CBSE 11TH BIOLOGY - Online Test
Q1. Read the following statements and view carefully the figure :
i. Osteoporosis is an age-related disorder characterised by decreased bone mass. Osteoarthritis is shown in the following figure.
ii. The above figure shows gouty arthritis which is caused by inflammation of joints.
iii. Decreased levels of estrogen is a common cause for increased chances of fractures.
iv. Inflammation of joints is caused by decreased levels of calcium ions in body fluids.
i. Osteoporosis is an age-related disorder characterised by decreased bone mass. Osteoarthritis is shown in the following figure.
ii. The above figure shows gouty arthritis which is caused by inflammation of joints.
iii. Decreased levels of estrogen is a common cause for increased chances of fractures.
iv. Inflammation of joints is caused by decreased levels of calcium ions in body fluids.
Answer : Option D
Explaination / Solution:
Osteoporosis is an age-related disorder characterised by decreased bone mass. It is mainly caused by decreased level of estrogen in blood. Osteoporosis may leads to increased chances of fracture.
Q2. Intestinal mucosa has microvili to
Answer : Option C
Explaination / Solution:
The innermost layer of intestinal wall is called mucosa. Mucosa contain microvilli to increase the surface area for absorption of digested food to transport into different part of the body.
Q3. A bacterium capable of tolerating extreme heat, dryness and toxic chemicals is probably having
Answer : Option C
Explaination / Solution:
A bacterium capable of tolerating extreme heat, dryness and toxic chemicals have ability to produce endospores inside the body that help them to tide over unfavorable conditions.
Q4. A cell dipped in 0.5 M sucrose has no effect. It is dipped in 0.5 M NaCl, the cell will
Answer : Option A
Explaination / Solution:
A cell dipped in 0.5 M sucrose has no effect due to osmosis as concentration of sucrose is more of equal to cytoplasm but 0.5 M NaCl cause exosmosis that leads to plasmolysis.
Q5. Non-symbiotic nitrogen fixing prokaryote is
Answer : Option C
Explaination / Solution:
Most of the prokaryotic nitrogen fixing prokaryotes are symbiotic in nature. Azatobacter is a bacteria which is non-symbiotic nitrogen fixing prokaryote.
Q6. Select which one is correctly matched pair :
Answer : Option C
Explaination / Solution:
Some of the substances like fructose and some amino acids are absorbed with the help of the carrier ions like sodium ions. This mechanism is called the facilitated transport.
Q7. Match the following :
column A
a) Hypophysis
b) Modulator
c) Receptor
d) Effector
column B
i) Sense organs
ii) Pituitary
iii)Brain and spinal cord
iv) Muscles and glands
column A
a) Hypophysis
b) Modulator
c) Receptor
d) Effector
column B
i) Sense organs
ii) Pituitary
iii)Brain and spinal cord
iv) Muscles and glands
Answer : Option D
Explaination / Solution:
Hypophysis is a part of pituitary gland. Modulator is present in brain and spinal cord. Receptor is located in sense organs. Effectors are muscle and glands that bring about movement.
Q8.
Identify the plant shown in the figure given below.
Answer : Option D
Explaination / Solution:
The plant shown above is cycas. This plant belongs to division Cycadophyta and family Cycadaceae. It is dioecious and Cycas circinalis species is endemic to India.
Q9. Chlorophyll is located inside
Answer : Option D
Explaination / Solution:
The chloroplast consists of a number of organised flattened membranous sacs called the thylakoids,Chlorophyll pigments are present in the thylakoids.
Q10. Which of the following stages of calvin cycle are in correct order?
Answer : Option B
Explaination / Solution:
The Calvin cycle can be described under three stages: carboxylation, reduction and regeneration.Pathway operated in cyclic manner.
