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In the dioecious aquatic plant shown, identify the characteristics of the male flowers that reach the female flowers for pollination:
| Size of the flower | Colour of flower | The characteristic feature of pollen grain | |
| A | small | brightly coloured | Lightweight and non-sticky |
| B | large | colourless | large and sticky |
| C | small | white | small, covered with mucilage |
| D | large | colourless | non-sticky |
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A botanist studying Viola (common pansy) noticed that one of the two flower types withered and developed no further due to some unfavorable condition, but the other flower type on the same plant survived and it resulted in an assured seed set. Which of the following will be correct?
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Autogamy can occur in a chasmogamous flower if ______.
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Choose the correct statement from the following:
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From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
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What is self-incompatibility?
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What background information did Watson and Crick had available with them for developing a model of DNA? What was their own contribution?
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The most accepted line of descent in human evolution is ______.
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Which of the following is an example for link species?
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Who among the Dryopithecus and Ramapithecus was more man-like?
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By what Latin name the first hominid was known?
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Among Ramapithecus, Australopithecines and Homo habilis - who probably did not eat meat?
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How do you express the meaning of words like race, breed, cultivars or variety?
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We are told that evolution is a continuing phenomenon for all living things. Are humans also evolving? Justify your answer.
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Name any one green house gas and its possible source of production on a large scale. What are the harmful effects of it?
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What are multipurpose trees? Give the botanical and local names of any two multipurpose trees known to you and list their uses.
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At which stage during evolution did human use hides to protect their bodies and buried their dead?
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When and why does a plant breeder employ the emasculation technique?
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Explain the relationship between CFC’s and Ozone in the stratosphere.
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Why ozone hole forms over Antarctica? How will enhanced ultraviolet Radiations affect us?
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