QUESTION | ANSWER | EXPLANATION |
In atom bomb explosion, _______ energy is primarily converted into _______ energy. atomic, sound
chemical, atomic
chemical, light
atomic, heat
| atomic, heat | |
The property of plants to manufacture their food is known as _______. Phototropism
Phototaxis
Autotrophism Photokinesis
| Autotrophism | |
_______ convert chemical energy to electrical energy. Bulbs
Battery cells Microwave ovens
Air conditioners
| Battery cells | |
Which is not a scavenger ? Vulture
Hyaena
Camel Crow
| Camel | Scavenger is an organism which feeds on dead and putrefying flesh. |
When coal is burnt, _______ energy is converted into light and heat. Electric
Chemical Atomic
| Chemical | |
What is the name given to the green pigment in plants ? Stomata
Tendrils
Chlorophyll Starch
| Chlorophyll | |
From the bark of which tree is quinine obtained? Cinchona Redwood
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
Earthworm Beetle
Ringworm
| Earthworm | |
When water is boiled, it is converted into steam. This is an example of conversion of _______ energy to mechanical energy. Chemical
Light
Heat 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 ? Carbon dioxide
Nitrogen
ATP
Oxygen
| 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
Rubber
Paper
| Paper | |
Which is not a 'renewable' resource of energy ? Petroleum Sun
Water
Wind
| Petroleum | |
Plants manufacture their food by the process of Symbiosis
Photokinesis
Chemosynthesis
Photosynthesis
| 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 Photokinesis
Photosynthesis 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 Phototropism Chemotropism
Thigmotropism
Hydrotropism
| Phototropism | |
Autotrophic component of the ecosystem Consumers
Decomposers
All of these
Producers
| 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 Lactobacillus
Clostridium
Rhizobium 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 live on or inside the other organism.
They derive their food from the organism on which they live.
They are always beneficial to the other organism. 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 ? Plants
Insects
Bacteria
Water
| 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
Petrol
Soil
Wind
| 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. True False
| 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'. |