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

What is the function of trophoblast in human embryo?

Name two diseases whose spread can be controlled by the eradication of Aedes mosquitoes.

Write the expanded form of IUCN.

Mention the pollinating agent of an inflorescence of small dull coloured flowers with well exposed stamens and large feathery stigma. Give any one characteristic of pollen grains produced by such flowers.

Which one of the following diseases could be avoided in the progeny by analyzing the pedigree of the parents: Down's syndrome, Phenylketonuria, Poliomyelitis.

Mark the odd one in give each of the following groups.
Human hands, Wings of butterfly, Wings of bat, Wings of birds.

Name the process, the microbes carry out during sewage treatment.

What do you call the kind of mutation in which a single base is added to a base strand?

Fill in the blanks.

In aquatic ecosystems, the limiting factor for the productivity is _________.

Bt toxin protein exists in which form inside bacterium?