OSSC TGT OSSSC Science CBZ Mock Test - 9 Free Online Test 2026

Dramatisation process is a great way of learning as it involves the students in the teaching learning method.

A teacher with the proper knowledge of her subject is able to explain the concepts properly in the class. This is the main factor that determines her potential as a teacher.

A picture will be the best teaching aid to teach the subject of biology. A number of pictures can be used to teach each of the processes individually.

A lesson can be introduced in the class by using examples related to the lesson so that it is easily understandable by children. Telling stories easily attracts students and students find it easy to understand such lessons by story-telling the children like to listen to the stories. That's why teachers introduce lessons with stories.
Hence, the correct answer is "All of these".

• R-Phycoerythrin is a protein that belongs to the phycobiliprotein family and acts as an accessory pigment for photosynthesis in Rhodophyta.
• The red pigment R-phycoerythrin can absorb the blue-green spectrum of light from the deep seas along with chlorophyll-a for photosynthesis.
• In deep waters, more phycoerythrin is formed as compared to chlorophyll making the red algae look more red.

So, the correct answer is option B.

The key features of plant photosynthesis were known, namely, that plants could use light energy to make carbohydrates C₆H₁₂O₆ from CO₂ and water,  Where C₆H₁₂O₆ represents glucose.

Irreversible increase in mass or volume of plant part is called apparent growth. Apparent growth is permanent and cannot be reversed back as it occurs due to increase in cell number.

The plant shown above is cycas. This plant belongs to division cycadophyta and family cycadceae. It is diecious and native to India.

• Kelps are marine algae of class phaeophyceae.
• The body of kelp may be upto 100 metre long.
• They vary in colour from olive green to various shades of brown depending upon xanthophyll pigments.

Hence, the correct option is B.
NCERT Reference: Topic “Phaeophyceae” of chapter Plant Kingdom.

The leucoplasts are the colourless plastids of varied shapes and sizes with stored nutrients. Leucoplast includes: a) Amyloplasts storing carbohydrates. b) Elaioplastsstoring oils and fats and c) Aleuroplasts storing proteins.

A synergid cell wall forms a highly thickened structure called the filiform apparatus at the micropylar end consisting of numerous finger-like projections into synergid cytoplasm. These synergid cells are necessary for pollen tube guidance in the ovule.

Almost 25 percent of plant species are used for the production of the drugs currently sold in the market worldwide. Some plants used for the production of drugs are camphor tree, coca plant, poppy, turmeric, etc.

In angiosperms. Endosperm is a triploid (3n) structure
∴ 3n = 24, then n = 8
Root represents is the diploid structure of a plant, therefore 2n = 16

In most fungi the structural polysaccharide of cell wall is chitin. In plant cells cell wall is made up of cellulose.

Mitochondria is the site for aerobic respiration in cell and produces energy in the form of ATP. For the formation of energy different pathways like electron transport chain, kreb's cycle are involved and operated by the different enzymes. Thus, the maximum number of enzymes are found in  mitochondria. 

Mesosomes are present only in prokaryotes.

The functional layer of the human endometrium is a highly regenerative tissue undergoing monthly cycles of growth, differentiation, and shedding during a woman's reproductive years. Fluctuating levels of circulating estrogen and progesterone orchestrate this dramatic remodelling of human endometrium.

Hence, the correct option is B.
NCERT Reference: topic “MENSTRUAL CYCLE” of chapter: Human Reproduction.

• Coitus or copulation is the process that leads to the release of semen from the penis into the vagina.
• The sperms populate the vagina along with other contents of semen.
• This process is called insemination.

The less seasonal, more constant and predictable environments are the tropical environments. Due to such environmental consistency, they promote specialization in the niche and lead to a greater diversification of species.

As the size increases bond length also increases.

Representative elements in modern periodic table
The first two groups on the extreme left and last six groups on the extreme right involve the filling of s- and p- orbitals, respectively, These groups represent the main groups of the periodic table and are numbered as 1, 2, 13, 14, 15, 16, 17 and 18. The elements present in these groups are known as normal elements or representative elements.

Carbon dioxide is not a mixture since it contain fixed ratio of oxygen and carbon in 2:1, which is a property of compound not a mixture.

The correct answer is Option B.
Larger the number of unpaired electrons, the more paramagnetism it has. The correct option is [Fe(H₂O)₆]²⁺
Paramagnetic character ∝ Number of unpaired electrons. So, in this paramagnetic character is maximum in [Fe(H₂O)6]²⁺

The chemical reaction in which heat is absorbed is called the endothermic reaction. The reaction in which heat is evolved is called exothermic reaction and the reaction in which no thermal changes occur is called a thermic process. Evaporation of ether occurs due to absorption of heat by surrounding. So, it an aendothermic process.

M + O₂ -- MO₂ (super oxide)

Metal that has tendency to form super oxide : K (Potassium due to its large size)

With lithium, it forms lithium oxide. With sodium, it forms peroxide and oxide of sodium. With barium, it forms barium oxide.

The smallest alkane which can form a ring structure is a cyclopropane.

Changes of state are physical changes in matter. They are reversible changes that do not involve changes in matter’s chemical makeup or chemical properties. Common changes of state include melting, freezing, sublimation, deposition, condensation, and vaporization.

Protoplasm is a colour less material that has a living part of a cell which includes the cytoplasm, nucleus, and other organelles.
Cytoplasm is a substance which is similar to jelly and is surrounded by the nucleus within the cell membrane.

When the dispersion medium is gas, the solution is called Aerosol and when the dispersion medium is liquid, the colloidal dispersion is known as Sol. Sols can further be classified into different types depending upon the liquid used.