QUESTION | ANSWER | EXPLANATION |
In atom bomb explosion, _______ energy is primarily converted into _______ energy. atomic, sound
chemical, atomic
atomic, heat chemical, light
| atomic, heat | |
The property of plants to manufacture their food is known as _______. Phototropism
Phototaxis
Photokinesis
Autotrophism
| 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. Chemical Electric
Atomic
| 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 Malaria Curing Aids
Curing Typhoid
Removing pimples
| Curing Malaria | |
Which organism is helpful in making the soil fertile ? Earthworm Roundworm
Beetle
Ringworm
| 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 _______. Negative phototaxis Positive 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
Paper Jute
Rubber
| Paper | |
Which is not a 'renewable' resource of energy ? Petroleum Sun
Water
Wind
| Petroleum | |
Plants manufacture their food by the process of Symbiosis
Photosynthesis Photokinesis
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 Photokinesis
Photoperiodism
Symbiosis
Photosynthesis
| 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
Hydrotropism
Phototropism
| 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
Rhizobium 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 Saprophytism
Predation
Etiolation
Symbiosis
| 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 ? 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. False
True
| True | Belladona is a herb used in praparing many drugs. |
Saprophytes derive their food from dead organisms. False
True
| 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. False
True
| 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'. |