1a : a thing contrived especially : a mechanical device modern contrivances to cook food faster. b : an artificial arrangement or development Mistaken identity is used as a plot contrivance in the story. 2 : the act or faculty of contriving : the state of being contrived.
Simply so What is contrivance in biology? Contrivances. a feature that was developed for something different than it is used for today. Examples of contrivances. panda’s thumb, human larynx, flippers of seals and lions.
Is Contrivation a word? something contrived; a device, especially a mechanical one. the act or manner of contriving; the faculty or power of contriving. a plan or scheme; expedient.
also What are the contrivances of self pollination? The major contrivances of self-pollination are:
- Bisexuality.
- Homogamy.
- Cleistogamy.
What are the contrivances for cross pollination?
Contrivances for Cross-Pollination:
- Dicliny: Cross-pollination is the rule among diclinous plants, i.e., those bearing unisexual flowers. …
- Self-sterility: …
- Dichogamy: …
- Herkogamy (herkos = barrier): …
- Heteromorphism:
What is Exaptation in biology? Exaptation is a term used in evolutionary biology to describe a trait that has been co-opted for a use other than the one for which natural selection has built it. … They proposed exaptation as a counterpart to the concept of adaptation. For example, the earliest feathers belonged to dinosaurs not capable of flight.
Which of the following is the contrivance for self-pollination?
The major contrivances of self-pollination are: Bisexuality. Homogamy. Cleistogamy.
What is mechanical contrivance? “Mechanical contrivance” means any whirligig, swing, merry-go-round, aerial flight, water chute, switchback, or other like contrivances used for carrying persons for amusement, and shall include a grand stand.
What is the synonyms of sovereign?
OTHER WORDS FOR sovereign
1 emperor, empress, potentate. 3 government. 5 regal, majestic, imperial, princely, monarchical, kingly, queenly. 7 chief, paramount, principal, predominant.
What is that contraption? A contraption is a device that has a specific purpose and is often overly complicated. If your dad yells, “Get that contraption out of here!” He doesn’t appreciate the Rube Goldberg machine you made out of his golf clubs.
What is Dicliny or Unisexuality?
Dicliny is the presence of only one kind of reproductive whorl in a flower. Dicliny is thus called unisexuality. In dicliny, a plant may be monoecious i.e. both male and female flowers are borne on the same plant or the plant may be dioecious i.e. male and female flowers are borne on different plants.
Which of the following is not a contrivance of cross pollination? Cleistogamy is not a device to promote cross-pollination as the flowers remain closed and they promote self-pollination. For example, Balsam, Oxalis and Viola anthers dehisce inside closed flowers. Herkogamy, dichogamy and heterostyly are the devices which promote cross-pollination.
What are united petals called?
Answer: Corolla. Explanation: a condition in which all the petals are united.
Which of these is not a contrivance for cross pollination?
Explanation: Cleistogamy is not a device to promote cross-pollination as the flowers remain closed and they promote self-pollination. For example, Balsam, Oxalis and Viola anthers dehisce inside closed flowers. Herkogamy, dichogamy and heterostyly are the devices which promote cross-pollination.
Which is the common contrivance between self pollination and cross pollination? The main contrivances ensuring cross pollination are as follows: (i) Diclincy or Unisexuality: In unisexual flowers stamens and carpels are found in different flowers. Unisexuality can be of two types: Monoecious plant : When male and female flowers are borne on the same plant. e.g., Maize, Cucurbits, Castor.
What is an example of a preadaptation? The term preadaptation is applied when a large change in function is accomplished with little change in structure. Image: it has been suggested that bird feathers are an example of a preadaptation: the first feathers were for heat insulation rather than an adaptation for flight. …
What are examples of Exaptations?
Exaptation is the process of adaptation of a trait for a purpose other than what the trait was evolved for. For instance, an exaptation could be the use of feathers for mating displays or flight in birds which evolved feathers originally to keep warm. An exaptation is also known as pre-adaptation.
What does preadaptation mean? That is, preadaptation refers to the possibility of a characteristic to adopt a new biological function without evolutionary modification. The idea that the function of a trait might shift during its evolutionary history was initially developed by Darwin (1859).
What is pollination contrivance?
Flowers by nature are mostly cross pollinated. There are various adaptations for this process. In unisexual and bisexual flowers, certain devices are present for the effective self pollination and avoiding cross pollination, which are called as contrivances of self pollination.
Which of the following is a contrivance of cross pollination? Dicliny or unisexuality:
Monoecious plants bear both male and female flowers for example, maize, pumpkin, cucumber, castor etc. In dioecious condition, male and female flowers are borne by two different plants, i.e., the staminate flowers are born by male plants and the pistillate flowers by the female plants.
What does contraption mean in science?
: a piece of equipment or machinery that is unusual or strange. See the full definition for contraption in the English Language Learners Dictionary. contraption. noun.
Do synonyms and antonyms?
- accomplish,
- achieve,
- bring off,
- carry off,
- carry out,
- commit,
- compass,
- execute,