Biology - Online Test
Q1. New cells generate from
Answer : Option C
Explaination / Solution:
All living organisms are composed of cells and products of cells.all cells arise from pre-existing cells.
Q2. Genetic information is carried out by long chain molecule made up of
Answer : Option C
Explaination / Solution:
Genetic information is carried out by DNA and RNA. Both DNA and RNA are called genetic material, made up of long chain of nucleotide having- nitrogenous base, sugar and phosphate ions.
Q3. Flow of energy in our ecosystem takes place
Answer : Option A
Explaination / Solution:
In ecosystem, flow of energy takes place in only one direction. The flow of energy takes place from producers to final consumers. Energy present in one trophic levels nevers return back to producer.
Q4. The chief pigment associated in process of photosynthesis is
Answer : Option C
Explaination / Solution:
Chlorophyll a, shows higher rate of photosynthesis.so, chlorophyll a is the chief pigment associated with photosynthesis.
Q5. Tracheal tube divides into right and left bronchi at the level of :
Answer : Option A
Explaination / Solution:
Trachea divides at the level of 5th thoracic vertebra into a right and left primary bronchi.
Q6. Best method to increase crop yield is
Answer : Option D
Explaination / 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.
Q7. Speciation maintains biodiversity
Answer : Option C
Explaination / 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.
Add image here
Q8. Which phylum contain acoelomic and triploblastic animals?
Answer : Option C
Explaination / 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.
Q9. Flower is the site of
Answer : Option A
Explaination / 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.
Q10. Which of the following is a primary sex organ of female?
Answer : Option C
Explaination / Solution:
Ovary is the primary sex organ of female reproductive system in human beings. Egg is released from one of the ovary each month. It also release hormone.
