Explanation

Joseph Grinnell was an American field biologist and zoologist. 

He is known for:

• Museum of Vertebrate Zoology Director 1908–1939
• Editor of The Condor 1906–1939

He was an early advocate of the importance of field observations.

Explanation

because amoeba moves with the help of microfilaments

Microfilaments (actin filaments) are the filaments that are present in the cytoplasm of the cells (eukaryotic) and they forms a part of the cytoskeleton

Explanation

The excluded volume is represented by "b"

Concept:

The constant 'b' is the van der Waals constant for correction in volume.

It is also known as the excluded volume or co-volume.

The numerical value of 'b' is found to be four times the actual volume occupied by the gas molecules.

Formula:

Excluded volume or co-volume equals (V−nb) for n moles.

Reason: Co-volume depends on the effective size of gas molecules.

Explanation

Hydrogen bonds must be broken for water to evaporate.

Water molecules with high kinetic energy evaporate; the remaining molecules are cooler.

Explanation

It is a white crystalline solid and is a laboratory reagent and a molecular compound that is very toxic to humans

Mercuric Chloride is an odorless, white crystal or powder.

It is used in preserving wood, photography, embalming, fabric printing, and analytical chemistry, and as a disinfectant, fungicide and insecticide

Explanation

when a donor impurity interacts with a pure crystal, it leads to the formation of an n-type semiconductor.

Concept:

The process of deliberate addition of a desirable impurity to a pure semiconductor so as to increase its conductivity is called doping

The impurity atoms added are called doped. 

Semiconductors doped with the impurity atoms are called extrinsic.

Explanation:

The element whose atom has five valance electrons are called pentavalent impurities e.g As, P, Sb, etc

These impurities are called donor impurities because they donate an extra free electron.

The semiconductor material with the majority carrier as the electron is called an n-type semiconductor

Explanation

Cnidarians have a soft sac-like body, which consists of two cell layers:

an outer ectoderm and an inner endoderm.

Therefore Cnidaria are diplobastic.

The endoderm lines the central cavity or enteron.

Explanation

From group 1 elements, K, Rb, and Cs can form Superoxide (MO2).

Explanation

Ionic reactions are very fast because they break bonds and form free ion

so they do not need the breakdown and the reaction is very fast On the other hand covalent bond is required to break their bond first so the reaction is low

Explanation

Therefore +2 (K) + x (Mn) + -8 (O) = 0 which means x = +6

so the oxidation number of Mn is +6 in K2MnO4.