Biology Test 362

Statements 1 and 2 are correct. Statement 3 is incorrect because the PNS transmits impulses both to and from the CNS, and statement 4 is incorrect because the autonomic system controls involuntary actions.

Biological control method adopted in agricultural pest control are based on the ability of predator to regulate prey population.

Correct answer: B.

Age structure is the percentage of individuals in different age groups within a population.

These age groups are commonly divided as pre-reproductive, reproductive and post-reproductive classes.

Age structure is often represented graphically as an age pyramid. The shape of this pyramid helps indicate whether the population is growing, stable, or declining.

Option A describes rates (birth rate and death rate), not the age composition. Option C gives the total population size, which is different from age composition. Option D refers to migration rate, which is a measure of movement and not the distribution of ages.

Therefore, the statement that best defines age structure is option B.

If all members fo a host species die the parasite that obtain their food from the particular host also die off due to lack of food. This represent co-existence of species.

Hormones that don’t enter the target cell bind to membrane receptors, typically because they are polar or large, like peptide hormones. Lipid-soluble hormones, such as steroids and thyroid hormones, enter the cell. Cortisol, Iodothyronine (thyroid hormone), Testosterone, and Estradiol are lipid-soluble and enter the cell. FSH, Insulin, and Glucagon are peptide hormones that bind to membrane receptors and do not enter the cell. Thus, three hormones (FSH, Insulin, Glucagon) do not enter the cell.

The place where a particular organism lives called a habitat.

• It is a place where an organism can find shelter, food, mates for reproduction and, protection from predators.
• It depends on both biological and physical factors present within it.

The “active chemical drug reserpine” is obtained from Rauwolfia.

Reserpine is an “indole alkaloid” obtained from the roots of “Rauwolfia serpentine” and “Rauwolfia vomitoria”. It was first isolated from the dried roots of Rauwolfia in 1950. It is widely used as an antihypertensive and antipsychotic drug. It is an adrenergic blocker.

Rauwolfia serpentina:

Pituitary dwarf hormone will show normal intelligence, stunned growth and inhibited growth of long bones. Pituitary dwarfs will no show mental retardation.

The Father of Ecology in India is Ramdeo Misra.

• Raja Ram Mohan Roy was a freedom fighter.
• Verghese Kurien is the Father of the White Revolution of India while MS Swaminathan is the Father of Green Revolution of India.

Decomposition is the process by which decomposers like fungi and bacteria break down complex organic matter into simpler inorganic substances such as carbon dioxide, water, and nutrients.