Why are the number of trophic levels in a food chain limited?

Mucosa-associated lymphoid tissue (MALT) is located within the lining of -

Select the incorrect statement/s from the following -
(A) In human male, the testes are situated outside the abdominal cavity within a pouch.
(B) Primary spermatocytes undergo mitosis to form secondary spermatocytes.
(C) Sertoli cells provide nutrition to the germ cells.
(D) Seminal plasma is rich in glucose, calcium and certain enzymes.
Choose the correct answer from the options given below :

Match List I with List II

List I	List ll
(A) Pneumonia	(I) Wuchereria bancrofti
(B) Typhoid	(II) Streptococcus pneumoniae
(C) Filariasis	(III) Entamoeba histolytica
(D) Amoebiasis	(IV) Salmonella typhi

Choose the correct answer from the options given below:

Match List - I with List - II.

LIST I (Causal Agent)	LIST II (Disease)
(A) Salmonella typhi	(I) Typhoid
(B) Streptococcus pneumoniae	(II) Pneumonia
(C) Rhino Viruses	(III) Common cold
(D) Plasmodium	(IV) Malaria

Choose the correct answer from the options given below:

Match List I with List II

List - I	List - II
(A) The cells which provide nutrition to the germ cells	(I) Interstitial cells
(B) The organ which helps in the lubrication of penis	(II) Bulbourethr al gland
(C) The pouch which helps to maintain testes temperature 2-2.5°C lower than normal internal body temperature	(III) Sertoli cells
(D) The cells which synthesise and secrete androgens	(IV) Scrotum

Choose the correct answer from the options given below:

If primary producers are exposed to 1,000,000 Joules of sunlight, the amount of energy transferred to tertiary consumers will be:

If \(A=\left[\begin{array}{ll}5 & 3 \\ 2 & 4\end{array}\right]\) then the matrix \(A^2-6 A+14 I\) (where \(I\) is an identity matrix of order 2 )

The two coherent monochromatic light beams of intensities \( I \) and \( 4I \) are superposed. The maximum and minimum possible intensities in the resulting beams are :

The degree of the differential equation \(\left(1+\frac{d y}{d x}\right)^4=\left(\frac{d^2 y}{d x^2}\right)^2\) is:

Read the paragraph given below and answer the question.
Sutton and Boveri argued that the pairing and separation of a pair of chromosomes would lead to the segregation of a pair of factors they carried. Sutton united the knowledge of chromosomal segregation with Mendelian principles and called it the chromosomal theory of inheritance. Following this synthesis of ideas, experimental verification of the chromosomal theory of inheritance by Thomas Hunt Morgan and his colleagues, led to discovering the basis for the variation that sexual reproduction produced. Morgan worked with the tiny fruit files, which were found very suitable for such studies. They could be grown on simple synthetic medium in the laboratory. They complete their life cycle in a short span of time and a single mating could produce a large number of progeny flies. Also, there was a clear differentiation of the sexes - the male and female flies are easily distinguishable. Also, it has many types of hereditary variations that can be seen with low power microscopes.
Cross performed between yellow bodied, white eyed females and brown bodied red eyed males of Drosophila results in:

Probabilities to solve a specific problem by A, B and C are \(\frac{1}{2}, \frac{1}{3}\) and \(\frac{1}{4}\ respectively. Probability that at least one will solve the problem is:

A slit is illuminated by light of wavelength \( 6500 \text{ \AA} \).
The first minimum is observed at \( \theta = 30^\circ \). The width of the slit is: