Botany MCQs for NEET — Practice Questions with Answers

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.

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.

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.

Tapetum is the inner layer of microsporangium (anther) which provides nourishment to developing pollen grain after meiotic cell division.

Coconut milk represents free-nuclear endosperm where the division of primary endosperm nucleus is not followed by formation of cell walls (cytokinesis) thus all nucleus remain free in liquid form. It is rich in plant hormone cytokinin.

Apomixis is a special mechanism found in flowering plants to produce seeds without fertilisation. It is a type of asexual reproduction which mimics the sexual reproduction and is commonly found in citrus varieties.

Nectar and pollen grains are important floral rewards to the animal pollinators such as moths, butterflies, wasps, bees, birds, etc.

Geitonogamy is a type of self pollination. In other word geitonogamy is transfer of pollen grain from the anther of one flower to the stigma of another flower of the either same or genetically similar plant.

Pollen grain are rich in nutrients. In recent years pollen tablets are used as food supplements as they are vich in isoprotein. It is used for bleeding problems, coughing, vomiting, bloody diarrhoea and brain haemorrhage. Pollen tablets are also used by athelets for instant energy.