- Assertion: movement of materials inside phloem is
bidirectional i.e., it can be both upwards or downwards.
Reason: movement of molecules inside xylem is
unidirectional i.e., always upwards.
- Assertion: Protons produced by photolysis of water
accumulate in the lumen of thylakoids.
Reason: Photolysis of water takes place on inner surface
of thylakoid membrane.
- Assertion: Plant growth, as a whole, is indefinite.
Reason: Plants retain the capacity of continuous growth
throughout their life.
- Assertion: Excess mn in soil, can adversely decrease
mg, Fe and cu concentrations in the soil.
Reason: mn increases rate of photosynthesis, thereby
increasing absorption of mg, Fe and ca from soil.
- Assertion: On plotting increase in length of the root
against time, a linear curve is obtained.
Reason: an elongating root exemplifies arithmetic growth.
- Assertion: The photosynthetic efficiency of c 4 plant is
more than those of c 3 plant.
Reason: c 4 plants are more efficient in picking cO 2.
- Assertion: Glucose is the favoured respiratory substrate.
Reason: When glucose is used as respiratory substrate.
It is completely oxidised and rQ is 1.
- Assertion: Deficiency symptoms of N, K and mg are
first visible in the senescent leaves.
Reason: Biomolecules containing these elements are
broken down in the older leaves, making these elements,
available for mobilising to younger leaves.
- Assertion: Photorespiration interferes with the
successful functioning of calvin cycle.
Reason: Photorespiration oxidises ribulose-1, 5
biphosphate which is an acceptor of cO2 in calvin cycle.
- how many of the following statements are false?
(j) Smallest unit of ecological hierarchy is population.
(k) Term ecology was coined by Ernest haeckel.
(l) climate is a property of the atmosphere, in which
changes occur from time to time over short period.
It determines flora and fauna of a place.
(m) The most ecologically relevant environment factor
affecting biota is water.
(n) Eel is a euryhaline organism.
(a) 5 (b) 4
(c) 3 (d) 2
92. how many are stenothermal from the given organisms?
Scoliodon, Polar bear, coconut, Sunflower, Toad, Lizard,
Neophron, apes and crocodile
(a) 2 (b) 3 (c) 4 (d) 5
93. Which of the following statements are true except?
(a) Stage of suspended development is called diapause.
(b) Smaller mammals and bird species are never found
at polar region due to, their high surface to volume
ratio.
(c) Phenotypic variants of species due to change in
environment is called ecotypes.
(d) mammals of cold climate generally have short snout,
ears and limbs to minimise heat loss.
94. From the given graph of population growth select the
correct option having correct value of ‘r’.
(a) r = +ve
(b) r = 0
(c) r = -ve
(d) r = 0
- In an area, there are 200 Parthenium herbs and a single
huge banyan tree. Which of the conclusion(s) is/are
correct?
I. Population density of banyan is low.
II. Population cover area of banyan is high.
III. In above case the percentage of cover of biomass is
more meaningful than population size.
(a) Only I (b) I and II
(c) II and III (d) all of these
- carrying capacity refers to
(a) Inherent capacity of the population to reproduce
under existing ideal conditions
(b) capacity of individuals to fit among the natural
environment
(c) capacity of population to reproduce and
competitiveness
(d) capacity of resource base to support maximum
number of individuals.
- Which of the following ‘standard symbols of ecology’ is
wrongly match?
(a) KN
K
− = environmental resistance
(b) K = carrying capacity
