Reproduction in Lower and Higher Plants — BIOLOGY STD 12 Science — Question

Why do certain genes tend to be inherited together in a cell at the time of cell division?

What are plasmids?

What is the difference in ‘tract’ and ‘nerve’?

Why is zona pellucida retained around the egg till it reaches uterus?

List any two economically important products for humans obtained from Apis indica.

If the variation occurs in population by chance alone and not by natural selection and bring change in frequencies of an allele, what is it called?

Which respiratory membranes help in gaseous exchange between the alveolar air and the blood?

Which sense is poorly developed in human beings and what is the reason for this?

Name the type of biodiversity represented by the following:

1. 1000 varieties of mangoes in India.
2. Variation in terms of potency and concentration of reserpine in Rauwolfia vomitoria growing in different regions of Himalayas.

What causes swelling of the lower limbs in patients suffering from filariasis?