STD 12 - 13. biodiversity and conservation — BIOLOGY STD 12 Science — Question

Autogamy can occur in a chasmogamous flower if:

The Earth Summit (1992) was held at:

The following graph of relative concentrations of the four hormones present in the blood plasma of a woman during her menstrual cycle. Identify the hormones.

Food chain in which micro-organisms break- down the food formed by primary producers are:

Receptors for sperm binding in mammals are present on :

What is the error in above diagram?

Identify the examples of convergent evolution from the following:

Stratum germinativum is an example of which kind of epithelium?

A clove represents a:

How many sentences are correct?

- To produce seeds without fertilisation is called apomixis

- Occurance of more than one embryo in a seed is referred to as polyembryony

- The pollen grains represent the male gametophytes.