Answer : Option DExplaination / Solution:
Crop production can be increased by adopting a number of methods like using seeds of improved varieties, using modern method of agriculture, using fertilizers and pesticides. An improved seed variety is most important for better yield.
Answer : Option CExplaination / Solution:
Speciation, the formation of new and distinct species in the course of evolution. Speciation involves the splitting of a single evolutionary lineage into two or more genetically independent lineages.
Speciation maintains biodiversity both at species level and community level. New species develop from older species due to variation having more adaptive in changed habitat.
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Q9.Which phylum contain acoelomic and triploblastic animals?
Answer : Option CExplaination / Solution:
Those animals in which the developing embryo has a three germinal layer, mesoderm in between the ectoderm and endoderm, are called triploblastic animals and absence of internal body cavity is called as acoelomic.
Answer : Option AExplaination / Solution:
Sexual reproduction in flowering plants centres around the flower. Within a flower, there are usually structures that produce both male gametes and female gametes.
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Scored Mark :
Mark for Correct Answer : 1
Mark for Wrong Answer : -0.5
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