(i) What is the mass of cells released by sponges called? How does it help in reproduction? |
(ii) Mention one dissimilarity between a zoospore and a conidium. |
Why do the self-pollinated crops not show the ill-effects of inbreeding depression? |
Or |
Fungus Trichoderma polysporum proved to be very essential to organ transplant patients. Give reason. |
(i) What are floes formed during secondary treatment of sewage? |
(ii) A small part of the activated sludge is pumped back into aeration tank during secondary treatment of sewage. Give reason. |
(iii) What value are shown by Hari? |
(i) Viviparity is considered to be more evolved than in comparison to oviparity. Justify. |
(ii) What is 'Panspermia theory' of origin of life? |
Give reasons for the following. |
(i) Neutrophils and macrophages are called soldiers and scavengers of the body. |
(ii) One should avoid driving after consuming alcohol. |
(iii) Give the scientific name of the pathogen causing malignant malaria in humans. |
Or |
(i) Mutations can be beneficial in plant breeding. Justify the statement with the help of an example. |
(ii) Discuss briefly the technology that made us self-sufficient in food production during green revolution. |
(i) How many codons code for amino acids and how many do not? |
(ii) Explain aminoacylation of the tRNA. |
(i) Mention the role of bioreactors? |
(ii) What do you understand by a continuous culture system for production of desired product? |
(i) It is a correct judgement regarding the biological father of the child? Justify with your knowledge of genetics. |
(ii) Indicate the value(s) exhibited by the judge. |
(i) Write your observations on the variations seen in the Darwin's finches shown below. |
(a) |
(b) |
(c) |
(d) |
(ii) How did Darwin explain the existence of different varieties of finches on Galapagos islands? |
Describe the function of two pituitary and two ovarian hormones in the menstrual cycle of human female. |
Or |
Explain by giving reasons for the following. |
(i) Most zygotes in angiosperms divide only after certain amount of endosperm is formed. |
(ii) Groundnut seeds are exalbuminous and castor seeds are albuminuous. |
(iii) Micropyle remains as a small pore in the seed coat of a seed. |
(iv) Integuments of an ovule harden and the water content is highly reduced as the seed matures. |
(v) Apple and cashewnuts are called false fruits. |
(i) State two major causes of air pollution. |
(ii) Mention the reason for making the buses of Delhi to run on CNG by the end of the year 2002. |
(iii) Draw a labelled diagram of electrostatic precipitator that is used to remove fine particles from a flowing gas using the force of an induced charge. |
Or |
(i) An ecological succession is known to be a sequential, gradual and a predictable change in the species composition over a period of time. Define the following terms related to succession. |
(a) Pioneer species |
(b) Sere |
(c) Ecological succession |
(d) Climax community |
(ii) What is parasitism? |
Drugs like LSD, barbiturates, amphetamines, etc., are used as medicines to help patients with mental illness. However, excessive doses and abusive usage are harmful. Enumerate the major adverse effects of such drugs on humans. |
Or |
What is the mechanism by which AIDS virus causes deficiency of immune system of the infected person? |
You need to login to perform this action.
You will be redirected in
3 sec