A scientist observed a sudden increase in the number of algae in a lake over a few days. The reason behind it could be that ____________.
A Water cycle in the area got unbalanced
B Electronic wastes were being dumped in a nearby area
C A factory with heavy smoke discharge has been established nearby
D Heavy amount of chemical fertilisers were being used in a nearby field
dddddddddddddddddddddddddddddddddddddddd is the ans
Which of the following is the most effective way to measure the effect of different carbon dioxide concentrations on the rate of photosynthesis?
APlacing same amount of dry ice in similar bell jars kept in sunlight containing different plants.
BUsing different concentrations of sodium hydrogen carbonate solution with same type of immersed water plants in similar bell jars placed in sunlight.
CVarying light intensity given to different well watered plants placed in similar bell jars kept in sunlight.
DVarying amount of air provided to different well watered plants placed in similar bell jars kept in sunlight.
Rahul took a container of 1500 cm3 volume and pumped 500 cm3 air into it. Now, the volume of air in the container is __________.
A 1500 cm3
B 500 cm3
C 2000 cm3
D Cannot say
Refer the given labelled diagram of digestive system and answer the questions that follow.
1. In which of the labelled parts the digestion of the food is completed?
2. Which of these labelled parts send some digestive juices into the small intestine?
3. The blood vessels in which of these labelled parts absorb the extra water?
(a) (1) e (2) e and f (3) h
(b) (1) h (2) d and f (3) g
(c) (1) g (2) d and h (3) e
(d) (1) g (2) e and f (3) d
Can you tell the answer to this question
Sahil shone a torch and blew a horn at the same time, while standing at 15 m distance from Amit. Amit will __________.
A First hear the sound then see the light
B First see the light then hear the sound
C See the light and hear the sound at the same time
D None of these
has to be b