What is the functional unit of the environment comprising of the living and non-living components called?
State whether the following statements are true or false :
(a) In biology, human beings are called producers.
(b) Secondary consumers and tertiary consumers, both are carnivores.
Name the organisms belonging to the second and the fourth trophic levels in the food chain comprising the following:
Frogs, Plants, Snakes, Hawk, Insects
Which organisms belong to third and fourth trophic levels in the food chain comprising the following?
Rats, Plants, Hawk, Snakes
Which one term in the following includes the others?
Air, flora, fauna, environment, water, sunlight, soil
Fill in the following blanks with suitable words :
(a) Decomposer organisms are _________in their action.
(b) In nature, all green plants are_ whereas animals are consumers.
(c) A series of organisms, each of which feeds on the next organism, the beginning of which is a green plant, is called a _________
(d) The science that deals with the inter-relationships of living things with one another and their environment is called_
(e) Plastic is a _________material whereas paper is a _________material.
Give an example of a four-step food chain operating in grassland. Name the secondary consumer in this food chain.
Consider the food chain :
Grass → Deer → Lion
What will happen if all the lions are removed from the above food chain?
The number of malaria patients in a village increased tremendously when a large number of frogs were exported from the village. What could be the cause of it?
Which of the following are biodegradable and which non-biodegradable?
Glass bottle, Paper, Ballpoint pen refill, Hay, DDT, Wheat, Cake, Wood, Polythene bag, Jute bag, Cotton cloth, Grass, Vegetable peels
At which trophic level a person is feeding when he is eating:
(a) roasted chicken
(a) State one advantage of using jute bags over plastic bags for shopping.
(b) Write a common food chain of a pond ecosystem having four links.
(a) What is meant by biodegradable waste materials? Give two examples of biodegradable wastes.
(b) Which of the following materials is non-biodegradable?
Aluminum wire, Tea leaves, Synthetic fiber, Wool
(a) What is meant by the 'environment'?
(b) What type of substances are the major pollutants of the environment? Name two such substances.
(c) Name the organisms whose uncontrolled activities are damaging the environment.
(d) Explain why it is better to use paper bags than plastic bags.
Which of the following constitutes a food chain?
(a) Grass, Wheat, and Mango
(b) Grass, Goat, and Human
(c) Goat, Cow, and Elephant
(d) Grass, Fish, and Goat
Which of the following represents a possible food chain found in a pond :
|Primary producers||Primary consumers||Secondary consumers|
|(a)||green algae||Fish||mosquito larvae|
|(b)||fish||green algae||mosquito larvae|
|(c)||mosquito larvae||Fish||green algae|
|(d)||green algae||mosquito larvae||fish|
Which of the following are decomposers of dead organisms?
In a food chain, the third trophic level is always occupied by:
Accumulation of non-biodegradable pesticides in the food the chain in an increasing amount at
each higher trophic level is known as:
If a grasshopper is eaten by a frog, then the energy transfer will be from:
(a) producer to decomposer
(b) producer to primary consumer
(c) primary consumer to secondary consumer
(d) secondary consumer to tertiary consumer
The decomposers in an ecosystem :
(a) convert inorganic material to simpler forms
(b) convert organic material to inorganic forms
(c) convert inorganic material into organic compounds
(d) do not break down organic compounds
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
(a) The population of tigers increases
(b) the population of grass decreases
(c) Tigers will start eating grass
(d) The population of tigers decreases and the population of grass increases.
Organisms which synthesize carbohydrates from inorganic compounds by using radiant energy are called :
In the following groups of materials, which group/groups contain only non-biodegradable materials?
(i) wood, paper, leather
(ii) polythene, detergent, PVC
(iii) plastic, detergent, grass
(iv) plastic, bakelite, DDT
(c) (i) and (iii)
(d) (ii) and (iv)
Which of the following statement is incorrect?
(a) all green plants and blue-green algae are producers
(b) green plants get their food from readymade organic compounds
(c) producers prepare their own food from inorganic compounds
(d) plants convert solar energy into chemical energy
Which of the following is not a non-biodegradable material?
(a) nylon socks
(b) plastic school bag
(c) jute carry bag
(d) polyester clothes
The use of one of the following will pollute the environment. This one is :
(a) paper carry bags
(b) cotton cloth carry bags
(c) nylon cloth carry bags
(d) jute carry bags
One of the following is not a consumer. This one is:
One of the following helps in the recycling of materials in an ecosystem. This one is:
In the food chain comprising of a snake, grass, insect, and frog, the secondary consumer is :
The Sahara Desert was formed over a period of time due to one of
the following uncontrolled activities of man :
(a) excessive cutting down of forest plants and trees
(b) excessive killing of large herbivores
(c) excessive killing of large carnivores
(d) excessive use of poisonous chemicals herbicides
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