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Prove that (sec A + tan A) (1 – sin A) = cos A

Answer: To prove (sec A + tan A) (1 - sin A) = cos A Consider LHS and substitute the above value in the equation we get ⇒ ⇒... View Article

Each edge of a cube is increased by 50%. Find the percentage increase in the surface area of the cube.

Answer: Let x be the edge of a cube.Surface area of the cube having edge x = 6x2 ………..(1) As given, a new edge after increasing the existing... View Article

Give some examples of each monocot and dicot seeds.

Answer: Monocotyledon is a classification of flowering plants, it is characterized by only one embryonic leaf. Examples: Corn Wheat Maize Rice... View Article

Choose the forms in which most plants absorb nitrogen (i) Proteins (ii) Nitrates and Nitrites (iii) Urea (iv) Atmospheric nitrogen. Choose: (1) (i) and (ii) (2) (ii) and (iii) (3) (iii) and (iv) (4) (i) and (iv)

Answer: (2) (ii) and (iii) Nitrogen is an essential nutrient for plant growth, development, and reproduction. The biological method occurs in... View Article

The resistance to fatigue of a material is measured by (1) Elastic limit (2) Ultimate tensile strength (3) Young’s modulus (4) Endurance limit.

Answer: The resistance of a material to fatigue is measured by the endurance limit. The fatigue of a substance is the stress or pressure it... View Article

Which one of the following soil ideal for growing cotton (1) regular soil (2) laterite soil (3) desert soil (4) mountainous soil

Answer: (2) laterite soil Laterite soil are soft, when they are wet and ‘hard and cloddy’ on drying. These are found mainly in the... View Article

Write a note on carbon compounds in everyday use.

Answer: Carbon is life’s fundamental building stone. This is why carbon dating is reliable and carbon is found in all living things.... View Article

Write the difference between a reflex action and walking.

Answer: The differences between reflex action and walking are tabulated below. Reflex action Walking Reflex activity is a spontaneous... View Article

What are stilt roots and pneumatophores?

Answer: Stilt roots are adventitious roots that grow from lower stem nodes and join and become deeper in the soil. Plants are covered from... View Article

The number to be added is called ______

Answer: The result is called a sum when two numbers are added together. The two numbers added together are known as addends. Example: 6 + 8 =... View Article

What is Epiblema?

Answer: The imperfectly shaped epidermis of Epiblema provides the position of the true epidermis in submerged plants and on the limbs of... View Article

Use suitable identity to find the product of (x + 8) (x-10)

Answer: An algebraic expression in mathematics is an expression that is made up of variables and constants, along with algebraic operations like... View Article

Find the sum of all odd numbers between 0 and 50.

Answer: Odd numbers are classified as any number that is not divisible by two. In other terms, a number in the form of 2k+1, where k ∈... View Article

Give an example of sieving.

Answer: Based on the difference in particle size, sieving is a separation process. It is the sieve is responsible for retaining the larger... View Article

What is the prime factorization of the number 8, 788?

Answer: Prime factorization is a method to find the prime factors of a given number, say a composite number. These factors are nothing but the... View Article

What is the formula of sodium zincate?

Answer: The formula of sodium Zincate is Na2ZnO2. Depending on the conditions, sodium zincate relates to anionic zinc oxides or hydroxides. The... View Article

The only cell organelle seen in a prokaryotic cell is (1) Mitochondria (2) Ribosomes (3) Plastids (4) Lysosomes

Answer: (2) Ribosomes The two distinct forms of cells are prokaryotes and eukaryotes. Eukaryotic cells contain organelles that are... View Article

What is the full form of PET in science?

Answer: Full form of PET is Polyethylene terephthalate. For improved resistance, the material is moulded into the specified form and then... View Article

Water from the undigested food is absorbed mainly in the (1) Stomach (2) Foodpipe (3) Small intestine (4) Large intestine

Answer: (4) Large intestine The large intestine is a long, thick tube that measures about 5 feet in length. Just under the stomach, it is found... View Article

Organelle other than nucleus, containing DNA is (1) endoplasmic reticulum. (2) Golgi apparatus (3) Mitochondria (4) Lysosome

Answer: (3) Mitochondria The mitochondria are the organelle other than the nucleus comprising the DNA. The mitochondria incorporate nucleic... View Article

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