Maximum number of male gametes produced from one pollen mother cell (microspore mother cell) will be:

Match List-I with List-II

List-I  (Geological periods)	List-II (Plant forms)
(A) Cretaceous	(I) Seed ferns
(B) Jurassic	(II) Progymnosperms
(C) Carboniferous	(III) Sphenopsids
(D) Devonian	(IV) Conifers

Choose the correct answer from the options given below:

Arrange the correct sequence of steps for gel electrophoresis.
(A). Load this DNA into the agarose gel matrix
(B). Cutting the DNA fragments by using a restriction enzyme
(C). Use ethidium bromide for DNA staining
(D). Separated bands of DNA are cut out from agarose gel
Choose the correct answer from the options given below.

Which of the following is a free living, effective biocontrol agent, found very often in the root ecosystem?

In grass families, the cotyledon is called as:

Match List I with List II.

LIST I (Name of the organism)	LIST II (Chromosome number in a meiocyte)
A. Rat	I. \(38\)
B. Dog	II. \(42\)
C. Cat	III. \(1260\)
D. Ophioglossum	IV. \(78\)

Choose the correct answer from the options given below:

Identify the salient features of the genetic code.
A. 60 codons code for amino acids and 4 codons do not code for any amino acids.
B. It is unambiguous and specific
C. The code is degenerate
D. UUU is not a universal code.
Choose the correct answer from the options given below:

Consider two different hydrogen atoms. The electron in each atom is in first excited state. According to Bohr's model, electrons will have :

When resources are unlimited in a habitat, what type of growth is seen in the population?

If \(x = \sqrt{a^{\sin^{-1}t}}, y = \sqrt{a^{\cos^{-1}t}}\), then \(\frac{dy}{dx}\) is:

Embryological support for evolution was proposed by :

The rate constants of a reaction at 200 K and 300 K are \(0.02 s^{-1}\) and \(0.04 s^{-1}\). The activation energy ( \(E _{ a }\) ) for this reaction will be :

Read the following passage carefully and answer the given questions.
Biofertilisers
Biofertilisers are organisms that enrich the nutrient quality of the soil and their main sources are bacteria, fungi and cyanobacteria. You have studied about the nodules on the roots of leguminous plants formed by the symbiotic association of Rhizobium. These bacteria can fix atmospheric nitrogen into organic forms. Other bacteria can also fix atmospheric nitrogen while free-living in the soil (examples Azospirillum and Azotobacter). Fungi are also known to form symbiotic associations with plants (mycorrhiza). Many members of the genus Glomus form mycorrhiza. Plants having such associations show other benefits also, such as resistance to root-borne pathogens, tolerance to salinity and drought, and an overall increase in plant growth and development. Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environments many of which can fix atmospheric nitrogen, e.g. Anabaena, Nostoc, Oscillatoria, etc. In paddy fields, cyanobacteria serve as an important biofertiliser. Blue green algae also add organic matter in to the soil and increase its fertility. Currently, in our country, a number of biofertilisers are available commercially in the market and farmers use these regularly in their fields to replenish soil nutrients and to reduce dependence on chemical fertilisers.
Resistance to root-borne pathogens, salinity and drought tolerance are introduced into which type of plants?