There are some lotus flowers in a pond. Some birds in flight thought of resting on them. When each bird sat on a flower, one bird had no seat. When a pair of birds sat on each flower, one flower had no bird. How many flowers? How many birds?

Many of the flowering plants have developed some devices for discouraging inbreeding. Write any two of them.

Read the following statements and find out the incorrect statements. a. Majority of flowering plants use a range of animals as pollinating agents. b. Bees, butterflies, flies, beetles, wasps, ants, moth, birds (sunbirds and humming birds) and bats are the common pollinating agents. c. Among the animals, insects particularly bees are the dominant biotic pollinating agents. d. Even larger animals such as some primates (lemurs), arboreal (tree dwelling) rodent, or even reptiles (gecko lizard and garden lizard) have also been reported as pollinators in some species. e. Often flowers of animal pollinated plants are specifically adapted for a particular species of animal.

Examin carefully the details given and group similar one in the table. Given suitable title for each column. Analyse the importance of each group in evolution. (Wings of bat, flipper of whale, wings of butterfly, forelimbs of horse, wings of birds, rudementary body hair, wisdom teeth, vermiform appendix of man, patagium of draco)

Read the following statements carefully and select the appropriate option given below. (i) Reproduction is defined as a biological process in which an organism gives rise to the young ones (offspring) similar to itself. (ii) Adventitious buds arise from the notches present at margins of leaves of Bryophyllum. (iii) Asexual reproduction is common among single celled organisms, and in plants and animals with relatively simple organisations. (iv) A few plants exhibit unusual flowering phenomenon, some of them such as bamboo species flower only once in their life time, generally after 50-100 years. (v) The events of asexual reproduction though elaborate and complex, follow a regular sequence.