Which tissue of animals and plants
Question: Which tissue of animals and plants exhibits meiosis? Solution: Germ cells present in the reproductive tract undergo meiosis to produce gametes....
Read More →Name a stain commonly used
Question: Name a stain commonly used to colour chromosomes. Solution: To make the chromosomes visible the cell is stained with Acetocarmine and mounted in acetocarmine only....
Read More →Which of the phases of the cell cycle
Question: Which of the phases of the cell cycle is of longest duration? Solution: Interphase. In a 24-hour cell cycle, 23 hours are for I-phase and 1 hour for M phase....
Read More →Between a prokaryote and a eukaryote,
Question: Between a prokaryote and a eukaryote, which cell has a shorter cell division time? Solution: Prokaryotes take a shorter time for cell division....
Read More →Find the derivation of each of the following from the first principle:
Question: Find the derivation of each of the following from the first principle: $\frac{1}{\sqrt{2 x+3}}$ Solution: Let $f(x)=\frac{1}{\sqrt{2 x+3}}$ We need to find the derivative of f(x) i.e. f(x) We know that, $f^{\prime}(x)=\lim _{h \rightarrow 0} \frac{f(x+h)-f(x)}{h}$ (i) $f(x)=\frac{1}{\sqrt{2 x+3}}$ $\mathrm{f}(\mathrm{x}+\mathrm{h})=\frac{1}{\sqrt{2 \mathrm{x}+2 \mathrm{~h}+3}}$ Putting values in (i), we get $f^{\prime}(x)=\lim _{h \rightarrow 0} \frac{\frac{1}{\sqrt{2 x+2 h+3}}-\frac{1...
Read More →Select the correct statement about G1 phase
Question: Select the correct statement about G1 phase a. The cell is metabolically inactive b. DNA in the cell does not replicate c. It is not a phase of synthesis of macromolecules d. Cell stops growing Solution: Option (b) DNA in the cell does not replicate is the answer....
Read More →Identify the wrong statement about meiosis
Question: Identify the wrong statement about meiosis a. The pairing of homologous chromosomes b. Four haploid cells are formed c. At the end of meiosis, the number of chromosomes is reduced to half d. Two-cycle of DNA replication occurs Solution: Option (d)Two-cycle of DNA replication occursis the answer....
Read More →Which of the events listed below
Question: Which of the events listed below is not observed during mitosis? a. Chromatin condensation b. Movement of centrioles to opposite poles c. The appearance of chromosomes with two chromatids joined together at the centromere. d. Crossing over Solution: Option (d)Crossing over is the answer....
Read More →Cells which are not dividing
Question: Cells which are not dividing are likely to be at a. G1 b. G2 c. Go d. S phase Solution: Option (c)Go is the answer....
Read More →Evaluate:
Question: Evaluate: $\int \cos ^{2} \frac{\mathrm{x}}{2} \mathrm{dx}$ Solution: We know, $\cos ^{2} x=\frac{1+\cos 2 x}{2}$ $\therefore$ The given equation becomes, $\Rightarrow \int \frac{1+\cos 2 \frac{x}{2}}{2} d x=\int \frac{1+\cos x}{2} d x$ We know $\int \cos a x d x=\frac{1}{a} \sin a x+c$ $\Rightarrow \frac{1}{2} \int \mathrm{dx}+\frac{1}{2} \int \cos (\mathrm{x}) \mathrm{dx}$ $\Rightarrow \frac{x}{2}+\frac{1}{2} \sin (x)+c$...
Read More →A bivalent of meiosis-I consists of
Question: A bivalent of meiosis-I consists of a. Two chromatids and one centromere b. Two chromatids and two centromere c. Four chromatids and two centromere d. Four chromatids and four centromere Solution: Option (c)Four chromatids and two centromere is the answer....
Read More →Mitosis is characterised by
Question: Mitosis is characterised by a. Reduction division b. Equal division c. Both reduction and equal division d. Paining of homologous chromosomes Solution: Option (b)Equal division is the answer....
Read More →Meiosis occurs in organisms during
Question: Meiosis occurs in organisms during a. Sexual reproduction b. Vegetative reproduction c. Both sexual and vegetative reproduction d. None of the above Solution: Option (a)Sexual reproductionis the answer....
Read More →Find the derivation of each of the following from the first principle:
Question: Find the derivation of each of the following from the first principle: $\frac{1}{\sqrt{x+2}}$ Solution: Let $f(x)=\frac{1}{\sqrt{x+2}}$ We need to find the derivative of f(x) i.e. f(x) We know that, $f^{\prime}(x)=\lim _{h \rightarrow 0} \frac{f(x+h)-f(x)}{h}$ (i) $f(x)=\frac{1}{\sqrt{x+2}}$ $f(x+h)=\frac{1}{\sqrt{x+h+2}}$ Putting values in (i), we get $f^{\prime}(x)=\lim _{h \rightarrow 0} \frac{\frac{1}{\sqrt{x+h+2}}-\frac{1}{\sqrt{x+2}}}{h}$ $=\lim _{h \rightarrow 0} \frac{\frac{\sq...
Read More →Evaluate:
Question: Evaluate: $\int \sin ^{2} \frac{x}{2} d x$ Solution: $\sin ^{2} x=\frac{1-\cos 2 x}{2}$ $\therefore$ The given equation becomes, $\Rightarrow \int \frac{1-\cos 2 \frac{x}{2}}{2} \mathrm{dx}=\int \frac{1-\cos x}{2} \mathrm{dx}$ We know $\int \cos a x d x=\frac{1}{a} \sin a x+c$ $\Rightarrow \frac{1}{2} \int d x-\frac{1}{2} \int \cos (x) d x$ $\Rightarrow \frac{x}{2}-\frac{1}{2} \sin (x)+c$...
Read More →At which stage of meiosis does the genetic constitution
Question: At which stage of meiosis does the genetic constitution of gametes is finally decided a. Metaphase I b. Anaphase II c. Metaphase II d. Anaphase I Solution: Option (d) is the answer....
Read More →Evaluate:
Question: Evaluate: $\int \sin ^{2} \mathrm{~b} \mathrm{x} \mathrm{dx}$ Solution: $\sin ^{2} x=\frac{1-\cos 2 x}{2}$ $\therefore$ The given equation becomes, $\Rightarrow \int \frac{1-\cos 2 \mathrm{~b}}{2} \mathrm{dx}$ We know $\int \cos a x d x=\frac{1}{a} \sin a x+c$ $\Rightarrow \frac{1}{2} \int \mathrm{dx}-\frac{1}{2} \int \cos (2 \mathrm{~b}) \mathrm{dx}$ $\Rightarrow \frac{x}{2}-\frac{1}{4 \mathrm{~b}} \sin (2 \mathrm{bx})+\mathrm{c}$...
Read More →Meiosis results in
Question: Meiosis results in in diploid organisms a. Production of gametes b. Reduction in the number of chromosomes c. Introduction of variation d. all of the above Solution: Option (d)all of the above is the answer....
Read More →Evaluate:
Question: Evaluate: $\int \cos ^{4} 2 x d x$ Solution: $\cos ^{4} 2 x=\left(\cos ^{2} 2 x\right)^{2}$ $\Rightarrow \cos ^{2} x=\frac{1+\cos 2 x}{2}$ $\Rightarrow\left(\cos ^{2} 2 x\right)^{2}=\left(\frac{1+\cos 4 x}{2}\right)^{2}$ $\Rightarrow\left(\frac{1+\cos 4 x}{2}\right)^{2}=\left(\frac{1+2 \cos 4 x+\cos ^{2} 4 x}{4}\right)$ $\Rightarrow \cos ^{2} 4 x=\frac{1+\cos 8 x}{2}$ $\Rightarrow\left(\frac{1+2 \cos 4 x+\cos ^{2} 4 x}{4}=\frac{1}{4}+\frac{\cos 4 x}{2}+\frac{1+\cos 8 x}{8}\right)$ Now ...
Read More →Find the derivation of each of the following from the first principle:
Question: Find the derivation of each of the following from the first principle: $\sqrt{5 x-4}$ Solution: Let $f(x)=\sqrt{5 x-4}$ We need to find the derivative of f(x) i.e. f(x) We know that, $f^{\prime}(x)=\lim _{h \rightarrow 0} \frac{f(x+h)-f(x)}{h}$ (i) $f(x)=\sqrt{5 x-4}$ $f(x+h)=\sqrt{5(x+h)-4}$ $=\sqrt{5 x+5 h-4}$ Putting values in (i), we get $\mathrm{f}^{\prime}(\mathrm{x})=\lim _{\mathrm{h} \rightarrow 0} \frac{\sqrt{5 \mathrm{x}+5 \mathrm{~h}-4}-\sqrt{5 \mathrm{x}-4}}{\mathrm{~h}}$ N...
Read More →Describe various forms of lipid
Question: Describe various forms of lipid with a few examples. Solution: Lipids are classified into three categories: Simple lipids, compound lipids and derivatives. Simple lipids are the esters of fatty acids eg: Triglycerol, fats and wax Compound lipids are with an additional group other than fats and alcohols. An example is phospholipids, glycolipids When lipids consist of hydrocarbon ring and the long chain of hydrocarbons they are called derivatives Examples of Steroids, Cholesterol....
Read More →What are the different classes of enzymes?
Question: What are the different classes of enzymes? Explain any two with the type of reaction they catalyse. Solution: There are different classes of enzymes. They are Oxidoreductase, Transferase, Hydrolase, Lysates, Isomerase, ligases. (a) Oxidoreductase: These are the enzymes which help in simultaneous oxidation and reduction of two substrates. S reduced + Sreduced S oxidized + S oxidized (b) Hydrolases: These enzymes facilitate the hydrolysis of a molecule. Sucrose Glucose + Fructose...
Read More →Evaluate:
Question: Evaluate: $\int \sin ^{3}(2 x+1) d x$ Solution: We know $\sin 3 x=-4 \sin ^{3} x+3 \sin x$ $\Rightarrow 4 \sin ^{3} x=3 \sin x-\sin 3 x$ $\Rightarrow \sin ^{3} x=\frac{3 \sin x-\sin 3 x}{4}$ $\Rightarrow \int \sin ^{3}(2 \mathrm{x}+1) \mathrm{d} \mathrm{x}=\int \frac{3 \sin (2 \mathrm{x}+1)-\sin 3(2 \mathrm{x}+1)}{4} \mathrm{dx}$ $\Rightarrow$ We know $\int \sin a x d x=\frac{-1}{a} \cos a x+c$ $\Rightarrow \frac{3}{8} \int \sin (2 x+1) d x-\frac{1}{4} \int \sin (6 x+3) d x$ $\Rightarr...
Read More →Formation of the enzyme-substrate complex (ES)
Question: Formation of the enzyme-substrate complex (ES) is the first step in catalysed reactions. Describe the other steps until the formation of the product. Solution: 1. In the first step, the substrate binds to the active site of the enzyme which fits into the active site 2. The binding of the substrate will help the enzyme to alter its shape and will fit more tightly 3. The active site of the enzyme breaks the chemical bond of the substrate thus forming a new enzyme product 4. The product w...
Read More →Comment on the statement “living state is a non-equilibrium
Question: Comment on the statement living state is a non-equilibrium steady-state to be able to perform work. Solution: In a biological system, metabolic reactions always remain on and influx and efflux of metabolites take place constantly, hence it can be said that living state is a non-equilibrium steady state which can perform work....
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