Identify the given microorganism and select the incorrect statement regarding it.
A It is a saprophyte commonly called as black bread mould.
B It reproduces by means of spores.
C It results in the spoilage of food materials.
D It is a parasitic fungus that causes various diseases in plants, animals and humans.
A ball is thrown horizontally from a point 100 m above the ground with a speed of 20 m s-1. Which of the following statements is incorrect regarding the ball just before reaching the ground?
A Horizontal distance covered by the ball is 90.35 m.
B Time taken by the ball is 4.5 s.
C Speed of the ball is 49 m s-1
D Displacement of the ball 110√2m.
Study the given flow chart.
Identify P-S and select the incorrect statement.
A P could be unicellular organism in which locomotion takes place by means of pseudopodia.
B Q could be organism which possesses fins whereas S could be organism which possess feathers.
C R has three stage life cycle whereas S may have four stage life cycle.
D In organism S sex chromosome of male parent might determine the sex of the offspring.
Refer to the given dichotomous key and select the correct statement.
(i) (A) Single parent is involved - Go to (ii)
(B) Two parents are involved - Go to (v)
(ii) (A) New plants are produced by natural method - Go to (iii)
(B) New plants are produced by artificial method - Go to (iv)
(iii) (A) Plant produced through stem - P
(B) Plant produced through root - Q
(iv) (A) Plant produced from unorganised cell mass - R
(B) Plant produced by bending young branch towards the ground and covered with moist soil - S
(v) (A) Plant produced when pollen grains are transferred to the stigma of same flower of the same plant - T
(B) Plant produced on transferring pollen grains to the stigma of different flower - U
A P could be sweet potato while S could be Asparagus.
B R could be Asparagus which grows in suitable nutrient medium.
C T could be papaya while U could be Hibiscus.
D Q could be potato which possesses scars or depressions called eyes.
Which equation is the correct representation for the process of photosynthesis?
AO2 + Water Glucos + CO2
BCO2 + Water Glucos + O2
CCO2 + Water Starch + O2
DBoth B and C
Why can it not be starch?
Study the given changes carefully.
I. Heating a black material (tar) for repairing a road.
II. Heating a bowl containing ice.
III. Hardening of plaster of Paris on drying.
Which of the above changes cannot be reversed ?
A I and II only
B I and III only
C II and III only
D I, II and III