CBSE 11TH BIOLOGY - Online Test
Q1. Select the correct statement.
Answer : Option A
Explaination / Solution:
The roots of extant vascular cryptogams and most monocotyledons do not show any secondary growth; they remain entirely primary throughout their life.
Q2. The basic unit of classification is
Answer : Option B
Explaination / Solution:
The basic unit of classification is species. Species are population of organisms that can inter breed among themselves to produce new organisms.
Q3. Which plant hormone is named anti-ageing hormone?
Answer : Option B
Explaination / Solution:
A unique role of cytokinins is to produce anti-aging effects on some plant parts. Cytokinins actually provide a younger, healthier look in plants. By adding this hormone to cut flowers, florists are able to slow down the aging process, providing us with prettier flowers for longer.
Q4. The following X-ray shows :
Answer : Option A
Explaination / Solution:
The X-ray of knee shows gout in the knee. Gout is a kind of arthritis. It can cause an attack of sudden burning pain, stiffness and swelling in joint.
Q5. Nissl granules in a nerve cell are now identified as
Answer : Option D
Explaination / Solution:
The nissl granules in nerve cell are now identified as ribosomes after discovery of electron microscope that provides highly magnified image for detailed study.
Q6. In fungus, food reserves is
Answer : Option D
Explaination / Solution:
In fungus, the food reserve is glycogen and fat. Different fungi contain different kinds of reserve food materials depending upon habitat and body structure of fungus.4
Q7. The excess water collected in the form of droplets around special openings of veins near tip of leaves is called as
Answer : Option B
Explaination / Solution:
The excess water collects in the form of droplets around special openings of veins near the tip of grass blades, and leaves of many herbaceous parts. Such water loss in its liquid phaseis known as guttation.
Q8. Entry of ions into cells is called
Answer : Option D
Explaination / Solution:
Entry of ions into cells is called influx. Influx takes place actively against the concentration gradient by utilization of energy through plasmodesmata of plant cells.
Q9. Every cell contains DNA and when we consume plant /animal material , the DNA which reaches our digestive tract is digested by :
Answer : Option C
Explaination / Solution:
Food material consists of plant or animal cells. Each cell contain DNA in their nucleus. Digestion of DNA takes place in small intestine by the action of enzyme succus entricus.
Q10. Gustatoreceptors are responsible for the sense of :
Answer : Option C
Explaination / Solution:
Gustatoreceptors are responsible for the sense of taste. Gustatory receptors are located inside taste buds on the tongue.
