Biology Quiz 4

All eukaryotic cells have a surrounding plasma membrane (cell membrane). The plasma membrane is made up of a phospholipid bilayer with embedded proteins that separate the internal contents of the cell from its surrounding environment.

Allopathy is the branch of medicine involving synthetic chemical compounds. It is the treatment of disease by conventional means, i.e. with drugs having effects opposite to the symptoms.

The mineral constituent of chlorophyll is Magnesium (Mg). The chlorophyll molecule consists of a central magnesium atom surrounded by a nitrogen-containing structure called a porphyrin ring; attached to the ring is a long carbon-hydrogen side chain, known as a phytol chain. Other elements (not minerals) like carbon, nitrogen, oxygen and hydrogen are also present in chlorophyll.

An artificial ecosystem is not self-sustaining, and the ecosystem would perish without human assistance. An aquarium is an artificial ecosystem. In aquarium, all the factors are regulated according to choice. These factors are type of species, food, sunlight and temperature, etc. Without humans, this ecosystem could not sustain itself.

The vector of disease sleeping sickness is tsetse fly. Sleeping sickness (African Trypanosomiasis) is caused by microscopic parasites of the species Trypanosoma brucei. It is transmitted by the tsetse fly (Glossina species).

Commercially important cotton fibres are epidermal hairs of seeds. The cotton is found to grow around the seed coat of the cotton (Gossypium) plant.

Protein is most important for the growth of children up to the age of 14 as during the teenage, children experience rapid changes in their physical development. Protein is a slow-digesting nutrient, which is needed for the repair and growth of muscles and tissues. It is also essential for the production of enzymes and hormones.

The locomotory organ of Amoeba is Pseudopodia or false feet. Pseudopodia is a temporary or semipermanent extension of the cytoplasm, used in locomotion and feeding by all sarcodine protozoans and some flagellate protozoans.

Maximum harm to a tree is caused by the loss of all leaves because leaves produce food through the process of photosynthesis. The plant can survive without leaves for few days as the stored food in roots and stems helps to execute all the food requirements of that plant. If a plant loses its leaves, it will usually generate new ones.

Allantois of Embryo helps in excretion. The allantois is a hollow sac-like structure filled with clear fluid that forms part of a developing amniote's conceptus (which consists of all embryonic and extra-embryonic tissues). It helps the embryo exchange gases and handles liquid waste.