| QUESTION | ANSWER | EXPLANATION |
In atom bomb explosion, _______ energy is primarily converted into _______ energy.
• atomic, sound
• atomic, heat
• chemical, atomic
• chemical, light
| atomic, heat | |
The property of plants to manufacture their food is known as _______.
• Phototropism
• Autotrophism
• Phototaxis
• Photokinesis
| Autotrophism | |
_______ convert chemical energy to electrical energy.
• Bulbs
• Microwave ovens
• Air conditioners
• Battery cells
| Battery cells | |
Which is not a scavenger ?
• Vulture
• Hyaena
• Crow
• Camel
| Camel | Scavenger is an organism which feeds on dead and putrefying flesh. |
When coal is burnt, _______ energy is converted into light and heat.
• Electric
• Atomic
• Chemical
| Chemical | |
What is the name given to the green pigment in plants ?
• Stomata
• Chlorophyll
• Tendrils
• Starch
| Chlorophyll | |
From the bark of which tree is quinine obtained?
• Redwood
• Cinchona
• Eucalyptus
• Bunyan
| Cinchona | |
What is quinine used for ?
• Curing Aids
• Curing Malaria
• Curing Typhoid
• Removing pimples
| Curing Malaria | |
Which organism is helpful in making the soil fertile ?
• Roundworm
• Beetle
• Ringworm
• Earthworm
| Earthworm | |
When water is boiled, it is converted into steam. This is an example of conversion of _______ energy to mechanical energy.
• Chemical
• Heat
• Light
• Atomic
| Heat | |
Which is not a herbivorous animal ?
• Cow
• Monkey
• Deer
• Lion
| Lion | Herbivores are plant-eating animals. Lion is a carnivorous (flesh-eating) animal. |
Movement of organisms away from the sunlight is known as _______.
• Positive phototaxis
• Negative phototaxis
• Photoperiodism
• Autotrophism
| Negative phototaxis | Movement of organisms in response to sunlight is known as phototaxis. Earthworms exhibit negative phototaxis, while green flagellates exhibit positive phototaxis. |
Which is a by-product of photosynthesis ?
• Oxygen
• Carbon dioxide
• Nitrogen
• ATP
| Oxygen | In the presence of sunlight, plants utilize CO2 to prepare their food. This can be expressed as: carbon dioxide + water ------> glucose + water + oxygen |
_______ is made from bamboo plants.
• Silk
• Jute
• Paper
• Rubber
| Paper | |
Which is not a 'renewable' resource of energy ?
• Petroleum
• Sun
• Water
• Wind
| Petroleum | |
Plants manufacture their food by the process of
• Symbiosis
• Photokinesis
• Photosynthesis
• Chemosynthesis
| Photosynthesis | In the presence of sunlight, plants utilize CO2 to prepare their food. This can be expressed as: carbon dioxide + water ------> glucose + water + oxygen |
Light energy is converted into chemical energy by the process of
• Photosynthesis
• Photokinesis
• Photoperiodism
• Symbiosis
| Photosynthesis | In the presence of sunlight (light energy), plants utilize CO2 to prepare their food (chemical energy). This can be expressed as: carbon dioxide + water ------> glucose + water + oxygen |
The response of plants to light is known as
• Chemotropism
• Thigmotropism
• Phototropism
• Hydrotropism
| Phototropism | |
Autotrophic component of the ecosystem
• Consumers
• Decomposers
• Producers
• All of these
| Producers | Ecosystem has two components : biotic or living and abiotic or non-living. Biotic components include producers (autotrophic components i.e., plants), consumers and decomposers. Abiotic components include organic and inorganic substances and environmental factors. |
Nitrogen-fixing bacterium
• Rhizobium
• Lactobacillus
• Clostridium
• Salmonella
| Rhizobium | Rhizobium is found in root nodules of pea. It gets its nourishment from these plants. In turn, it provides nitrates to the plants which are used in protein synthesis. This is a good example of symbiosis. |
Interaction between organisms of different species so as to get benefit from each other is known as
• Symbiosis
• Saprophytism
• Predation
• Etiolation
| Symbiosis | Rhizobium is found in root nodules of pea. It gets its nourishment from these plants. In turn, it provides nitrates to the plants which are used in protein synthesis. This is a good example of symbiosis. |
Which is not true regarding parasites ?
• They are always beneficial to the other organism.
• They live on or inside the other organism.
• They derive their food from the organism on which they live.
• Leech is a parasite.
| They are always beneficial to the other organism. | Parasites derive their nutrition from the organism on which they live and thus deprive the organism of those nutrients. |
Which is not a 'biotic part' of the ecosystem ?
• Water
• Plants
• Insects
• Bacteria
| Water | Ecosystem has two components : biotic or living and abiotic or non-living. Biotic components include producers, consumers and decomposers. Abiotic components include organic and inorganic substances and environmental factors. |
Which is not a 'nonrenewable' source of energy ?
• Coal
• Wind
• Petrol
• Soil
| Wind | |
Which fungus is used in making bread?
• Aspergillus
• Yeast
• Penicillium
• Pleurotus
| Yeast | Yeast is a leavening agent used in baking. It causes fermentation of carbohydrates and produces gas which lightens the dough. |
Belladona has medicinal properties.
• True
• False
| True | Belladona is a herb used in praparing many drugs. |
Saprophytes derive their food from dead organisms.
• True
• False
| True | |
Silk fibre is produced by certain insects.
• True
• False
| True | Silk fibres are produced by silkworms to form a protective covering (cocoon) around themselves. |
Water is used to produce electricity.
• False
• True
| True | Electricity produced with the help of water is known as hydroelectricity. Water falling from a height causes rotation of turbines which in turn causes movement of generators to produce electricity. |
Food energy is transferred from one organism to the other through food webs.
• False
• True
| True | The interlinking of several food chains constitutes food webs. |
Mammals are homeothermic animals.
• True
• False
| True | Homeothermic organisms like mammals and birds are capable of maintaining a constant body temperature despite changes in atmospheric temperature. |
Man is an amphibian.
• True
• False
| False | Amphibians are organisms which are capable of living inside as well as outside the water, e.g., frog, toad, alligator, crocodile, newt and salamander. |
Very high concentration of carbon dioxide accelerates plant growth.
• True
• False
| False | Very high concentration of carbon dioxide retards plant growth. |
'Lac' is a plant product.
• True
• False
| False | Lac is a semisolid substance secreted by 'lac insects'. |
