Biology - Online Test
Q1. Amount of biomass produced per unit area by green plants is called:
Answer : Option C
Explaination / Solution:
Primary productivity refers to the degree to which autotrophic organisms (primarily plants and algae) convert energy into organic substances through photosynthesis or chemosynthesis. Since the process of photosynthesis consumes carbon dioxide and produces oxygen, it is of great importance to the environment. Primary productivity refers to the amount of carbon-fixing biomass produced.
Q2. The substances that have ability to absorb light at different specific wavelength are
Answer : Option B
Explaination / Solution:
Pigments are substances that have an ability to absorb light, at specific wavelengths. The chlorophylla pigment absorb lights of different wavelengths.
Q3. Which one of the following is wrong statement with respect to the functions of respiratory system?
Answer : Option B
Explaination / Solution:
The function of respiratory system does not deal with the cleaning up of the air.
Q4. The method of producing thousands of plants through tissue culture is called
Answer : Option A
Explaination / Solution:
The method of producing thousands of plants through tissue culture is called micro propagation. In this method, small part of plant is kept in nutrient medium along with plant hormones.
Q5. When we will move away from the equator towards poles, we will find
Answer : Option C
Explaination / Solution:
When we will move away from the equator towards poles there is a gradual decrease in the species diversity. This is because climatic condition becomes gradually adverse as we move from equator to poles.
Q6. Alimentary canal is absent in
Answer : Option D
Explaination / Solution:
Alimentary canal is absent in Taenia solium. Taenia solium is a obligate parasite and obtain digested food from small intestine of human being as well as pigs. Pick the animals with true placenta
Q7. Monoecious flowers contain
Answer : Option D
Explaination / Solution:
Monoecious flowers contain both male and female reproductive parts that are androecium and gynoecium. Androecium produce male gametes and gynoecium produce female gametes.
Q8. Which of the followings are called dual gland?
Answer : Option A
Explaination / Solution:
Testis and ovary are called as dual gland as they perform two functions. They release gametes and also secretes hormone.
Q9. Which is the cofactor for the proteolytic enzyme carboxypeptidase?
Answer : Option D
Explaination / Solution:
zinc is a cofactor for the proteolytic enzyme carboxypeptidase and forms coordination bonds with the side chains of two histidines and one glutamic acid residue at the active site. A fourth bond is formed between zinc and the a-carboxyl group of the substrate amino acids, and it is here that the cleavage of the peptide occurs.
Q10. Blood plasma proteins :
i. decrease in their level causes excessive absorption of water from tissues into blood.
ii. they maintain osmotic pressure.
i. decrease in their level causes excessive absorption of water from tissues into blood.
ii. they maintain osmotic pressure.
Answer : Option B
Explaination / Solution:
Fibrinogen, globulins and albumins are the major proteins. The albumins help in osmotic balance.
