Science 2
- Which are the reasons for increasing the popularity of probiotic products? These are also milk products, but contain active bacteria e.g. Lactobacillus, Acidophilus, Lactobacillus casei, Bifidobacterium bifidum, etc... 2
- Explain the importance of biopesticides in organic farming. Some microbes-containing inoculants are produced by process of fermentation. These inoculants are sprayed on seeds before sowing and some of... 1
- How can the soil polluted by acid rain be made fertile again? Sulphuric acid is present in the acid rain and materials coming out of mines. You know that erosion of metals present in statues, bridges an... 1
- How can the oil spills of rivers and oceans be cleaned? Spilling of petroleum oil occurs in ocean due to various reasons. This oil may prove fatal and toxic to aquatic organisms. It is not easy to... 1
- Which fuels can be obtained by microbial processes? Why is it necessary to increase the use of such fuels? Natural gases such as biogas, ethane, methane can be obtained from the microbial process. It is necessary to use or increase this because it... 2
- Match the pairs ‘A’ group ‘B’ group a. Xylitol 1. Pigment b. Citric acid 2. To impart sweetness c. Lycopene 3. Microbial 'A' group 'B' group a. Xylitol 1. To impart sweetbess b. Citric acid 2. To imart acidity c. Lycopene 3. Pigment d. Nycin 4.Microbial restric... 1
- Rewrite the following statements using correct of the options and explain the completed statements. a. Process of coagulation of milk proteins occurs due to lactic acid. b. Harmful bacteria in like clostridium in the intestine are destroyed... 1
- Answer the following questions by choosing correct option. Answers: a. (1) Collar cells; b. (3) Earthworm; c. (4) Star fish; d. (4) Mammalia a. Collar cells: sponges (Porifera) have special flagellat... 1
- Body temperature of reptiles is not constant. Reptiles are cold-blooded (poikilothermic) animals: they cannot regulate their body temperature, so it changes with the temperature of the s... 1
- Balanoglossus is connecting link between non-chordates & chordates. Balanoglossus is called a connecting link because it shows some characters of non-chordates and some characters of chordates. Chordate-like... 1
- All vertebrates are chordates but all chordates are not vertebrates. All vertebrates have the basic chordate features, but some chordates (urochordates and cephalochordates) do not develop a vertebral column,... 1
- Our body irritates if it comes in contact with jelly fish. Our body gets irritated because the jellyfish has stinging cells called cnidoblasts (cnidocytes) on its tentacles, which inject a toxin into... 1
- Though tortoise lives on land as well as in water, it cannot be included in class- Amphibia. A tortoise is a reptile, not an amphibian, because it does not have the main features of class Amphibia even though it can live on land and... 1
- To which phylum does Cockroach belong? Justify your answer with scientific reasons. Cockroach belongs to the phylum Arthropoda. It shows all the features which are characteristic of this phylum: it shows the presence of join... 1
- Distinguish between butterfly and bat with the help of four distinguishing properties. Butterfly Bat 1. It belongs to the phylum Arthropoda. It belongs to the phylum Chordata and class mammalia. 2. Their characteristic feature... 1
- Write four distinguishing characters of phylum- Echinodermata. Characteristic features of Echinodermata are: they are called echinoderms because calcareous spines are present on the body of these animals... 1
- Give scientific classification of shark up to class. The classification of shark is as follows: Kingdom- Animalia Phylum- Chordata Sub- phylum- Vertebrata Class- Chondrichthyes 1
- What is the exact difference between grades of organization and symmetry? Explain with examples. Grades of organization: We know that all organisms are made up of cells out of which some organisms may be unicellular while some may be mul... 1
- Write in brief about progressive changes in animal classification. There are various scientists which have contributed to biological classification and based on their observations we have the current system... 1
- Write the characters of each of the following animals with the help of classification chart. Organism Level of organisation Symmetry Coelom Notochord Bath sponge Cellular level Asymmetrical Absent Absent Grasshopper Organ system Bila... 1
- Identify me. a. I am diploblastic & acoelomate. Which phylum do I belong to a. I belong to the phylum Cnidaria. b. I belong to the phylum Echinodermata and my name is Star fish/Asterias. c. You belong to the phylum A... 1
- Write short note on Electrical energy generation and environment. Generating electricity has effects on the environment that depend on the source used; fossil-fuel plants pollute the most, while renewable s... 1
- One solar panel produces a potential difference of 18 V and current of 3A. Connect 4 panels in series to get 72 V, and connect 3 such series strings in parallel to get 9 A. In total 12 panels are needed. Getting 72... 1
- Draw neat and labelled diagrams. a. Energy transformation in solar thermal electric energy generation. Energy transformation in solar thermal electric generation: solar energy → heat energy → kinetic energy of steam → mechanical energy of turb... 1