STD 12 - 1. sexual reproduction in flowering plants — BIOLOGY STD 12 Science — Question

Intra-species incompatibility can be overcome by

A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the above situation is:

Species restricted to a given area are called:

Which of the fossil man possessed a cranial capacity almost equal to that of modern man

One pollen mother cell may produce four germinating pollen grains, each with two male nuclei and one tube nucleus. How many meiotic divisions are necessary to bring this about

Find out correct pair.

In some viruses, RNA is present instead of DNA indicating that:

Energy flow in ecosystem is:

There are two alleles A₁​ and A_2​, out of which, one A1​ has nil abundance in a population, then the abundance of second allele A₂​ is: