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why are pollen grains produced in large quantity in wind -pollinated flowers?

Placenta present in mammals acts as an endocrine tissue and produces

Genotypically the pollen grains produced inside the anther belong to 1. one type 2. two types 3. many types 4. all the above

Read the following and select the incorrect statements: A. The placenta acts as a permanent endocrine tissue and produces several hormones. B. During pregnancy levels of cortisol, prolactin, thyroxine, and estrogen hormones also Increase several folds in maternal blood. C. The second meiotic division of secondary spermatocyte in females is unequal and results in the formation of a polar body. D. The secondary follicle transforms into a tertiary follicle which is characterized by a fluid - filled cavity called the antrum.

Read the following and select the incorrect statements: A. The placenta acts as a permanent endocrine tissue and produces several hormones. B. During pregnancy levels of cortisol, prolactin, thyroxine, and estrogen hormones also Increase several folds in maternal blood. C. The second meiotic division of secondary oocyte in females is unequal and results in the formation of a polar body. D. The secondary follicle transforms into a tertiary follicle which is characterized by a fluid - filled cavity called the antrum.

Study of pollen grain is called 1. Entomology 2. Palynology 3. Paleobotany 4. Co-taxonomy

Which one among the following animal tissues transports hormones and heat and maintains water balance ? 1. Connective tissue 2. Muscular tissue 3. Blood 4. Nervous tissue

Which of the following statements is not correct 1. Insects that consume pollen or nectar without bringing about pollination are called pollen/nectar robbers 2. Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil 3. Some reptiles have also been reported as pollinators in some plant species 4. Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style