OSSSC TGT Science CBZ Mock Test - 6 - OTET MCQ

Intelligence is a multi-dimensional factor that involves fast response to any situation. It is the ability of an individual to learn about, learn from, understand and interact with his/her environment.

In the initial phase (energy spendling phase) of glycolysis, the hexoses (i.e., glucose and fructose) ar phosphorylated in a reaction that uses ATP at two steps : First in the conversion of glucose into glucose-6-phosphate and second in the conversion of fructose-6-phophaste to fructose-1,6-biphosphate.
These reactions are catalysed by the hexokinase and phospho-fructokinase respectively

In the majority of the plants, the first stable intermediate of carbon dioxide reduction is a three-carbon compound. Hence, this type of carbon reduction is called as C3 cycle. In C3 cycle, the initial carboxylation is brought about by RuBisCo, which carboxylates Ribulose 1,5 bisphosphate (RUBP) into phosphoglyceric acid. The phosphoglyceric acid is later on reduced to phosphoglyceraldehyde, which is used to synthesize sugars and recycle RUBP. Simple sugars like glucose and fructose are first produced. They are converted to sucrose for transportation and later on into starch for long term storage.

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.

Most of the auxins in plants are believed to be produced by apical shoot meristem.
This auxin then suppresses the growth of lateral buds, the phenomenon is called as apical dominance.
Auxins like IAA and indole butyric acid (IBA) have been isolated from plants.

Hence, option C is correct.

Heterosporous pteridophytes are a group of plants that produce two types of spores - microspores and megaspores. This is a characteristic that they share with seed plants, including gymnosperms. The seed habit refers to the production of seeds, a trait that is not present in pteridophytes but is a defining characteristic of gymnosperms.

Characteristic precursors to the 'Seed Habit'

Development of embryo inside the female gametophyte: This is the correct answer. In heterosporous pteridophytes, the female gametophyte develops within the megaspore, which remains within the parent plant. This is a precursor to the seed habit in gymnosperms, where the embryo develops within the seed that is, in turn, formed within the cone of the parent plant.

Other options provided:

• Presence of vascular tissues: While the presence of vascular tissues is a significant evolutionary trait, it is not directly linked to the evolution of the seed habit.
• External water required for fertilization: This is not a precursor to the seed habit. In fact, it's the opposite. One of the key advantages of seeds is that they allow for fertilization without the need for external water.
• Presence of embryo stage: While the presence of an embryo stage is a key feature of seed plants, it is also present in pteridophytes and hence not specific to the seed habit.

Explanation:

1. Binomial nomenclature is a system of naming organisms. It was proposed by Carl Linnaeus.
2. In binomial nomenclature, each organism has a scientific name consisting of two parts.
3. The first part is the genus and the second part is the species.
4. The first letter of the genus is written in upper case and the first letter of the species name is in lower case.
5. Both the genus and species name are written in italics, underlined if handwritten.
6. Example: Homo sapiens is the scientific name of humans, where Homo is the generic name or genus name and sapiens is the specific name or species name.

The scientific name of humans is Homo sapiens. It belongs to the genus Homo.

• Graafian follicle is the follicular stage following the first meiotic division but before ovulation.
• Each graafian follicle consists of a maturing ovum.
• It also consists of an antrum and follicular cells.

Structure of Graafian follicle:

Hence, the correct option is A.
NCERT Reference: Topic “GAMETOGENESIS ” of chapter: Human Reproduction .

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 chemical energy of food is the main source of energy required by all living organisms. This energy is transmitted to different trophic levels along the food chain. This energy flow is based on two different laws of thermodynamics:

• First law of thermodynamics, that states that energy can neither be created nor destroyed, it can only change from one form to another.
• Second law of thermodynamics, that states that as energy is transferred more and more of it is wasted.

Mitochondria are cell organelles involved in aerobic respiration. Krebs cycle occurs in the mitochondrial matrix. Krebs cycle produces reduced coenzymes which are oxidized by electron carriers of Electron Transport System or ETS to produce ATP through oxidative phosphorylation. The electron carriers of ETS are located in the inner mitochondrial membrane in eukaryotes.

More than 15,500 species worldwide is facing threat of extinction which includes amphibians, gymnosperms, reptiles, birds and mammals etc.

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).

In yeast, during fermentation, the same pathway leads to the production of ethanol(alcohol).

Correct option is B)
Peroxisomes are found in photosynthetic cells and perform photorespiration. They also take part in lipid metabolism. Lysosomes are the cell's garbage disposal system and not the peroxisomes.
So, Statement 1 is correct and statement 2 is incorrect.

Cellulose is the most abundant organic molecule present on earth. Cellulose forms the cell wall of all plant cells. Cell wall is the outermost protective layer of cell.
OR
The most abundant organic compound on Earth is cellulose, which is made up of many, many glucose molecules all linked together.

The average cell cycle span for a mammalian cell is approximately 24 hours.

Lysosomes are membrane-enclosed organelles and consist of hydrolytic enzymes which capable of breaking down all types of biological polymers (like proteins, nucleic acids, carbohydrates, and lipids). If lysosomes get ruptured in a cell, the cell dies due to release of hydrolytic enzymes which destroys the cells.

• Nuclear membrane is a double layered covering of nucleus which is separated by a perinuclear space.
• Nuclear pores allow the transfer of materials and disrupt the continuity of nuclear membrane.
• Nucleoplasm is also termed as “Karyolymph” and act as site for synthesis of DNA and RNA.
• Chromatin contains RNA, DNA, histone and non – histone proteins.

The red colour of red algae is due to abundant formation of phycoerythrin which is able to absorb blue green wavelengths of light. Being shorter, these wavelengths are able to reach the maimum depth in water. Therefore, red algae can be found in deepest ocean waters.

Higher taxonomic categories, like phylum, encompass a broader diversity of organisms, sharing more general characteristics compared to the more specific and closely related organisms grouped within lower categories like species and genus. This reflects the hierarchical nature of biological classification, where each ascending level represents a broader grouping based on less specific shared traits.

'a' Represents covalent radius which is the distance between the nuclei of two bonded atoms 'b' represents van der waals'radius which is the distance between nuclei of two closest molecules.

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

Calculate the number of moles of oxygen atoms in sucrose and water, then multiply by Avogadro's number to find the total number of oxygen atoms.