Biology - Online Test
Q1. The mass of tissue seen in the left corner of the right atrium close to the atri-ventricular septum is
Answer : Option D
Explaination / Solution:
Atrioventricular Node or AV node is compact half oval mass of myogenic fibres which lies in the posterior septal wall of right atrium near the opening of coronary sinus. It receives impulse from SA node and transmits it to ventricles.
Q2. Which of the following is a gram-negative bacterium?
Answer : Option C
Explaination / Solution:
The bacterium that do not retain the Gram stain are called gram negative bacteria.
Escherichia coli ( commonly abbreviated E. coli) is a Gram-negative gammaproteobacterium commonly found in the lower intestine of warm-blooded organisms
Q3. Electron transport system take place in
Answer : Option B
Explaination / Solution:
The metabolic pathway through which the electron passes from one carrier to another, is called the ETS and it is present in the inner mitochondrial membrane.
Q4. Using the same land for farming, forestry as well as animal husbandry will be called
Answer : Option A
Explaination / Solution:
Agroforestry is the using of same land for farming, forestry as well as animal husbandry in integrated manner. The byproduct of one process in used in another process.
Q5. A scar on the seed coat through which the developing seeds were attached to the fruit is called
Answer : Option C
Explaination / Solution:
The hilum is a scar on the seed coat through which the developing seeds were attached to the fruit.
Q6. Which of the following phases in mitosis is in correct order?
Answer : Option D
Explaination / Solution:
- Mitosis. A four-stage process that creates two identical cells from one original cell.
- Prophase. The first and longest stage of mitosis. ...
- Metaphase. The second stage of mitosis. ...
- Anaphase. The third stage of mitosis. ...
- Telophase. The fourth and last stage of mitosis.
Q7. E. coli carry resistance to
Answer : Option A
Explaination / Solution:
Bacterium E.coli carries resistance to antibiotic Fluroquitnolone due to presence of plasmid having extra nuclear DNA.
Q8.
Read the following statements about urine formation :
i. ultrafiltration doesn’t need any energy expenditure by kidney cells.
ii. selective reabsorption of glucose, water, urea, hormones, amino acids etc takes place through passive transport.
iii. PCT cells have many microvilli along with few mitochondria since most of nutrients are absorbed passively.
Answer : Option A
Explaination / Solution:
During urine formation, ultra filtration takes place in which energy is not required by cells of kidney. Selective reabsorption of glucose , water, salt etc. occurs actively and proximal convoluted tubules (PCT) do not have microvilli.
Q9. According to De Vries theory, evolution is
Answer : Option A
Explaination / Solution:
According to De Vries theory of evolution, the evolution is jerky and discontinuous as the variation due to mutation do not occurs continually. Mutation is sudden change in gene of organism.
Q10. Which part of epidermis of leaf contains less stomata?
Answer : Option A
Explaination / Solution:
There are a number of differences between abaxial and adaxial stomata. First, stomatal density is usually higher on the abaxial surface than it is on the adaxial surface of leaves
