Sort out the animals on the basis of their symmetry
Question: Sort out the animals on the basis of their symmetry (radial or bilateral) coelenterates, ctenophores, annelids, arthropods, and echinoderms. Solution: In radial symmetry, the body of an individual can be divided into equal halves by any plans passing through the longitudinal axis. Radial symmetry: Coelenterates, Ctenophores, Echinoderms In bilateral symmetry, the body can be divided into two halves when the plane passes through the median longitudinal axis. Bilateral symmetry: Annelids...
Read More →1. Differentiate between:
Question: 1. Differentiate between: a. Open circulatory system and closed circulatory system b. Oviparous and viviparous characteristic c. Direct development and Indirect development Solution: (a) Blood is pumped out the heart and the cells and tissues are directly bathed in the open circulatory system whereas the closed circulatory system is circulated throughout the body with the help of series of vessels (b) Laying of fertilized and unfertilized eggs are known as oviparous whereas giving birt...
Read More →Match the following:
Question: Match the following: Solution: a. Octopus Tentacles b. Crocodile Limbs c. Catla Fins d. Ctenoplana Comb plates...
Read More →Evaluate the following limits:
Question: Evaluate the following limits: $\lim _{x \rightarrow 0} \frac{\sqrt{2}-\sqrt{1+\cos x}}{\sin ^{2} x}$ Solution: $=\lim _{x \rightarrow 0} \frac{\sqrt{2}-\sqrt{1+\cos x}}{\sin x \times \sin x}$ $=\lim _{x \rightarrow 0} \frac{\sqrt{2}-\sqrt{1+\cos x}}{\sin x \times \sin x} \times \frac{\sqrt{2}+\sqrt{1+\cos x}}{\sqrt{2}+\sqrt{1+\cos x}}$ $=\lim _{x \rightarrow 0} \frac{2-(1-\cos x)}{\sin x \times \sin x \times \sqrt{2}+\sqrt{1+\cos x}}$ $=\lim _{x \rightarrow 0} \frac{1-\cos x}{2 \times...
Read More →Provide appropriate technical term in the space provided.
Question: Provide appropriate technical term in the space provided. a. Blood-filled cavity in arthropods __________________________. b. Free-floating form of cnidaria _____________________________. c. Stinging organ of jelly fishes ______________________________. d. Lateral appendages in aquatic annelids ___________________. Solution: a. A blood-filled cavity in arthropods: Haemocoel b. Free-floating form of cnidaria: Medusa c. The stinging organ of jellyfishes: Nematocyst d. Lateral appendages ...
Read More →Give an example of the following
Question: Give an example of the following a. Roundworm b. Fish possessing poison sting c. A limbless reptile/ amphibian d. An oviparous mammal Solution: a. Roundworm: Ascaris b. Fish possessing poison sting: Trygon c. A limbless reptile/ amphibian: reptile Snake, Amphibian Ichthyophis d. An oviparous mammal: Duck-billed platypus...
Read More →Differentiate between a diploblastic
Question: Differentiate between a diploblastic and a triploblastic animal. Solution: Diploblastic animals are with cells arranged in two embryonic layers. Example: Coelenterates The triploblastic animal is those which the developing embryo has a third germinal layer. Example: Chordates....
Read More →Write one example each of the following in the space provided.
Question: Write one example each of the following in the space provided. a. Cold blooded animal ________________________ b. Warm blooded animal ________________________ c. Animal possessing dry and cornified skin _______________ d. Dioecious animal _____________________ Solution: a. Cold blooded animal: Frog (Amphibians) b. Warm blooded animal: Humans (Mammals) c. Animal possessing dry and cornified skin: Lizard (Reptiles) d. Dioecious animal: Ascaris (Aschelminthes)...
Read More →Evaluate the following limits:
Question: Evaluate the following limits: $\lim _{x \rightarrow 0} \frac{\sec 4 x-\sec 2 x}{\sec 3 x-\sec x}$ Solution: $=\lim _{x \rightarrow 0} \frac{\sec 4 x-\sec 2 x}{\sec 3 x-\sec x}$ $=\lim _{x \rightarrow 0} \frac{\frac{1}{\cos 4 x}-\frac{1}{\cos 2 x}}{\frac{1}{\cos 3 x}-\frac{1}{\cos x}}$ $=\lim _{x \rightarrow 0} \frac{(\cos 2 x-\cos 4 x) \times \cos x \times \cos 3 x}{(\cos x-\cos 3 x) \times \cos 2 x \times \cos 4 x}$ $=\lim _{x \rightarrow 0} \frac{2 \times \sin 3 x \times \sin x \tim...
Read More →Name the animal, which exhibits the phenomenon
Question: Name the animal, which exhibits the phenomenon of bioluminescence. Mention the phylum to which it belongs. Solution: The phenomenon of production and emission of light by an organism as a result of a chemical reaction during which chemical energy is converted to light energy is called bioluminescence. Members of the phylum ctenophores like Ctenoplana, Velamen, Beroe, etc....
Read More →Evaluate the following integrals:
Question: Evaluate the following integrals: $\int \frac{x^{6}+1}{x^{2}+1} d x$ Solution: Given: $\int \frac{x^{6}+1}{x^{2}+1} d x$ By applying: $a^{3}+b^{3}=(a+b)\left(a^{2}+b^{2}-a b\right)$ $\Rightarrow \int \frac{\left(\mathrm{x}^{2}\right)^{3}+(1)^{3}}{\mathrm{x}^{2}+1} \mathrm{dx}$ $\Rightarrow \int \frac{\left(\mathrm{x}^{2}+1\right)\left(\left(\mathrm{x}^{2}\right)^{2}+(1)^{2}-\mathrm{x}^{2} \times 1\right)}{\left(\mathrm{x}^{2}+1\right)} \mathrm{dx}$ $\Rightarrow \int \frac{\left(\mathrm...
Read More →What is the role of the radula in molluscs?
Question: What is the role of the radula in molluscs? Solution: The radula is a special structure in molluscs which is used to scrape and scratch the food and to create a depression in rocks which molluscs use as their habitat....
Read More →Mention one example each for animals with
Question: Mention one example each for animals with a chitinous exoskeleton and those covered by a calcareous shell. Solution: Chitinous exoskeleton covers the body of cockroach (Arthropods) and calcareous shell covers the body of Pila (Molluscs)....
Read More →Mention two modifications in reptiles
Question: Mention two modifications in reptiles required for terrestrial mode of life. Solution: Internal fertilization (makes the chances of the survival of young ones better). The body is covered with dry and cornified skin and epidermal scales....
Read More →Give one example each for an animal
Question: Give one example each for an animal possessing placoid scales and that with cycloid scales. Solution: Placoid scales are the tiny tough scales that cover the skin. Examples are Trygon, Pritis Cycloid scales are characterized by having a smooth outer margin. Examples are Catla, Clarias...
Read More →Which group of chordates possess sucking
Question: Which group of chordates possess sucking and circular mouth without jaws? Solution: Cyclostomes possess sucking and circular mouth without jaws. Since their mouth is circular and lacks jaws, they are also called agnathans....
Read More →What is the role of feathers?
Question: What is the role of feathers? Solution: In aves, besides pneumatic bones, feathers are also helpful in making the body weigh lighter and help in flight....
Read More →What is metagenesis?
Question: What is metagenesis? Mention an example which exhibits this phenomenon. Solution: The phenomenon of alternation of generations between sexual and asexual mode of reproduction is called metagenesis....
Read More →What is the importance of pneumatic
Question: What is the importance of pneumatic bones and air sacs in Aves? Solution: Pneumatic bones make their body lightweight and facilitate the flying and air sacs are helpful in respiration and buoyancy....
Read More →Evaluate the following limits:
Question: Evaluate the following limits: $\lim _{x \rightarrow 0} \frac{\sin 2 x+\sin 3 x}{2 x+\sin 3 x}$ Solution: $=\lim _{x \rightarrow 0} \frac{\sin 2 x+\sin 3 x}{2 x+\sin 3 x} \times \frac{3 x}{3 x}$ $=\lim _{x \rightarrow 0} \frac{\frac{\sin 2 x+\sin 3 x}{3 x}}{\frac{2 x+\sin 3 x}{3 x}}$ $=\frac{\frac{2}{3}+1}{\frac{2}{3}+1}$ $=1$ $\therefore \lim _{x \rightarrow 0} \frac{\sin 2 x+\sin 3 x}{2 x+\sin 3 x}=1$...
Read More →Identify the phylum in which adults exhibit
Question: Identify the phylum in which adults exhibit radial symmetry and larva exhibit bilateral symmetry. Solution: In the phylum Echinodermata, the radial symmetry is exhibited by the adult while the bilateral symmetry is exhibited by the larva....
Read More →Evaluate the following integrals:
Question: Evaluate the following integrals: $\int \frac{1}{\sqrt{x}}\left(1+\frac{1}{x}\right) d x$ Solution: Given: $\int \frac{1}{\sqrt{x}}\left\{1+\frac{1}{x}\right\} d x$ By multiplying $\frac{1}{\sqrt{x}}$ with inside brackets, $\Rightarrow \int\left\{\frac{1}{\sqrt{x}}+\frac{1}{\sqrt{x}} \times \frac{1}{x}\right\} d x$ $\Rightarrow \int\left\{\frac{1}{x^{\frac{1}{2}}}+\frac{1}{x^{\frac{1}{2}}} \times \frac{1}{x}\right\} d x$ $\Rightarrow \int\left\{\frac{1}{x^{\frac{1}{2}}}+\frac{1}{x^{\fr...
Read More →Match the column A with column B
Question: Match the column A with column B and choose the correct option a. A-ii, B-iii, C-v, D-iv, E-i b. A-ii, B-v, C-iii, D-iv, E-i c. A-i, B-iii, C-v, D-iv, E-ii d. A-i, B-v, C-iii, D-iv, E-ii Solution: Option (c)A-i, B-iii, C-v, D-iv, E-ii is the answer....
Read More →Evaluate the following limits:
Question: Evaluate the following limits: $\lim _{x \rightarrow 0} \frac{\sin ^{2} m x}{\sin ^{2} n x}$ Solution: $=\lim _{x \rightarrow 0} \frac{\sin m x \times \sin m x}{\sin n x \times \sin n x}$ $=\lim _{x \rightarrow 0} \frac{\frac{\sin m x \times \sin m x}{m x \times m x}}{\frac{\sin n x \times \sin n x}{n x \times n x}} \times \frac{m^{2}}{n^{2}}$ $=\frac{m^{2}}{n^{2}}$ $\therefore \lim _{x \rightarrow 0} \frac{\sin m x \times \sin m x}{\sin n x \times \sin n x}=\frac{m^{2}}{n^{2}}$...
Read More →The body cavity is the cavity present between
Question: The body cavity is the cavity present between the body wall and the gut wall. In some animals, the body cavity is not lined by mesoderm. Such animals are called a. Acoelomates b. Pseudocoelomates c. Coelomates d. Haemocoelomates Solution: Option (b) Pseudocoelomates is the answer....
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