Botany - 2 (B.Sc. Agriculture)

Statement (1) is incorrect. In ‘Bt cotton and Bt brinjal’, the common term ‘Bt’ refers to as Bacillus thuringiensis, a common soil bacterium.
When Bt is placed before a plant name, such as in Bt Brinjal, it means the plant has been genetically modified to produce a protein toxic to certain insects in the same way the bacteria does.
Statement (2) is also incorrect. The twins whose bodies are joined together at birth are called conjoined/ Siamese twins.

The biggest botanical garden in Asia is in Calcutta.

 Seed germination requires both water and oxygen

It is the simplest form of cell division without forming chromosomes and is usually seen in bacteria.

This question is essentially identical to 228906. Weedicides are sprayed during the vegetative growth of weeds before flowering occurs. This prevents seed production and breaks the weed life cycle. The timing is critical - applying weedicides after flowering allows seeds to mature and disperse, reducing effectiveness.

Plantation agriculture is predominantly practiced in tropical regions due to favorable climate conditions - warm temperatures throughout the year and abundant rainfall. These conditions are ideal for cash crops like tea, coffee, rubber, cocoa, sugarcane, and spices. Semi-arid regions lack sufficient rainfall, temperate regions have seasonal limitations, and subtropical regions have more variation than optimal tropical zones.

The mode of transmission of 'Yellow mosaic disease of okra' are insects.
The mode of transmission of 'Yellow mosaic disease of okra' are insects.

Apple fruit is a pseudocarp with edible fleshy thalamus.

Helianthus annuus is the botanical name of sunflower.

Trichoderma sp. and Glioclodium fimbriatum are found in damp soils. They have an inhibitory effect on Pythium, which causes damping off disease of tobacco and chillies.

5-Bromouracil (or 5-bromo-2,4(1H,3H)-pyrimidinedione or 5-BrU or 5-BU) is a brominated derivative of uracil that acts as an antimetabolite or base analog, substituting for thymine in DNA, and can induce DNA mutation

 Centromeres line up in the equator during metaphase.Metaphase is the third phase of mitosis, the process that separates duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells.

Lime (calcium carbonate or calcium oxide) neutralizes soil acidity by raising pH levels, making nutrients more available to plants. Calcium is an element, while lime is the specific agricultural amendment applied to acidic soils.

  Indian subsidiary of Monsanto company of global seeds has developed Bt brinjal.

 Urea ia a mixed fertilizer.