Daily NEET MCQ- September 7, 2022 - NEET MCQ

Disposing of waste has huge environmental impacts as a certain type of wastecan be hazardous and can contaminate the environment if not handled properly. Some waste generates methane gas, which contributes to the greenhouse effect.

Biodegradable wastes are deposited in landfills and are converted into compost. These wastes mix with the soil and produce manure. Examples include paper, leaves and vegetable peels.

Recycling is the most useful method for plastic waste disposal as several waste materials can be used as raw materials to manufacture useful products again.

The hole’s circumference is made of metal. When the sheet is heated this circular circumference will expand and therefore the size of hole will increase. The hole will not get deformed as the sheet is uniform in all directions from the centre of hole and is also heated uniformly.

 The new length of first rod: I₁ = 70(1+1*10^-5*30) = 70.021cm
Similarly I₂ = 100(1+ 0.5*10^-5*30) = 100.015cm Therefore, new length = 70.021 + 100.015
= 170.036cm.

Beat frequency is equal to the difference between frequencies of interfering waves. In this case, beat frequency
= 6-2 = 4Hz.

The layer just inside the endodermis in a dicot root is called pericycle. The portion between endodermis and epidermis is covered by parenchyma cells. Secondary growth initiates from the cells of pericycle. Pith in a mono cot root is quite larger than that of a dicot root.

More xylem bundles are present in a dicot root. Conjunctive tissues are made of parenchymatic cells. Intercellular spaces are absent in endodermis. Cortex is made of parenchymatic cells.

Xylem and phloem are vascular bundles are arranged in a ring like fashion. Hypodermis is present just below the epidermis. The vascular bundles are of open type. Pith is made of parenchyma cells.

Epidermis is covered with a thin layer of cuticle and it bears few stomata and trichomes. The hypodermis is made of collenchymatous cells and is present just below the epidermis. Cortex is made of parenchymatic cells with conspicuous intercellular spaces. Endodermis of a dicot stem is also called as starch sheath as they are rich in waxy materials.