9th
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- Why are naphthalene balls kept with cloths to be put away. Naphthalene balls are kept with cloths because when they kept in cloths sublime slowly and after sublimation there will be no residue left.... 1
- Foam accumulates on the surface of ‘dal’ kept for long time in summer. Answer: Because microbes (bacteria and fungi) grow in the dal and ferment it, producing gases such as carbon dioxide, which form foam. Cooke... 1
- Identify the odd word out and say why it is the odd one. a) Pneumonia, diphtheria, chicken pox, cholera. Odd word: Chicken pox Because chicken pox is a viral disease while all the other are bacteri... 2
- Write the names of the microbes found in the following food materials. Yoghurt- Lactobacillus Bread -Saccharomyces Root nodules of Leguminous plants - Rhizobium Idli - lactobacillus Dosa - Lactobacillus Spoiled... 1
- Complete the statement using the proper option from those given below. (Mycotoxins, budding, Rhizobium) a) Yeast reproduces asexually by the budding b) Toxins of fungal origin are called mycotoxins. c) Leguminous plants can produce more protein... 1
- What are the differences between flow of matter and of energy in an ecosystem? Why? The major difference between flow of matter and of energy is that the flow of matter occurs in a cyclic manner i.e. it is recycled, however,... 3
- What type of changes occur in the amount of energy during its transfer from plants to apex consumers? (1) Green plants of the ecosystem store large amount of energy in the form of carbohydrates and proteins. (2) Before reaching the decomposer... 1
- State the different types of bio-geochemical cycles and explain the importance of those cycles. The cyclical flow of nutrients within an ecosystem is called the bio-geo-chemical cycle. There are various bio-gio-chemical cycles operating... 1
- Explain in detail the inter-relationship between the food chain and food web. Interaction go on continuously between producers, consumers and decomposers. There is a definite sequence in these interactions which is cal... 1
- What would you do to help maintain the equilibrium in the various bio-geo-chemical cycles? Explain in brief. The cyclical flow of nutrients within an ecosystem is called the bio-geo-chemical cycle. Climatic changes and human activities seriously aff... 1
- Oxygen cycle Explain the following cycles in your own words with suitable diagrams. Oxygen forms 21% of the atmosphere. It is also present in the hydrosphere and lithosphere. Circulation and recycling of oxygen within the bi... 1
- Nitrogen cycle Explain the following cycles in your own words with suitable diagrams. Nitrogen forms 78% i.e. the maximum portion of the atmosphere. It is necessary for the maintenance of the cycle of nature. The circulation a... 1
- Carbon cycle Explain the following cycles in your own words with suitable diagrams. Carbon cycle Carbon enters life forms through the process of photosynthesis. During photosynthesis, carbon dioxide and water combine to prod... 1
- Flow of nutrients through an ecosystem is cyclic. give reason Flow of nutrients through an ecosystem is cyclic as the nutrients move from one trophic level to another trophic level all the way up and th... 1
- Equilibrium is necessary in the various bio-geo-chemical cycles. give reason The cyclic flow of nutrients within an ecosystem is called as the bio-geochemical cycle. A continuous transfer of nutrients which are necess... 1
- Give reasons Energy flow through an ecosystem is ‘one way’. Sun is ultimate source of energy. The producers convert solar energy into chemical energy in the form of organic compounds. The primary cons... 2
- Correct and rewrite the following statements and justify your corrections. 1. Carnivores occupy the second trophic level in the food chain. Answer Correction-Carnivores occupy the third trophic level in the food cha... 1
- Complete the following table (Carefully study the carbon, oxygen and nitrogen cycles) Bio-geo-chemical cycles Biotic processes Abiotic processes 1. Carbon cycle Photosynthesis -Release of oxygen and Respiration - Release of ox... 2
- How have living organisms been classified? (i) Organisms have been classified based on the following: Cell structure Body Organisation Mode of nutrition Reproduction (ii) Organisms ar... 1
- Collect photographs of 5 plants each of the Thallophyta, Bryophyta and Pteridophyta divisions and write a Thallophyta is a division of the plant kingdom including primitive forms of plant life showing a simple plant body. Batra, Ulva, Chara, Ulot... 1
- Prepare an album of moncot and dicot seeds and display it in the classroom.
- Collect more information about plant classification from the internet, prepare a talk of about 5 to 7 minutes
- Which criteria are used for the classification of plants? Explain with reasons. The presence or absence of organs. The presence or absence of separate conducting tissues for conduction of water and food Do the plants bea... 1
- Collect a monocot and dicot plant available in your area. Observe the plants carefully and describe them in scientific Monocots: It’s embryo has only one cotyledon in seed. The petals of monocot are in the form of multiples of three. Stem vascular bundles are... 1