Exine of pollen grain is made up o
pectocellulose
lignocellulose
sporopollenin
pollen kit
C.
sporopollenin
Pollen grains are spherical in shape. They are 25-50 micrometres in diameter. It has a prominent two-layered wall. The hard outer layer called the exine is made up of
sporopollenin. It can withstand high temperatures and strong acids and alkali. Pollen grains are well preserved as fossils because of the presence of sporopollenin. Pollen grain exine has prominent apertures called germ pores, where sporopollenin is absent. The inner wall of the pollen grain, intine is a thin and continuous layer made up of cellulose and pectin.
Which of the following diseases is related to cadmium pollution?
Minamata
Pneumoconiosis
Anaemia
Itai- Itai
First genetically modified plant commercially released in India is
golden rice
slow ripening tomato
Bt brinjal
Bt cotton
MRI is not allowed in the following conditions except one. Identify the exception
Presence of pacemaker in the body
Pregnant women
Person suffering from stroke
Presence of metallic plate in the body for treatment of broken bones
Micropropagation is a technique for production of
true to type plants
haploid plant
somatic hybrids
somaclonal plants
Balbiani rings are the sites of
DNA replication
RNA and protein synthesis
synthesis of lipids
synthesis of polysaccharides
Root cells of wheat has 2n = 42 chromosomes. Which one of the following is the basic chromosome number of wheat?
42
21
7
14
Test cross is a cross between
hybrid and dominant parent
hybrid and recessive parent
two hybrid parents
two distantly related species
