Reproduction in Organisms Important Questions for CBSE Class 12 Biology Sexual Reproduction 1.All organisms have to reach a certain stage of growth and maturity in their life cycle before they reproduce sexually. 2.Life cycle of an organism is divided into the following three phases: (i)Juvenile or vegetative phase - Pre-reproductive period (ii)Reproductive phase — … [Read more...]
Important Questions for CBSE Class 12 Biology Reproduction
Reproduction in Organisms Important Questions for CBSE Class 12 Biology Reproduction 1.The period between birth and natural death of an organism is called its lifespan. It can vary from less than a day to more than 400 yrs. Whatever be the lifespan, death of every individual organism is a certainty, i.e. no individual is immortal, except single-celled organisms. Lifespan of … [Read more...]
Important Questions for CBSE Class 12 Biology Population
Organisms and Populations Important Questions for CBSE Class 12 Biology Population 1.Population can be defined as the total number of individuals of a species in a specific geographical area, which can interbreed under natural conditions to produce fertile offsprings and function as a unit of biotic community. 2.Population ecology is an important area of ecology as it links … [Read more...]
Important Questions for CBSE Class 12 Biology Ecosystem-Structure and Function, Productivity and Decomposition
Ecosystem Important Questions for CBSE Class 12 Biology Ecosystem-Structure and Function, Productivity and Decomposition 1. An ecosystem is a functional unit of nature, where living organisms interact among themselves and also with the surrounding physical environment. The word ‘Ecosystem’ was coined by Sir AG Tansley (1935). 2. The size of an ecosystem varies greatly from … [Read more...]
Important Questions for CBSE Class 12 Biology Post-Fertilisation : Structures and Events
Sexual Reproduction in Flowering Plants Important Questions for CBSE Class 12 Biology Post-Fertilisation : Structures and Events 1.After double fertilisation, the following changes occur: (i)Endosperm and embryo development. (ii)Maturation of ovule(s) into seed(s). (iii)Maturation of ovary into fruit. These are collectively termed post-fertilisation … [Read more...]