6027.Plant cells can usually be distinguished because only plant cells possess
Cell walls and mitochondria
Golgi bodies and central vacuoles
Cell walls and central vacuoles
Chromosomes and mitochondria
6070.Which of the following plant diseases is caused by a virus?
Aster yellows
Barley yellow dwarf
Curly top of sugar beets
All of the above
6083.Which of the following plants is not capable of manufacturing own food?
Algae
Mushroom
Carrot
Cabbage
6085.Biomass energy is
formed through photosynthesis
caused by heat due to the large mass of the earth
has been used for only a few years
is effective in only certain regions of India
6091.Consider the following:
1. Photosynthesis
2. Respiration
3. Decay of organic matter
4. Volcanic action
Which of the above add carbon dioxide to the carbon cycle on Earth?
1. Photosynthesis
2. Respiration
3. Decay of organic matter
4. Volcanic action
Which of the above add carbon dioxide to the carbon cycle on Earth?
1 and 4 only
2 and 3 only
2, 3 and 4 only
1, 2, 3 and 4
6139.A genetically engineered form of brinjal, known as the Bt-brinjal, has been developed. The objective of this is
To make it pest-resistant
To improve its taste and nutritive qualities
To make it drought-resistant
To make its shelf-life longer