Which one of the followings represent a correct form of mature angiosperm embryo sac?

Which of the following is used as a biological control agent for insects and other arthropods ?

Which of the following is a free living soil nitrogen fixing bacteria ?

Which one of the following genetic law is responsible for 3:1 expression of the phenotypic ratio in F2 generation?

Read the passage carefully and answer the given questions.
DNA Fingerprinting
Polymorphism in DNA sequence is the basis of genetic mapping of the human genome as well as of DNA fingerprinting. DNA fingerprinting involves identification of differences in some specific regions in the DNA sequence called repetitive DNA. It works on the principle of polymorphisms in DNA sequences. The repetitive DNA are separated from bulk genomic DNA. The bulk DNA forms a major peak and the other small peaks are referred to as satellite DNA. These repetitive/satellite DNA sequences show a high degree of polymorphisms and form the basis of DNA fingerprinting.
Variable Number of Tandem Repeats are -

Which of the following does not affects genetic equilibrium/Hardy Weinberg Equilibrium

Match List I with List II.

LIST I	LIST II
(A) Human skin colour	(I) Incomplete dominance
(B) ABO blood groups	(II) Polygenic inheritance
(C) Snapdragon	(III) Parthenogenesis
(D) Male honeybee	(IV) Multiple allelism

Choose the correct answer from the options given below:

Nitriles on reduction with lithium aluminum hydride produce

Two events A and B will be independent, then

Which of the following are examples of irregular trends in a time series?
(A) Decrease in production due to a sudden strike.
(B) The rise in prices before festivals.
(C) Unusual rise in income of the printing press due to the announcement of an election.
(D) Fall in crop yield due to floods.
Choose the correct answer from the options given below :

Synthesis of DNA can be outlined in the following steps:
(A)Joining of phosphoric acid unit to C-5 of nucleoside.
(B) Complementary base pairing between the strands.
(C) Joining of C-1 of pentose sugar to nitrogen of the base.
(D) Formation of phosphodiester linkage between C5 of one nucleotide and C3 of another.
Choose the correct answer from the options given below :

Identify the microbes producing commercially important organic acids and enzymes from the given options:
(A) Trichoderma polysporum
(B) Streptococcus
(C) Clostridium butylicum
(D) Aspergillus niger
Choose the correct answer from the options given below:

We use microbes and microbially derived products almost every day. Bacteria called lactic acid bacteria (LAB) grow in milk to convert it into curd. The dough, which is used to make bread, is fermented by yeast called Saccharomyces cerevisiae. Microbes are used to produce industrial products like lactic acid, acetic acid and alcohol, which are used in a variety of processes in the industry. However, certain bacteria, which grow anaerobically on cellulosic material, produce large amount of methane along with CO2 and H2. These bacteria are collectively called methanogens, and one such common bacterium is Methanobacterium. These bacteria are commonly found in the anaerobic sludge during sewage treatment. Microbes are also used for commercial and industrial production of certain chemicals like organic acids, alcohols and enzymes.
Examples of acid producers are Aspergillus niger (a fungus) of citric acid. You are familiar with the commonly used antibiotic Penicillin. Do you know that Penicillin was the first antibiotic to be discovered, and it was a chance discovery? Statins produced by the yeast Monascus purpureus have been commercialised as blood-cholesterol lowering agents. It acts by competitively inhibiting the enzyme responsible for synthesis of cholesterol.
Citric acid is commercially obtained by Aspergillus niger, which is a: