Science
- 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
- 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
- Distinguish between monocots and dicots. Dicots Monocots Seed Two cotyledons Single cotyledon Root Well developed, primary root (Taproot) Fibrous roots Stem Strong, hard. e.g. Banya... 1
- Write the characteristics of subkingdom Phanerogams. Plants which have special structures for reproduction and produce seeds are called Phanerogams. In these plants, after the process of reprod... 1
- Complete the sentences by filling in the blanks and explain those statements. a. Thallophyta plants have soft and fibre-like body. b. Bryophyta is called the 'amphibian' of the plant kingdom. c. In pteridophytes, asexu... 1
- Match the proper terms from columns A and C with the description in column B. A B C Thallophyta These plants mainly grow in water Algae Bryophyta These plants need water for reproduction Moss Pteridophyta Tissues are p... 1
- Classify aqueous solutions of the following substances according to their pH into three groups : 7, more than 7, less Substances pH Value Common salt equal to 7 Sodium acetate greater than 7 Hydrochloric acid less than 7 Carbon dioxide less than 7 Potassium... 1
- state the difference Negative electrode and positive electrode. Negative Electrode Positive Electrode Refers to a piece of electrochemical cell that is the negative pole Refers to a piece of electrochemic... 1
- State the differences. Cation and anion Cations Anions Positively charged particles Negatively charged particles Formed by loss of electrons from metals Formed by gain of electrons... 1
- State the differences. 1. Acids and bases Acid Base Substance which when dissolved in water gives hydrogen ion Substance which when dissolved in water can accept hydrogen ions Substa... 1