Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

Mention a product of human welfare obtained with the help of the following microbes:
Propionibacterium sharmanii

Write the location and functions of Myometrium and Endometrium.

Angiosperms bearing unisexual flowers are said to be either monoecious or dioecious. Explain with the help of one example each.

A cross was carried out between two pea plants showing the contrasting traits of heightof the plant. The result of the cross showed 50% of parental characters.

1. Work out the cross with the help of a Punnett square.
2. Name the type of the cross carried out.

Honeybees produce their young ones only by sexual reproduction. Inspite of this, in a colony of bees we find both haploid and diploid individuals. Name the haploid and diploid individuals in the colony and analyse the reasons behind their formation.

Is Marchantia monoecious or dioecious? Why? Where are the sex organs borne in this plant?

Explain the relevance of "Totipotency" and "Somaclones" in raising healthy banana plants from virus infected banana plants.

Why is it difficult to get rid of water hyacinth' from a water body? Name one abiotic component and one biotic component of the ecosystem that gets affected by its spread in the water body.

"The energy flow in an ecosystem is unidirectional'. Justify the statement.