The viability of seeds is tested by

Vavilov's centres of origin of crop plants are located in

Biodiversity loss occurs due to the reasons given below

$(i)$ Habitat loss and fragmentation

$(ii)$ Co-extinction

$(iii)$ Over-exploitation

$(iv)$ Alien species invasion

Identify the correct reasons

Explant is required to be disinfected before placing in culture. This is done by

Cocoa is the plant from which chocolate is made. Which part is used to extract it?

Bean seeds were planted and put on a sunny windowsill. As the plants grew, their stems bent toward the window. This bending was most likely caused by an