Solve
Guides
0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Standard IX
Biology
Nemotoda
Question

Assertion : Nematodes and tunicates show auxetic growth.
Reason : In these animals, growth occurs only by increases in size of cells and not number of cells.
  1. Both Assertion and Reason are true and Reason is a correct explanation of Assertion
  2. Both Assertion and Reason are true but Reason is not a correct explanation of Assertion
  3. Assertion is true but Reason is false
  4. Both Assertion and Reason are false
  5. Assertion is false but reason is true.

A
Both Assertion and Reason are true but Reason is not a correct explanation of Assertion
B
Both Assertion and Reason are true and Reason is a correct explanation of Assertion
C
Assertion is true but Reason is false
D
Both Assertion and Reason are false
E
Assertion is false but reason is true.
Open in App
Solution
Verified by Toppr

In the Auxetic category of growth, the volume of the body increases due to the growth of body cells in their size without any change in the number of cells. It involves only cell growth and no cell reproduction. It is a rare type of growth and is found in a few nematodes (Ascaris), rotifers, tunicates (Herdmania) etc.
So the correct option is A.

Was this answer helpful?
0
Similar Questions
Q1
(i)
Assertion: A circle is not a rectilinear figure.
Reason: A figure formed by straight lines only is called a rectilinear figure.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.
(ii)
Assertion: All right angles are equal to one another.
Reason: A unique line passes through a single point.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.
View Solution
Q2
Assertion: A circle is a rectilinear figure.
Reason: A figure formed of line segments only is called a rectilinear figure.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.
View Solution
Q3
Assertion : Amount of cyanocobalamine required daily is 3 mcg
Reason : Its deficiency causes pernicious anaemia
View Solution
Q4
Assertion: C4 – photosynthetic pathway is more efficient than C3 pathway Reason: Photorespiration is suppressed in C4 plants
View Solution
Q5
Assertion: A cyclic parallelogram is a square.
Reason: Diameter is the largest chord in a circle.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.
View Solution