Practice free Sexual Reproduction in Flowering Plants (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Scientists are trying to transfer apomictic genes into hybrid varieties of several of our food and vegetable crops so that:
Read page 39, XII NCERT
Which of the following is the most common abiotic pollinating agent?
Read page 29, XII NCERT
Amongst the abiotic agents, 98% is by wind.
The ovule of an angiosperm is technically equivalent to
The ovule of an angiosperm is technically equivalent to a megasporangium, which is the structure that produces megaspores through meiosis. The megaspore further develops into the female gametophyte, while the ovule develops into the seed after fertilization.
Which one of the following may require pollinators, but is genetically similar to autogamy?
Geitonogamy is functionally cross pollination but genetically it is autogamy because in geitonogamy the pollens come from the same plant.
Flowers, which have single ovule in the ovary and are packed into inflorescence are usually pollinated by
The flowers with packed inflorescence and single ovary are air pollinated. These flower have pollen grains produced in large numbers, which are light weighted, sometimes winged, e.g. cereals and grasses.
Functional megaspore in an angiosperm develops into
In angiosperms, functional megaspore develops into an embryo sac. The functional megaspore is the first cell of female gametophyte.
A dioecious flowering plant prevents both
Dioecious flowering plants contain unisexual flower. In dioecious condition two types of unisexual flowers occur on different plants.
Hence, it does not favour autogamy and geitonogamy because autogamy takes place in bisexual flowers and geitonogamy takes place between different flower of the same plant.
Attractants and rewards are required for
Attractant and rewards are required for entomophily (insect pollination). Flowers produce specific odour and nectar to attract the insect for effective pollination. Entomophilous flowers are large with bright colours.
In majority of angiosperms
Pollination in water hyacinth and water lily is brought about by the agency of
Water hyacinth has single spike of 8-15 conspicuous attractive flowers which attract bees and other insects. These insects pollinate them. This plant is an aquatic weed.
Water lily is also an aquatic plant with large conspicuous coloured flowers. Most of the species are bee pollinated except few species where wind pollination occurs.
Insect pollinated flowers have coloured petals, big size and they offer fragrance and nector to attract insects which bring about pollination in them.
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