Which of the following causes epidemic dropsy in humans?
1. Eichhornia crassipes
2. Parthenium hysterophorus
3. Lantana camara
4. Argemone mexicana

Consider the following statements (a-d) about organic farming 
a. Utilizes genetically modified crops like Bt cotton.
b. Uses only naturally produced inputs like compost.
c. Does not use pesticides and urea.
d. Produces vegetables rich in vitamins and minerals.

Which of the above statements are correct?

1. (a) and (b) only
2. (b), (c) and (d)
3. (c) and (d) only
4. (b) and (c) only 

A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called         
1. Ley farming
2. Contour farming
3. Strip farming
4. Shifting agriculture 

Why is vivipary an undesirable character for annual crop plants
1. It reduces the vigor of the plant.
2. The seeds exhibit long dormancy.
3. It adversely affects the fertility of the plant.
4. The seeds cannot be stored under normal conditions for next season.

 

The reason why vegetatively reproducing crop plants are best suited for maintaining hybrid vigor is that          (CBSE-PMT 1998)
1. They can be easily propagated.
2. They have a longer life pan.
3. They are more resistant to diseases.
4. Once a desired hybrid is produced, there are no chances of losing it.

 

Which one is a neem product used as insect repellent?
1. Rotenone
2. Azadirachtin
3. Parathion
4. Endrin

In maize, hybrid vigor is exploited by      
1. bombarding the protoplast with DNA
2. crossing of two inbred parental lines
3. harvesting seeds from the most productive plants
4. inducing mutations 

All the varieties of sugarcane being cultivated today are:
1. androgenic haploids
2. interspecific hybrids
3. pureline inbred stocks
4. transgenics

Wild varieties of plants must be conserved to
1. Maintain ecosystem
2. Feeding wild animals
3. Future evolution
4. Incorporate useful traits in future crop varieties

A collection of plants and seeds having diverse alleles of all the genes of a crop is called           
1. Genome
2. Herbarium
3. Germplasm
4. Gene library