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Level 0 Worksheet: Our Environment

Class: 10 Science Topic: Ecology Basics Max. Questions: 50
Name:
Date:
Section A: Fill in the Blanks

Q1-10. Complete the sentences:

  1. Green plants are called __________ because they produce food.
  2. Organisms that feed on plants are called __________.
  3. __________ decompose dead organic matter.
  4. The flow of energy in an ecosystem is __________ (Unidirectional).
  5. Ozone molecule contains __________ atoms of oxygen.
  6. Biodegradable wastes can be broken down by __________.
  7. Non-biodegradable wastes like __________ persist in environment.
  8. CFC stands for __________.
  9. In a food chain, the third trophic level is occupied by __________.
  10. Full form of UNEP is __________.
Section B: Classify Waste

Q11-20. Identify as Biodegradable (B) or Non-Biodegradable (NB):

  1. Fruit Peels - __________ (B)
  2. Plastic Bottle - __________ (NB)
  3. Old Newspaper - __________ (B)
  4. Glass pieces - __________ (NB)
  5. Cotton cloth - __________ (B)
  6. DDT - __________ (NB)
  7. Leather belt - __________ (B)
  8. Metal Can - __________ (NB)
  9. Jute Bag - __________ (B)
  10. Polythene Bag - __________ (NB)
Section C: True or False

Q21-30. State True or False:

  1. Man is an Omnivore. __________ (True).
  2. Decomposers replenish nutrients in the soil. __________ (True).
  3. Ozone layer protects us from Infrared rays. __________ (False, UV).
  4. Energy increases at higher trophic levels. __________ (False, decreases).
  5. Aquarium is an artificial ecosystem. __________ (True).
  6. Food web behaves like a single straight chain. __________ (False).
  7. 10% energy is available to next level. __________ (True).
  8. Paper is non-biodegradable. __________ (False).
  9. Sun is the ultimate source of energy. __________ (True).
  10. CFCs are used in refrigerators. __________ (True).
Section D: One Word Answers

Q31-40. Answer in one word:

  1. Name the gas formed by action of UV rays on oxygen. __________ (Ozone).
  2. Which organisms constitute the first trophic level? __________ (Producers/Plants).
  3. Name a natural ecosystem. __________ (Forest/Pond).
  4. What percentage of solar energy is trapped by plants? __________ (1%).
  5. Name the phenomenon of accumulation of chemicals in food chain. __________ (Biomagnification).
  6. Who proposed the 10% law? __________ (Lindeman).
  7. Which radiation causes skin cancer? __________ (UV).
  8. Name a scavenger. __________ (Vulture/Crow).
  9. Are crop fields natural or artificial? __________ (Artificial).
  10. Can energy flow back from herbivore to producer? __________ (No).
Section E: Correct Order

Q41-50. Arrange in correct food chain order: (Producer > Primary > Secondary)

  1. Frog, Grass, Insect. __________ (Grass > Insect > Frog).
  2. Lion, Deer, Grass. __________ (Grass > Deer > Lion).
  3. Snake, Frog, Hawk, Grass, Insect. __________ (Grass > Insect > Frog > Snake > Hawk).
  4. Fish, Phytoplankton, Bird, Zooplankton. __________ (Phyto > Zoo > Fish > Bird).
  5. Goat, Man, Grass. __________ (Grass > Goat > Man).