Biology:2005:CBSE:[Delhi ]:Set-III
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Q1
What is Chemotaxis? Marks:1View AnswerAnswer:
Out of syllabus -
Q2
Mention two characteristics of a species that make it susceptible to extinction. Marks:1View AnswerAnswer:
i) Low reproductive rate. ii) Large body size. -
Q3
Name the respective secretions of Goblet cells and Parietal cells in human stomach. Marks:1View AnswerAnswer:
Goblet cells secrete mucus and Parietal cells secrete hydrochloric acid.
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Q4
What happens in lymphoid organs with respect to immunity? Marks:1View AnswerAnswer:
Maturation and proliferation of lymphocytes occur in lymphoid organs. -
Q5
Name the two most biodiversity-rich zones of India . Marks:1View AnswerAnswer:
North–East region and Western Ghats . -
Q6
Due to uncontrolled excessive hunting the population of tigers in a forest becomes zero. Discuss the long-term effects of this situation on the population of deer in that forest. Marks:2View AnswerAnswer:
Due to the zeroing of tigers population, their will be an increase in the prey population .This will lead to shortage of herbage . Absence of a predator will also cause an increase in the conflict for resources for the deer population. -
Q7
Name the source gland of luteinising hormone (LH). Mention the other hormone along with which it acts on its target cells/organ. Give their two functions. Marks:2View AnswerAnswer:
Luteinising hormone(LH) is secreted by the pituitary gland. It acts on the testis and ovary along with Follicle stimulating hormone(FSH) to regulate the reproductive process. Two of it's functions include-
1. LH acts on the leydig cells of testis to cause production of testosterone in males.
2. LH stimulates follicular development and estrogen secretion in the ovary. -
Q8
What do you call the circulatory fluid in the body of cockroach? Mention its three functions. Marks:2View AnswerAnswer:
Out of syllabus -
Q9
What is thermal stratification? How does thermal stratification in temperate lakes help in rich growth of phytoplankton during autumn and spring turn-over? Marks:2View AnswerAnswer:
Thermal stratification is the difference of temperature at different depths or layers. Due to gradual changes in the temperature called as themocline an upper layer epilimnion and the lower layer hypolimnion are created in a lake. During autumn and spring turn over due to redistribution of oxygen and nutrients a rich growth of phytoplankton take place. -
Q10
Where do PGA and glycine gain entry respectively after being formed during photorespiration in plants? What happens to them immediately after? Marks:2View AnswerAnswer:
Out of syllabus
