Q10 of 26 Page 1

“Pyramid of number can be upright as well as inverted.”Explain with the help of one example of each.

In most ecosystems, all the pyramids of number are upright.
For example, the producers are more in number than the herbivores and herbivores are more in number than the carnivores.


But the pyramids of number can be inverted too. For example, there are number of insects feeding on one big tree.


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List the symptoms of Ascariasis. Mention any two preventive measures you would suggest to a local population against contracting the disease.

OR


How is innate immunity different from acquired immunity? Write any two differences.


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What is Aneuploidy? Write the karyotypes of an autosomal and sex chromosomal disorders in humans.

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Why many flowering plants have developed devices to discourage self-pollination? Describe any two such outbreeding devices in plants.

 12

Justify the following statements:

(a) Banana is categorized as true fruit and a parthenocarpic fruit.


(b) Apple fruit develops only after fertilisation but is referred to as a false fruit.


(c) Castor seed is dicotyledonous and albuminous.


OR


“Seeds offer several advantages to angiosperms”. Explain.