Zoology MCQs for NEET — Practice Questions with Answers

In maize hybrids, the amount of lysine is often increased. Lysine is an essential amino acid that is usually deficient in maize, so breeding efforts have been made to enhance its content.

Callus formation typically occurs within 2-3 weeks during tissue culture. Callus is a mass of undifferentiated cells that forms when plant tissues are cultured in vitro under appropriate conditions.

Embryo culture is a technique used in plant breeding to rescue hybrid plantlets from interspecific crosses by growing immature or weak embryos in a nutrient medium. This method helps in overcoming barriers of cross-incompatibility and allows the development of viable hybrid plants.

Biofortification is the process of increasing the nutritional value of crops by enhancing the concentration of essential nutrients such as proteins and minerals through breeding practices. This approach aims to improve the dietary intake of these nutrients in populations that rely heavily on staple crops.

An explant is a piece of plant tissue or organ that is used in tissue culture to initiate the growth of a callus. The callus is a mass of undifferentiated cells that forms when the explant is placed in a suitable culture medium. This technique is commonly used in plant propagation and genetic engineering.