Biology - Online Test
Q1. A moss plant used as a fuel are
Answer : Option A
Explaination / Solution:
Species of Sphagnum, a moss, provide peat that have long been used as fuel.
Q2. The nucleus was first described by
Answer : Option B
Explaination / Solution:
Nucleus as a cell organelle was first described by Robert Brown as early as 1831.
Q3. Codon is made up of
Answer : Option A
Explaination / Solution:
A codon is a sequence of three DNA or RNA nucleotides that corresponds with a specific amino acid or stop signal during protein synthesis. A codon is a triplet.
Q4. Calvin cycle is discovered by
Answer : Option C
Explaination / Solution:
The work of Melvin Calvin is the discovery, the first CO2 fixation product was a 3-carbon organic acid. He also contributed to working out the complete biosynthetic pathway; hence it was called Calvin cycle.
Q5.
Read the following statements :
i. Pressure contributed by and individual gas in a mixture of gases is called its partial pressure
ii. in alveolar air is 45 mm Hg and in venous blood is 40 mm Hg.
Answer : Option A
Explaination / Solution:
- In a mixture of gases, each gas has a partial pressure which is the hypothetical pressure of that gas if it alone occupied the entire volume of the original mixture at the same temperature. The total pressure of an ideal gas mixture is the sum of the partial pressures of each individual gas in the mixture.
- The in alveolar air is 40 mm Hg and in venous blood is 45 mm Hg.
Q6. Which of the following fungi is used as food
Answer : Option A
Explaination / Solution:
Mushrooms are eaten by many people and large scale mushroom culture is a growing industry. It is a rich source of protein and other micronutrients.
Q7. Read the following statements :
a) India is considered as one of the 12 mega diversitycenters of the world.
b) India contributes to a high percentage of global species diversity.
a) India is considered as one of the 12 mega diversitycenters of the world.
b) India contributes to a high percentage of global species diversity.
Answer : Option D
Explaination / Solution:
The megadiverse countries are a group of countries that harbor the majority of Earth's species and high numbers of endemic species. Conservation International identified 17 megadiverse countries in 1998.
India is one of the twelvemega diversity countries of the world with bio-diversity hot spots such as Eastern Himalayaand the Western Ghats,
With only 2.4% of world's land area, India accounts for 7-8% of recorded species of the world. In terms of species richness, India ranks seventh in mammals, ninth in birds and fifth in reptiles.
Q8.
Match the names of organ having isolated endocrine cells with hormone secreted by those cells :
| Organ | Hormone |
| a) Kidney | i) angiotensin |
| b) Liver | ii) Erythropoietin |
| c) Gastro-intestinal Tract | iii) ANF |
| d) Heart | iv) CCK |
Answer : Option C
Explaination / Solution:
The atrial wall of our heart secretes a very important peptide hormone called ANF.
Angiotensin I is produced by the action of renin (an enzyme produced by the kidneys) on a protein called angiotensinogen, which is formed by the liver.
The juxtaglomerular cells of kidney produce a peptide hormone called erythropoietin.
The gastro-intestinal tract secrete peptide hormone called CCK.
Q9. Petromyzon is included under
Answer : Option D
Explaination / Solution:
Petromyzon is a jawless vertebrate and hence included under Agnatha.
Q10. Endometrium is the lining of
Answer : Option B
Explaination / Solution:
The inner lining of uterus is called endometrium. It gets ruptured at the beginning of menstrual cycle and comes out through vagina along with blood vessels. It is formed in expectation of pregnancy every month.
