Which one of the following never occurs during mitotic cell division?
(A)Coiling and condensation of the chromatids
(B)Spindle fibres attach to kinetochores of chromosomes
(C)Movement of centrioles towards opposite poles

(D)Pairing of homologous chromosomes

Which one of the following statements cannot be connected to Predation?
(A)It is necessitated by nature to maintain the ecological balance
(B)It helps in maintaining species diversity in a community
(C)It might lead to extinction of a species

(D)Both the interacting species are negatively impacted

Which one of the following plants does not show plasticity ?

(A)Maize
(B)Cotton
(C)Coriander
(D)Buttercup

The flowers are Zygomorphic in: (a) Mustard (b) Gulmohar (c) Cassia (d) Datura (e) Chilly Choose the correct answer from the options given below.
(A)
(c),
(d),
(e) Only
(B)
(a),
(b),
(c) Only

(C)
(b),
(c) Only
(D)
(d),
(e) Only

Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis? It involves :
(A)Reduction of NADP to `` NADPH _{2} `` on the stroma side of the membrane
(B)Breakdown of proton gradient

(C)Breakdown of electron gradient
(D)Movement of protons across the membrane to the stroma

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Polymerase chain reaction is used in DNA amplification Reason (R): The ampicillin resistant gene is used as a selectable marker to check transformation In the light of the above statements, choose the correct answer from the options given below :
(A)(A) is not correct but (R) is correct
(B)Both (A) and (R) are correct and (R) is the correct explanation of (A)

(C)Both (A) and (R) are correct but (R) is not the correct explanation of `` ( A ) ``
(D)(A) is correct but (R) is not correct

Habitat loss and fragmentation, over exploitation, alien species invasion and co-extinction are causes for:
(A)Natality
(B)Population explosion
(C)Competition

(D)Biodiversity loss

Given below are two statements: Statement I : The primary `` CO _{2} `` acceptor in `` C _{4} `` plants is phosphoenolpyruvate and is found in the mesophyll cells. Statement II : Mesophyll cells of `` C _{4} `` plants lack RuBisCo enzyme. In the light of the above statements, choose the correct answer from the options given below :

(A)Statement I is incorrect but Statement II is correct
(B)Both Statement I and Statement II are correct
(C)Both Statement I and Statement II are incorrect
(D)Statement I is correct but Statement II is incorrect

Identify the incorrect statement related to Pollination:

(A)Moths and butterflies are the most dominant pollinating agents among insects
(B)Pollination by water is quite rare in flowering plants
(C)Pollination by wind is more common amongst abiotic pollination
(D)Flowers produce foul odours to attract flies and beetles to get pollinated

Hydrocolloid carrageen is obtained from :
(A)Phaeophyceae only
(B)Chlorophyceae and Phaeophyceae
(C)Phaeophyceae and Rhodophyceae

(D)Rhodophyceae only

The appearance of recombination nodules on homologous chromosomes during meiosis characterizes :
(A)Terminalization
(B)Synaptonemal complex
(C)Bivalent

(D)Sites at which crossing over occurs

Which one of the following statement is not true regarding gel electrophoresis technique?
(A)Bright orange coloured bands of DNA can be observed in the gel when exposed to UV light.
(B)The process of extraction of separated DNA strands from gel is called elution.
(C)The separated DNA fragments are stained by using ethidium bromide.

(D)The presence of chromogenic substrate gives blue coloured DNA bands on the gel.

The gaseous plant growth regulator is used in plants to :
(A)kill dicotyledonous weeds in the fields
(B)speed up the malting process

(C)promote root growth and roothair formation to increase the absorption surface
(D)help overcome apical dominance

Read the following statements about the vascular bundles: (a) In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii. (b) Conjoint closed vascular bundles do not possess cambium (c) In open vascular bundles, cambium is present in between xylem and phloem (d) The vascular bundles of dicotyledonous stem possess endarch protoxylem (e) In monocotyledonous root, usually there are more than six xylem bundles present Choose the correct answer from the options given below:
(A)
(a),
(c),
(d) and
(e) Only
(B)
(a),
(b) and
(d) Only
(C)
(b),
(c),
(d) and
(e) Only

(D)none