Doubtly
@Doubtly · Joined Feb 2021
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- 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
- 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
- Sketch and label the figures of the following plants and explain them into brief. Marchantia, Funaria, Fern, Spirogyra. a) Marchantia: It belongs to the division Bryophyta and subkingdom cryptograms. These plants grows in damp ground and on the wall in the rai... 1
- Write the characteristics of the plants belonging to division Bryophyta. Bryophyta group of plants are called the amphibians of the plant kingdom because they grow in moist soil but need water for reproduction. Th... 1
- Sketch, label and describe the Spirogyra. Spirogyra is free floating green algae mainly found in fresh water . It has a filamentous structure. It has spiral shape chloroplast. They c... 1
- Write a paragraph in your own words about the ornamental plants called ferns. Ferns belong to the group of plants called Pteridophyta. They have well-developed roots, stem and leaves but do not bear flowers and fruits.... 1