Optical Efficiency of Low-Concentrating Solar Energy Systems with ...

Admin 2004

Description

• dissertation

Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 934 Optical Efficiency of Low-Concentrating Solar Energy Systems with Parabolic Reflectors BY MARIA BROGREN ACTA UNIVERSITATIS UPSALIENSIS UPPSALA 2004

• measurements of the optical efficiency
• solar energy systems
• photovoltaic systems for facade-integration
• photovoltaic cells
• reflector materials
• various methods
• parabolic reflectors
• optical properties
• solar cells

Sujets

• Dissertation
• Ribbing (knitting)
• Malmström
• Hansson
• Nostell
• Bühler

Informations

• Publié par: nachig
• Nombre de lectures: 29
• Langue: English

Extrait

BAL BHARATI PUBLIC SCHOOL, PITAMPURA, DELHI110034  SCIENCE  COREASSIGNMENT  NUTRITIONIN PLANTS  CLASS7 Q1 Define the following terms 1 NutritionIt is the mode of taking food by an organism and its utilization by the body. 2 Autotrophic NutritionThe mode of nutrition in which organisms make food themselves from simple substances is called autotrophic nutrition 3Hetrotrophic NutritionThe mode of nutrition in which organisms depends on others for their food is called hetrotrophic nutrition. 4PhotosynthesisIt is the process by which green plants can prepare theirown food in the presence of sunlight,carbondiooxide,water,minerals and chlorophyll. Q2 How are water and minerals absorbed by roots reach the leaves? A Waterand minerals are transported to the leaves by the vessels which run like pipes throughout the root,stem,branches and leaves. Q3 List down the requirements of photosynthesis? A 4requirements of photosynthesis are 1 carbondioxide–is taken through stomatas 2 waterand minerals are transported to the leaves by the vessels. 3 chlorophyllispresent in the leaves of the plants. 4 sunlightisabsorbed by the chlorophyll present in the leaves. Q4 Can spirogyra prepare its own food.If yes how? A Spirogyracan prepare its own food with the help of chlorophyll. Q5 In what form plants prepared ands stored their food? A Plants prepared their food in the form ofsugar and stored in form of starch. Q6 Define the term hetrotrophic nutrition. A It is a type of nutrition in which organisms depend on others for their food.eg rat Q7 Differentiate between a)parasites and saprophytes

b) parsite and host Parasites Parasites are those organisms which feed on living organisms for the food egCuscuta PARASITES

Saprophytes Saprophytes are those organisms which feed on dead decayed organic matter.eg bacteria

HOST

Are those organisms which feed on host.Host are those organisms from which 2) they are always benefittedparasite obtain food . 2) they are at loss. Q8 What are insectivorous plants?How do they obtain their food? A Insectivorous plants are those plants which eat insects. Q9 How does pitcher plant obtain their food? A Inpitcher plant pitcher like structure is the modified part of the leaf.The apex of the leaf forms a lid which can open and close the mouth of the pitcher.Inside the pitcher there are hair which are directed downwards.When an insect lands in the pitcher ,the lid closes and the trapped insects gets entangled into the hair.The insect is digested by the digestive juices secretedin the pitcher. Q10 Identify the mode of nutrition in the following a)Cuscuta Parasitic mode of nutrition b)Mushroomsaprophytic mode of nutrition c)Spirogyra Autotrophic mode of nutrition Q11What is symbiotic relationship? A Some organisms live together and share shelter and nutrients.This is called symbiotic relationship. Q12 Name two commonly growing saprophytes. A Twocommonly growing saprophytes are  Bacteria,fungi. Q13 How do saprophytes obtain nutrition? A They secrete digestive juices on the dead decayed and decaying matter and convert it into solution.Then they absorb the nutrients from it. Q14 How nutrients are replenished in the soil? A Nutrientsare replenished in the soil IN THE FOLLOWING WAYS

1 Fertilizers 2 Manures 3 Rhizobium Q15 How does Rhizobium help a farmer? A Rhizobium is abacteria that lives in the root nodules of leguminous plants like pea,moong,beans .It takes atmospheric nitrogen and convert it into a soluble form which is then utilized by plants. Q16Lichens exhibit symbiotic relationship.Comment. A In lichens algae and fungus live together.The fungus provides shelter ,water and minerals to the alga and in return the alga provides food which it prepares by photosynthesis. Q17 Draw a well labeled diagram of cross section of leaf .

Q 18 Draw a well labeled diagram of stomata.