(b) Hydrilla and Potamogeton occur in stage A,
Phragmites and Typha occur in stage C.
(c) Acer and Quercus occur in stage F and
Nymphaea and Pistia occur in stage B.
(d) All the above
- Protein synthesis in an animal cell occurs
(a) Only on the ribosomes present in cytosol
(b) On ribosomes present in cytoplasm as well as
in mitochondria
(c) Only on ribosomes attached to the nuclear
envelope and endoplasmic reticulum
(d) On ribosomes present in the nucleolus as
well as in cytoplasm - Which one of the following techniques made
it possible to genetically engineered living
organisms?
(a) Recombinant DNA Techniques
(b) X-ray diffraction
(c) Hybridisation
(d) Heavier isotope labeling - Match the column I & II and select the correct
option
Column I Column II
A. Primary meristem 1. Protects the stem
B. Lateral meristem 2. Increase in length
C. Cork cambium 3. Protects root cap
D. Root cap 4. Increase in girth
(a) A-2,B-3,C-1,D-4 (b) A-1,B-2,C-3,D-
(c) A-4,B-3,C-2,D-1 (d) A-2,B-4,C-1,D- - A water fern which is used as a green manure in
rice fields is
(a) Salvinia (b) Mucor
(c) Aspergillus (d) Azolla - What does the diagram represents?
(a) Anaphase I of meiosis
(b) Anaphase II of meiosis II
(c) Anaphase of mitosis
(d) Telophase I of meiosis II- In polar seas, aquatic a like b have a thick
layer of fat called c below their skin that acts as
d and reduces loss of body heat.
(a) a- fishes, b-sharks, c-clasper, d-conductor
(b) a-mammals, b-seals, c-blubber, d-insulator
(c) a-fishes, b-seals, c-blubber, d-insulator
(d) a- mammals, b-seals, c- blubber, d-conductor - In Bt cotton, the Bt toxin present in plant tissue
as pro-toxin is converted into active toxin due to
(a) Presence of conversion factors in insect gut
(b) Action of gut micro-organisms
(c) Acidic pH of the insect gut
(d) Alkaline pH of the insect gut. - Assertion: The leaves of cauliflower become
flaccid and brown in molybdenum deficiency
Reason: Cauliflower plant is affected by whiptail
disease in molybdenum deficiency
(a) If both Assertion and Reason are correct
and Reason is the correct explanation for
Assertion.
(b) If both Assertion and Reason are correct, but
Reason is not the correct explanation for
Assertion.
(c) If Assertion is true but Reason is false.
(d) If both Assertion and Reason are false. - The following diagram represents heterophyll in
(a) Coriander (b) Buttercup
(c) Larkspur (d) Eucalyptus- Which of the following is true for alternation of
generation?
(a) The sporophyte undergoes syngamy to
produce spore
(b) The gametophyte undergoes syngamy to
produce spore
(c) The sporophyte undergoes meiosis to
produce spore