Smack is chemically:

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:

Match List-l with List-II

List l (Habitat)	List-II (Animal)
(A) Sunderbans	(I) Lion
(B) Periyar	(II) Wild ass
(C) Rann of Kutch	(III) Bengal tiger
(D) Gir	(IV) Elephant

Choose the correct answer from the options given below:

Which one of the following hormones is related to spermatogenesis?

Match List I with List II

List I	List II
A. Commensalism	Balanus and Chthamalus
B. Mutualism	Mycorrhizae and legume plants
C. Parasitism	Cuscuta on hedge plants
D. Competition	Sea anemone and clownfish

Choose the correct answer from the options given below:

Identify the statements which hold true with respect to origin of life.
(A) Louis Pasteur demonstrated that life comes only from pre-existing life.
(B) Big Bang theory attempts to explain the origin of universe.
(C) Oparin and Haldane proposed first form of life came from pre-existing non-living organic molecules.
(D) Miller's experiment was unable to prove chemical evolution.

Read the given passage and answer the following questions:
Secondary treatment or biological treatment: The primary effluent is passed into large tanks where air is pumped into it. This allows vigorous growth of aerobic microbes. While growing, these microbes consume the major part of the organic matter in the effluent. This significantly change the BOD (biochemical oxygen demand) of the effluent. The effluent in then passed into a tank a small part of the sludge is pumped back into the aeration tank to serve as the inoculum. The remaining major part of the sludge is pumped into large tanks called sludge digesters. Here, other kinds of bacteria grow anaerobically in the sludge. The biogas produced can be used source of energy as it is inflammable. The effluent from the secondary treatment plant is generally released into natural water bodies like rivers and streams.
The biogas is a mixture of the following gases

A solution containing \(10 g / dm ^3\) of urea \(\left( NH _2 CONH _2\right)\) is isotonic with a 10 % solution of a non-volatile solute. The molecular mass of the solute is :

A metallic wire of resistance \( R \) and resistivity \( \rho \) is cut into six equal parts. Now each part is stretched to six times its length. The new resistance and resistivity of each part will be :

Which structure in the microsporangium provides nourishment to pollen grains?

Which of the following statements is correct for the galvanic cell?

Composition of German silver alloy is :

Given below are two statements :
Statement (I) : In a ground wave communication system, low frequency signal (< 2 MHz) can be transmitted.
Statement (II) : If frequency is high then it will induce electrical signal on the surface of the earth and so attenuation takes place.
In the light of the above statements, choose the most appropriate answer from the options given below :