Explain adaptive radiation with the help of a suitable example.
The process of evolution that starts from a single point and radiates in different directions is called adaptive radiation. For example the evolution of marsupials of Australia, each different from one another evolved from a common ancestral stock is found within the Australian island.
How are productivity, gross productivity, net primary productivity and secondary productivity interrelated?
Double fertilization is reported in plants of both, castor and groundnut. However, the mature seeds of groundnut are non-albuminous and castor are albuminous. Explain the Post fertilization events that are responsible for it.
A teacher wants his/her students to find the genotype of pea plants bearing purple coloured flowers in their school garden. Name and explain the cross that will make it possible.
A DNA segment has a total of 1000 nucleotides, out of which 240 of them are adenine containing nucleotides. How many pyrimidine bases this DNA segment possesses?
A team of students are preparing to participate in the interschool sports meet. During a practice session you find some vials with labels of certain cannabinoids.
(a) Will you report to the authorities? Why?
(b) Name of a plant from which such chemicals are obtained.
(c) Write the effect of these chemicals on human body.
Enlist the steps involved in inbreeding of cattle. Suggest two disadvantages of this practice.
Choose any three microbes, from the following which are suited for organic farming which is in great demand these days for various reasons. Mention one application of each one chosen.
Mycorrhiza; Monascus; Anabaena; Rhizobium; Methanobacterium; Trichoderma.
