The density of a population in a given habitat during a given period, fluctuates due to changes in -
(A) Natality
(B) Immigration
(C) Emigration
(D) Mortality
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Match List-I with List-II

List-I (Strategies of an organism)	List-II (Example)
(A) Organisms breed only once in their lifetime	(I) Desert lizard
(B) Organisms breed many times during their lifetime	(II) Oysters
(C) Organisms produce large number of small sized offspring	(III) Salmon fish and bamboo
(D) Some organisms show behavioral responses with variation in their environment	(IV) Birds and mammals

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Select the correct statements regarding the menstrual cycle in females:
(A) The first menstruation begins at puberty and is called menopause.
(B) Ovulation occurs mid-cycle (around day 14) when progesterone level is maximum.
(C) In absence of fertilization, corpus luteum degenerates and causes breakdown of endometrium, starting a new cycle.
(D) In humans, menstrual cycle stops around the age of 50 years.
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Match List-l with List-ll

List-l (Microorganisms)	List-II (Commercial Uses)
(A) Lactobacillus	(I) Use for the production of butyric acid
(B) Saccharomyces cerevisiae	(II) Use for production of swiss cheese
(C) Propionibacterium sharmanii	(III) Use for making bread
(D) Clostridium butylicum	(IV) Improves nutritional quality of milk by increasing vitamin B12

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Steps of Polymerase Chain Reaction (PCR) are given below. Arrange them in the correct sequence.
A. Annealing of primers to the template DNA
B. Isolation of gene of interest
C. Extension of primer end on the template DNA using Taq polymerase
D. Denaturation of template DNA by heating
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Which of the following biofertilisers are free living in the soil?
(A) Anabaena
(B) Azospirillum
(C) Rhizobium
(D) Azotobacter
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Baculoviruses are pathogens that attack insects and other arthropods. These viruses belong to the genus:

The unit vector in the direction of \(\vec{a}+\vec{b}\) if \(\vec{a}=2 \hat{i}-\hat{j}+2 \hat{k} \& \vec{b}=-\hat{i}+\hat{j}-\hat{k}\) is:

Which of the following are correct?
(A) For a square matrix \(A\), if \(A^3=I\), then \(A^{-1}=A^2\).
(B) The determinant of only a square matrix can be defined.
(C) If \(A\) is a square matrix of order 3 , then the number of minors of the matrix \(A\) is 3 .
(D) If \(A\) and \(B\) are two non-singular matrices of the same order, then \((A B)^{-1}=B^{-1} A^{-1}\).
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Choose the correct statements for a zero order reaction
(A) The rate of the reaction is independent of the initial concentration of the reactant
(B) The rate of the reaction increases linearly as the initial concentration of the reactant is increased
(C) The plot of concentration against time is a straight line with a positive slope
(D) The unit of rate constant is mol \(L^{-1}s^{-1}\)
Choose the correct answer from the options given below:

Sap of which plant is fermented to produce 'Toddy' in southern India ?

Read the following passage carefully and answer the given questions
The earthworm is referred to as the farmer's friend. This is because they help in the breakdown of complex organic matter as well as in loosening of soil. Similarly, decomposers break down complex organic matter into inorganic substances like carbon dioxide, water and nutrients and the process is called decomposition. Dead plant remains such as leaves, bark, flowers and dead remains of animals, including fecal matter, constitute detritus, which is the raw material for decomposition. Some of the steps in the process of decomposition are fragmentation, catabolism, leaching, humification etc.
The process of breaking down of detritus into smaller particles is called:

An inverted pyramid of biomass can be found in which of the following ecosystem?