a. chloroplast and cell wall
The chloroplast contains chlorophyll, which is the stuff that makes plants green. So animals do not have a chloroplast. Only plants have a cell wall and it is what helps plants maintain their shape. Hope this helped! :)
Answer:
The correct answer will be- true, all the options are correct.
Explanation:
Cactus or the species of Opuntia genus are adapted to grow on the desert conditions or the area with no water or xerophytic conditions.
The leaves of the plants become modified to take the shape of the spines which provide many advantages like protection from herbivores and providing shape to the plant.
In the species of teddy bear cactus <em>(Opuntia bigelovii)</em>, the cactus serve a third purpose that is they help in the propagation of the species. The spines possess tiny barbs at the ends which help them attach to the animal or any object that walks by and the falls of somewhere else. The fall-off portion of the cactus grow roots and form a new cactus there.
Thus, true is the correct answer.
C. Boron will become Carbon, an element with 6 protons.
Answer:
The correct option is (C). The above mentioned definition is true for biofilm that resembles a slimy structure composed of cells attached to each other.
Explanation:
The adherent cells that results due to the formation of biofilm are known to invade the slimy extracellular matrix that are made up of extracellular polymeric substances. These embedded cells serves the function of production of EPS component that is composed of genetic material, polysaccharides and lipids. These biofilms are capable of growth on the living as well as the non living things.
Formation of biofilm by the microbes occurs due to several factors namely nutritional factors, antibiotic attack and cellular recognition to the attachment site. The defined steps of the biofilm formation includes initial attachment, Irreversible attachment, Maturation I, Maturation II and Dispersion.
Answer:
Mutations rarely occur
Explanation:
Mutations are genetic changes, i.e., alterations in the DNA sequence. Generally, mutations have deleterious effects, but there are exceptions where mutations may confer an adaptive advantage in a given environment. Mutations are often deleterious, and thereby these genetic changes are rare events. In consequence, mutation rates, i.e., the frequency by which new mutations arise in an organism over time, are generally very low. Finally, mutations that arise only in germ cells can be inherited from a generation to the next generation, while somatic mutations cannot be inherited.
