Arrange the trophic levels in an order from lowest to highest in a terrestrial food chain:
(A) Wolf
(B) Grass
(C) Cow
(D) Lion
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Which of the following is a free living, effective biocontrol agent, found very often in the root ecosystem?

Identify the correct statements with respect to human evolution
A. Modern Homo sapiens arose during ice age between 50,000 to 75,000 years.
B. Ramapithecus was more man-like.
C. The brain capacity of Homo erectus was about 650-800 cc.
D. Dryopithecus was more ape-like.
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Read the passage carefully. Attempt the questions.
An overwhelming majority (99 per cent) of animals and nearly all plants cannot maintain a constant internal environment. Their body temperature changes with the ambient temperature. In aquatic animals, the osmotic concentration of the body fluids change with that of the ambient air and water osmotic concentration. These animals and plants are simply conformers. Considering the benefits of a constant internal environment to the organism, we must ask why these conformers had not evolved to become regulators. Recall the human analogy we used above; much as they like, how many people can really afford an air conditioner? Many simply 'sweat it out' and resign themselves to suboptimal performance in hot summer months. Very small animals are rarely found in polar regions. During the course of evolution, the costs and benefits of maintainin a constant internal environment are taken into consideration. Some species have evolved the ability to regulate, but only over a limited range of environmental conditions, beyond which they simply conform.
If the stressful external conditions are localised or remain only for a short duration, the organism has five other alternatives for survival.
Conformers are the animals whose body temperature:

Sex in human embryo is determined by:

Match List-l with List-II

List-l (Evolutionary stages of human species)	List-II (Time of existence/evolution)
(A) Dryopithecus	(I) 100,000-40,000 years ago
(B) Australopithecines	(II) About 1.5 million years ago
(C) Homo erectus	(III) About 2 million years ago
(D) Neanderthal man	(IV) About 15 million years ago

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Arrange the following steps of gel electrophoresis in correct order.
A. DNA fragments were forced to move towards anode under electric field through agarose gel
B. Staining DNA fragments with Ethidium Bromide.
C. DNA fragments separated according to their size.
D. Visualising them in UV rays
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The maximum value of the \(f(x)=\frac{1}{4 x^2+2 x+1}\) is :

Let \(R\) be a relation on the set of integers given by \((x, y) \in R \Longleftrightarrow|x-y| \leq 1\). Then \(R\) is
(A) Reflexive relation
(B) Symmetric relation
(C) Transitive relation
(D) \(R\) is not a function
(E) Empty relation
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An electric dipole of moment P is placed along the direction of electric field E. The work done in deflecting the dipole through 180° is equal to

Which one of the following plants is the source of cannabinoids commonly used in drug abuse?

Identify the hormone, which is NOT produced during pregnancy in women.

Bacillus thuringiensis produces proteins (Bt toxin) that kill certain insects. Identify the correct statements.
(A) Bt toxin protein exists as an inactive form (protoxin) in Bacillus thuringiensis.
(B) Bt toxin protein exists as an active form toxin in the insect gut.
(C) The alkaline pH of the gut of an insect solubilize the toxin and converts in an inactive form.
(D) The toxin is coded by a gene crylAc named cry.
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