CBSE 11TH BIOLOGY - Online Test
Q1.
Read the following about joint replacement therapy :
i. Artificial joints are made from the similar material that makes our bones.
ii. Metal or plastic is used to prepare an artificial joint.
iii. Following figure shows a disfunctional joint in the knee.
iv. Above figure shows an artificial joint in the knee.
Answer : Option D
Explaination / Solution:
Artificial joints are made up of metal and plastic. The figure shown above shows artificial joint in the knee.
Q2. Which layer produces new cell by mitosis?
Answer : Option C
Explaination / Solution:
Stratum Malpighi is the basal layer of skin epidermis having basal layer and generative layer that produces new cells by mitosis.
Q3. Sexual reproduction is by copulation of male and female followed by embryological development is characteristic feature of
Answer : Option D
Explaination / Solution:
The sexual reproduction in kingdom Animalia is by copulation of male and female followed by embryological development.
Q4. During symplastic movements, the water travels through
Answer : Option B
Explaination / Solution:
During symplastic movement, the watertravels through the cells – their cytoplasm; intercellular movement isthrough the plasmodesmata. Water has to enter the cells through the cell membrane; hence the movement is relatively slower.
Q5. Sulphur is important nutrient for optimum growth and productivity of
Answer : Option A
Explaination / Solution:
Sulphur is an important nutrient for optimum growth and productivity of pulse crops, because sulphur is important in protein synthesis of plants.
Q6.
Trans fats :
i. they are found in most processed and fast foods for eg. French fries.
ii. they help food stay fresh for long time.
iii. they are much better type of fat than the saturated fats.
Answer : Option A
Explaination / Solution:
Trans fats are hydrogenated fats which makes the oil more solid. They are found in most processed and fast foods. They help food stay fresh for long time.
Q7. Read the following :
i. In human iris, contraction of sphincter muscles widens the pupil in dim light to let in more light.
ii. The amount of pigment in the ciliary body of eye provides eye with its characteristic colour.
i. In human iris, contraction of sphincter muscles widens the pupil in dim light to let in more light.
ii. The amount of pigment in the ciliary body of eye provides eye with its characteristic colour.
Answer : Option C
Explaination / Solution:
Human eyes contain iris that is responsible for changing size of pupil to allow or preventthe amount of light entering the eyeball. Cons cells present in retina are responsible for colour perception.
Q8. The cone of Gymnosperms represent the
Answer : Option C
Explaination / Solution:
In gymnosperms, male and female cones are formed that produce male and female gametes.The strobili bearing microsporophylls and microsporangia are called microsporangiate or male strobili. The cones bearing megasporophylls with ovules or megasporangia are called macrosporangiate or female strobili. So, cone of gymnosperms represents the reproductive organs.
Q9. The chromatin contains some basic proteins are called as
Answer : Option A
Explaination / Solution:
Histone proteins are the basic packer and arranger of chromatin.
Q10. Light reaction otherwise called as
Answer : Option D
Explaination / Solution:
Light reactions or the ‘Photochemical’ phase include light absorption, water splitting, oxygen release, and the formation of high-energy chemical intermediates, ATP and NADPH. Several complexes are involved in the process.
