethra passes through the prostate glands and ends at the external urethral orifice.

Z = 79 [Xe]4f¹⁴5d^10.6s¹ (n = 6)
As n = 6, the element belongs to 6^th period.
Group = ns + (n - I)d, I + 10 = 11

The difference between the Nobel gases is 2, 8,8,18,18 this is a way for learning the atomic no only if we didn't remember for ex He -2 Ne -2+8=10 Ar-2+8+8 =18 kr -2+8+8+18=36 xe - 2+8+8+18+18=54 Rn - 2+8+8+18+18+32=86 in this we can learn the atomic no of elements , which helps us in electronic configuration of the atom which are above the no.30

• CaCl: Incorrect. Calcium chloride is CaCl₂ because calcium forms a 2+ ion and chloride forms a 1- ion, needing two chloride ions to balance the charge.
• BiPO₄: Correct. Bismuth phosphate is BiPO₄. Bismuth typically forms a 3+ ion, and the phosphate ion is PO₄^3-, balancing the charges.
• NaSO₄: Incorrect. Sodium sulfate is Na₂SO₄. Sodium forms a 1+ ion, so two are needed to balance the 2- charge of sulfate.
• NaS: Incorrect. Sodium sulfide is Na₂S. Sulfur forms a 2- ion, so two sodium ions are needed to balance the charge.