Mention the pollinating agent of an inflorescence of small dull coloured flowers with well exposed stamens and large feathery stigma. Give any one characteristics of pollen grain produced by such flowers.

Spiny or sticky pollen grains and large,attractively coloured flowers are associated with

Transfer of pollen grains from the anther of flower of one plant to stigma of flower of another plant is called

A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modification faciliate pollination by:

ADDITIONAL QUESTIONS : The diagram represents a flower. Label the parts and answer the following : (a) Give the letter of the structure which : (i) becomes the fruit wall, (ii) becomes the testa (seed coat), (iii) produces pollen grains. (b) Explain two ways, shown in the diagram, in which this flower is adapted for insect pollination.

Give the scientific name of any one plant that exhibits incomplete dominance in the inheritance of its flower colour.

ADDITIONAL QUESTIONS : The diagram below shows a germinating pollen grain and a mature ovule from an insect-pollinated flower. Some parts have been labelled. Give the letter of the nucleus which fuses with a male nucleus to form each of the following : (i) The zygote (ii) The endosperm

ASSERTION TYPE QUESTIONS : These questions consist of two statements each, printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses. A. If both Assertion and Reason are true and Reason is correct explanation of Assertion B. If both Assertion and Reason are true but Reasou is not correct explanation of Assertion. C. If Assertion is true but Reason is false. D. If both Assertion and Reason are false. . Assertion : Stigma of pistil receives the pollen during pollination. Reason: Pollen grains are produced in ovary of gynoecium.

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds. Answer the following questions giving reasons: (a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil? (b) What would have been the minimum number of ovules present in the ovary? (c) How many megaspore mother cells were involved? (d) What is the minimum number of microspore mother cells involved in the above case? (e) How many male gametes were involved in this case?