Q8 of 26 Page 1

Identify two ways in which Spirulina is helpful to mankind.

OR


Keeping beehives in crop fields has several advantages. List any two.


Spirulina is a type of blue-green algae that grows in fresh and salt water. They are useful to mankind because:


1. It is full of vitamins like Vitamin B12, Niacin, Riboflavin, Calcium, Potassium and phosphate etc.


2. It has powerful anti-inflammatory and anti-oxidant properties.


OR


Keeping beehives in crop fields has several advantages which are as follows:


1. Keeping beehives in the crop field increases the chances of pollination thereby increasing the crop yield.


2. It also helps in honey production because bees collect nectar from the flowers in the crop and produces honey from it.


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During an excavation assignment, scientists collected pollen grains of a plant preserved in deeper layers of soil. Analyse the properties of pollen grains which help in the fossilization.

 7

Protein synthesis machinery revolves around RNA but in the course of evolution it was replaced by DNA. Justify.

 9

Suryakant had banana plantation in his field. Quality of the fruit was excellent but the yield suffered due to infection of the plants by a virus. Suggest a fast and efficient method to get healthy and a large number of plants in the next generation without compromising on the existing quality. Justify the selection of your method.

 10

Besides acting as ‘conduits’ for energy transfer across trophic levels, predators play other important roles. Justify.