Three of the following statements regarding cell organelles are correct while one is wrong. Which one is wrong?
Lysosomes are double membraned vesicles budded offfrom Golgi apparatus and contain digestive enzymes.
Endoplasmic reticulum consists ofa network of membranous tubules and helps in transport, synthesis and secretion
Leucoplasts are bound by two membranes, lack pigment but contain their own DNA and protein synthesizing machinery
Sphaerosomes are single membrane bound and are associated with synthesis and storage of lipids
Which one of the following statements regarding enzyme inhibition is correct?
Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein.
Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
Non-competitive inhibition ofan enzyme can be overcome by adding large amount of substrate
None of these
Which one of the following groups of structures/ organs have similar function?
Typhlosole in earthworm, intestinal villi in rat and contractile vacuole in Amoeba.
Nephridia in earthworm, Malpighian tubules in cockroach and urinary tubules in rat
Antennae of cockroach, tympanum of frog and clitellum of earthworm
Incisors of rat, gizzard (proventriculus) cockroach and tube feet of starfish
Given diagram shows bone of the left human hindlimb as seen from front. It has certain mistakes in labeling. Two of the wrongly labelled bones are
tibia and tarsals
femur and fibula
fibula and phalanges
tarsals and femur
C.
fibula and phalanges
In the above figure, two parts of hindlimb that are wrongly marked are fibula and phalanges.
Electroporation procedure involves
fast passage of food through sieve pores in phloem elements with the help of electric stimulation
opening of stomata! pores during night by artificial light
making transient pores in the cell membrane to introduce gene constructs
purification of saline water with the help of a membrane system
In an experiment freshly hatched larvae of an insect (Khapra beetle) were reared on a basal diet (complete diet without cholesterol) with increasing amounts of cholesterol. Results obtained are shown in the graph given in the table :
The graph indicates that
cholesterol is an essential dietary requirement of khapra beetle
growth of khapra beetle is directly proportional to cholesterol concentration
cholesterol concentration of 2 µg/g diet is the optimum level
growth of khapra beetle is inhibited when cholesterol concentration exceeds 5 g/g diet
Which one of the following is correct matching of a plant, its habit and the forest type where it normally occurs?
Prosopis, tree, scrub
Saccharum, grass, forest
Shorea robusta, herb, tropical rain forest
Acacia catechu, tree, coniferous forest
Gibberellins can promote seed germination because of their influence on
rate of cell division
production of hydrolyzing enzymes
synthesis of abscisic acid
absorption of water through hard seed coat
Which one of the following features is common in silverfish, scorpion, dragonfly and prawn?
Two pairs of legs and segmented body
Living chitinous cuticle and two pairs of antennae
Jointed appendages and chitinous exoskeleton
Closed blood carcular system
Assertion : Senescence is the time when age associated defects are manifested.
Reason : Certain genes may be undergoing sequential switching on and off during one's life.
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false