Biology MCQs

Notes:
The types of inheritance are as follows:
1. Complete dominance.
2. Incomplete dominance.
3. Co-dominance.
4. Sex-linked.

Notes:
Usually, color blindness is inherited as a recessive trait on the X chromosome. This is known in genetics as X-linked recessive inheritance.

Notes:
The technique of genetic engineering crosses the limits of conventional hybridization processes.

Notes:
Transgenic plants have desirable traits like herbicide resistance. The inherited ability of an individual plant to survive the application of a herbicide that would kill a general population of the same species is called herbicide resistance.

Notes:
The gene gun technique uses gold-coated microparticles along with the DNA. Aurum is a Latin word for gold. The other metal used for this technique is tungsten.

Notes:
Most cases of filariasis are caused by the parasite known as Wuchereria bancrofti. A wide range of mosquitoes can transmit this parasite, depending on the geographic area. In Africa, the most common vector is Anopheles while in the Americas, it is Culex quinquefasciatus. Aedes and Mansonia transmits transmit the infection in the Pacific and in Asia. Thus, Culex, Aedes and Anopheles mosquitoes serve as vector for W. bancrofti in transmission of the disease. Aedes mosquito causes dengue fever. Anopheles mosquito causes malaria. Culex mosquito causes filaria. A wide range of mosquitoes can transmit the parasite, depending on the geographic area. In Africa, the most common vector is Anopheles and in the Americas, it is Culex quinquefasciatus. [This question was wrongly framed in exam as “filaria is caused by__:”. GKtoday has edited it to make it correct.]

Notes:
Coconut water, the clear liquid inside young green coconuts (fruits of the coconut palm), is liquid endosperm. In early development, it serves as a sus pension for the endosperm of the coconut during their nuclear phase of development. It contains sugars, vitamins, minerals, proteins, free amino acids and growth promoting factors.

Notes:
The transition from dormancy to germination in seeds is a key physiological process during the lifecycle of plants. Abscisic acid (ABA) is the sole plant hormone known to maintain seed dormancy. It acts through a gene expression network involving the transcription factor Abscisic Acid Insensitive 3 (ABI3).

Notes:
Pesticides are substances or mixture of substances intended for preventing, destroying, repelling or mitigating any pest. Pesticides are a special kind of products for crop protection. A pesticide is generally a chemical or biological agent (such as a virus, bacterium, antimicrobial or disinfectant) that through its effect deters, incapacitates, kills or otherwise discourages pests. Target pests can include insects, plant pathogens, weeds, molluscs, birds, mammals, fish, nematodes (roundworms), and microbes that destroy property, cause nuisance, spread disease or are vectors for disease.

Notes:
The number of muscles in the human body varies from about 656 to 850 (sometimes from 639 to around 800). An exact number is difficult to define because different sources group the muscles differently. Moreover, that some muscles, such as Palmaris longus, are not always present.