Biology MCQs

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Ovaries are the female reproductive organs that are responsible for producing various hormones and produce female gametes.

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Into three structural regions is the oviduct divided: ampulla, isthmus, and infundibulum

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Ringworm or round red or silver type superficial fungal infections of the skin are caused by species of Trichophyton, Microsporum, and Epidermatophyton. There are dry scaly lesions on the skin, nails, and scalp that cause intense itching.

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The root nodules for nitrogen fixation of a non-legume tree are Frankia. It is a genus of nitrogen-fixing bacteria that live in symbiosis with actinorhizal plants.

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The brain’s limbic system controls emotional expression through the hypothalamus, which has control over the body’s emotional responses systems. The hypothalamus is responsible for regulating hunger, thirst, response to pain, levels of pleasure, sexual satisfaction, anger and aggressive behavior, etc. It also regulates pulse, blood pressure, breathing, and arousal in response to emotional circumstances.

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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.

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Cotton is the most popular of the BT crops. In BT cotton, BT gene was isolated and transferred from a bacterium Bacillus thurigiensis to American cotton. The American cotton was subsequently crossed with Indian cotton to introduce the gene into native varieties. The BT cotton variety contains a foreign gene obtained from Bacillus thuringiensis. This bacterial gene, introduced genetically into the cotton seeds, protects the plants from bollworm (A. lepidoptora), a major pest of cotton.

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Colour blindness is a sex-linked recessive disorder that causes failure in a person to differentiate and distinguish different colours such as red and green. Colour vision deficiency, commonly called colour blindness, results from a malfunction or absence of cone cells in the retina. Cone cells are one of three types of photoreceptor cells in the retina of the human eye that are responsible for colour vision and function best in relatively bright light. Colour blindness can occur when one or more of the colour cone cells are absent, nonfunctioning, or detect a different colour than normal.

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Yeasts, moulds (molds), and mushrooms are examples of fungi. Mushrooms are another group of fungi, which are mainly Basidiomycetes and partially Ascomycetes, both of which share a same feature — having a macroscopic “Fruiting-body, a Mushroom”. Yeasts are eukaryotic, single-celled micro organisms classified as members of the fungus kingdom.

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Blood group AB individuals have both A and B antigens on the surface of their RBCs, and their blood plasma does not contain any antibodies against either A or B antigen. Therefore, an individual with type AB blood can receive blood from any group (with AB being preferable), but cannot donate blood to either A or B group. They are known as universal recipients.