Which one of the following is NOT a correct feature of Homo erectus ?

Which of the following hormone is generally not produced by the placenta?

Observe the figures and answer the question.

Coleoptile and Coleorrhiza in the embryo of grasses are:

Phytophagous insects feed on :

Hardy - Weinberg principle states that:

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.
In organic farming, there is -

Match List I with List II.

LIST I	LIST II
A. Agrobacterium tumifaciens	I. Join foreign DNA to plasmid
B. Thermus aquaticus	II. First recombinant DNA
C. Plasmid of Salmonella	III. Thermostable DNA polymerase
D. Ligase	IV. Ti Plasmid

Choose the correct answer from the options given below:

Match List - I With List - II

List - I	List - II
(A) The area of parallelogram determined by vectors \(2 \hat{i}\) and \(3 \hat{j}\)	(I) 2
(B) The value of \((\hat{i} \times \hat{j}) \cdot \hat{k}+(\hat{j} \times \hat{k}) \cdot \hat{i}\)	(II) 4
(C) The value of a for which the vectors \(2 \hat{i}-3 \hat{j}+4 \hat{k}\) and \(a \hat{i}-6 \hat{j}+8 \hat{k}\) are collinear.	(III) 0
D. The value of \(\lambda\) for which the vectors \(2 \hat{i}+\hat{j}+\hat{k}\) and \(2 \hat{i}-4 \hat{j}+\lambda \hat{k}\) are perpendicular.	(IV) 6

Choose the correct answer from the options given below.

The area of the region bounded by the curve y = x + 1, x-axis and the lines x = 2 and x = 3 is

Let \(A X=B\) be a system of three linear equations in three variables. Then the system has
(A) a unique solutions if \(|A|=0\)
(B) a unique solutions if \(|A| \neq 0\)
(C) no solutions if \(|A|=0\) and \((\operatorname{adj} A ) B \neq 0\)
(D) infinitely many solutions if \(|A|=0\) and \((\operatorname{adj} A ) B =0\)
Choose the correct answer from the options given below:

Transgenic tobacco plant was developed to prevent Meloidegyne incognitia infestation. This was based on the method of cellular defence involving synthesis of:

If order of matrix A is \(m \times p\) and order of matrix B is \(p \times n\), then what is the order of matrix AB ?

Amoebic dysentery is caused by: