Principles of Ecology. — BIO BOTANY STD 12 — Question

At which cellular stage, does the pollen grains are usually liberated from anther? What happens to the generative cell if the pollen reaches the stigma?

What is Albedo effect?

Golden rice is a bio-fortified rice developed by rDNA technology. It differes from its parental strain by possessing ‘psy’ gene, ‘crt-1’ gene and ‘lye’ gene which are responsible for beta – carotene synthesis.
(a) Name the sources of the above mentioned genes.
(b) Which disease can be controlled / prevented if a person’s diet has golden rice?

Name the four basic concepts of plant tissue culture.

The following are the binomials of economically useful plants. Mention their respective families.
(a) Borassus flabellifer
(b) Mangifera indica
(c) Saccharum officinarum
(d) Curcuma longa
(e) Capsicum annum
(f) Tamarindus indica

What is genetic mapping?

Mention any two Jute species.

Define ozone hole. Name any one potent chemical that is responsible for the effect.

Write the equivalent botanical terms for the following words / sentences.
(a) Landing platform of pollen
(b) Ovarian cavity
(c) Megasporangium
(d) Basal swollen part of pistil

State the role of cryoprotectants in conservation of plant resources.