Consider the following two statements:
I. In the single-celled organisms, we are not very clear about the usage of the two terms – growth and reproduction.
II. When it comes to unicellular organisms like bacteria, unicellular algae or amoeba, reproduction is synonymous with growth, i.e., increase in number of cells.
(1) Both I and II are true and II explains I
(2) Both I and II are true but II does not explain I
(3) I is true but II is false
(4) Both I and II are false
What is meant by the "species problem"?
(1) The exact definition of species is still controversial.
(2) The exact mechanisms of speciation is not known.
(3) The number of species present is much more than identified species.
(4) The extinction of species is taking place at an alarming rate.
Study the four statements (I-IV) given below and select the two correct ones out of them:
I. Definition of biological species was given by Ernst Mayr.
II. Photoperiod does not affect reproduction in plants.
III. Binomial nomenclature system was given by RH Whittaker.
IV. In unicellular organisms, reproduction is synonymous with growth.
The two correct statements are
(1) II and III
(2) III and IV
(3) I and IV
(4) I and II
Find out the wrong statement -
a. Increase in mass and increase in number of individuals are twin characteristics of growth.
b. Growth, reproduction and ability to respond are the only unique features of living organisms.
c. a and b both
d. Metabolism, ability to self-replicate and self-organise are the unique features of living organisms.
In------------- of higher animals and plants-------- and ------- are mutually------ events.
a. All, cell division, replacement, dependent
b. Majority , growth, reproduction, exclusive
c. All, growth, cell division, dependent
d. Majority ,cell division, replacement, exclusive
What is correct with respect to Growth?
a. Increase in body mass is not a criterion for growth.
b. Increase in body mass is not observed in non-living things.
c. Accumulation or increase in mass from inside is the basis of growth in living beings.
d. Growth is considered as defining property of living beings.
Growth is not considered as a defining property of living beings because
a. It is difficult to observe or measure.
b. Not a single criterion for the measurement of growth.
c. Also observed in non-living
d. Cannot be tracked as growth is from inside
Growth is a characteristic of----------.
a. Living systems
b. Living organisms
c. Non-living organisms
d. Both b and c
How many of the following will show the growth or increase in mass?
Mountain, Boulders, sand mound, Dead organism, plants.
Select the correct combination:
a. Plants: limited cell division
b. Animals: Cell division throughout life span in all type of cells.
c. Unicellular organisms: Growth observation by microscope
d. Living organisms: external growth