Orchid flower, Ophrys co-evolves to maintain resemblance of its petal to female bee. Explain how and why does is do so ?
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1. **Understanding Co-evolution**: Co-evolution refers to the process where two or more species influence each other's evolutionary trajectory. In this case, the orchid flower (Ophrys) and male bees are co-evolving.
2. **Mimicry in Orchids**: The orchid flower has evolved to have petals that closely resemble the appearance of a female bee. This resemblance is a form of mimicry known as sexual mimicry.
3. **Purpose of Mimicry**: The primary purpose of this mimicry is to attract male bees for pollination. The male bees are deceived into thinking that the flower is a female bee, which leads them to approach the flower.
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Which part of the Ophrys flower bears an uncanny resemblance to the female of the bee in size, colour and markings?
Assertion: In Ophrys one petal of the flower bears an uncanny resemblance to the female bee. Reason: Two closely related species competing for the same resource can coexist simultaneously.
(a) A capsicum flower has 240 ovules in its ovary . But , it produces a fruit with only 180 viable seeds. Explain giving a reason that could be responsible for such a result. (b) Describe the development of an endosperm in a viable seed. Why does endosperm development precedes embryo development ? (c) Give an example of an angiosperm seed that has a perisperm . Name the part the perisperm develops from.
The following is a food chain that ends with human : plants to bee to human (a) Explain how plants provide food for bees. (b) How do bees provide food for humans ? (c) How does this food chain differ from a usual food chain involving human such as : plants to goat to human ? (d) Do you think that the food chain given in this question can really be regarded as a food chain ? Explain your answer.
Arvind sometimes go for late evening walk with his father who has a background of biology. While walking in the colony park, he observed many plants having colour flowers. He also saw few plants having white flowers. Most of these flowers emit pleasant fragrance (=aroma). out of curiousty, Arvind asked his futher the following questions: (i) Why do plants have variously coloured folowers ? GIve two reasons. (ii) Why do certain flowers emit fragrance ? How does fragrance of flowers sperad in the environment ? (iii) Which scientific phenomenon is involved when (a) fragrance spreads in the house at the time of coking of food in the kitchen, (b) exchange of gases occurs acorss the respiratory surface.
In the Suniti building in Mumbai there are 12 floors plus the ground floor. 9 people get into the lift of the building on the ground floor. The lift does not stop on the first floor. If 2, 3 and 4 people alight from the lift on its upward journey, then in how many ways can they do so? (Assume they alight on different floors.)
CBSE COMPLEMENTARY MATERIAL-ORGANISMS AND POPULATION -LA
