Koshland's theory of enzyme action is known as the "Induced fit theory."

The absence of pores in the brain capillary endothelium is the reason for the complicated penetration of some drugs through the brain-blood barrier.

Depending on the pathogen responsible and the severity of disease, central nervous system (CNS) infections cause an increase in the permeability of the blood-CSF/blood-brain barrier and/or a decrease of the CSF flow (216), frequently leading to an increase of drug concentrations in the central nervous compartments during inflammation.

Stigma, ovary and styleconstitutes female part of a flower.

It is made of three parts - Stigma, ovary and style.The swollen bottom part is the ovary, the middle elongated part is the style and the terminal part which may be sticky is the stigma.

The terminal stigma serves as the landing platform for the pollen grains, these are then taken to the ovary via the elongated tube-like structure style.The ovary contains ovules and each ovule has an egg cell.

The correct match is(iii), (iv), (ii), (i).

(a) Pila is a Mollusc. The mouth contains a file -like rasping organ for feeding called a radula.

(b) Bombyx is an Arthropod. In Bombyx excretion takes place through Malpighian tubules.

(c) Pleurobrachia is Ctenophore. The body bears eight external rows of ciliated comb plates, which help in locomotion.

(d) Taenia is a platyhelminth specialised cells called flame cells that help in osmoregulation and excretion.

Logistic growth occurs when there is limited resource availability condition.
Exponential growth occurs when there is unlimited resource availability condition.
Expanding age pyramid reflects growing population where the percent individuals of pre-reproductive age is largest followed by reproductive and post-reproductive age groups.
Stable age pyramid shows stable population where the percent individuals of pre-reproductive and reproductive age group are same.

Amensalism is an interaction between two organisms of different species in which one species inhibits the growth of other species by secreting certain chemicals. The first species is neither get benefited nor harmed.
• (+) : (0) interaction is observed in commensalism
• (+) : (+) interaction is observed in mutualism.
• (–) : (–) interaction is seen in competition

Nerve impulse from the cochlea arrive first in Medula oblongata region of the brain.

The medulla oblongata or simply the medulla is the most caudal part of the brainstem between the pons superiorly and spinal cord inferiorly. Medulla oblongata is the transition from the spinal cord to the brain, it ends at the foramen magnum or the uppermost rootlets of the first cervical nerve and to which cranial nerves VI to XII are attached. Medulla oblongata contains the vital autonomic cardiovascular and respiratory centers controlling heart rate, blood pressure, and breathing.

In-plant mineral nutrition, elements are called macro or micro-elements depending upon their relative amount required in plants.

There are some nutrients that are required in large amounts, which are called macronutrients like nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur are macronutrients.

There are about seven nutrients essential to plant growth and health that are only needed in very small quantities/amounts. In plants, micronutrients are boron (B), chlorine (Cl), copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo), and zinc (Zn).

Thus, macro or micro-elements depends on the relative amount required in plants.

In Krebs Cycle six-carbon compounds like Citric acid converts into Oxalo succinic acid which is five-carbon compound and it forms Malic acid which further reacts and forms Oxaloacetic acid which is both four-carbon compound. Therefore in each stem carbon is released in the form of carbon dioxide and the process is known as decarboxylation.

Significanceof classification is:

• It makes the study of such a wide variety of organisms easy.
• It projects before us a good picture of all life forms at a glance.
• It helps us understand the inter-relationship among different groups of organisms.
• It serves as a base for the development of other biological sciences such as biogeography etc.
• Various fields of applied biology such as agriculture, public health, and environmental biology depend on the classification of pests, disease vectors, pathogens and components of an ecosystem.