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Sohan has three identical roses of different colours; red, yellow and pink. He shines a torch on the three roses one-by-one and gets a shadow on the wall in each case. Richa who is observing the shadows formed on the wall can

ADistinguish shadow of the red rose only
BDistinguish shadows of the red and yellow roses only
CDistinguish shadows of all the three roses
DNever distinguish the shadows of the three roses.

Study the given diagrams showing the cross-section of two flowers. Which of the following statements is/are correct regarding them?

(i) Both flowers will produce female gametes.
(ii) Flower X is a bisexual flower and flower Y is a male flower.
(iii) Self pollination can take place in flower Y only.

A(i) only
B(iii) only
C(i) and (ii)
DNone of these

On a cold day, it is hard to open the metallic lid of a tight glass container. But when you gently heat the neck you can easily open the lid. Why?

AOn heating, glass expands and lid contracts.
BOn heating, lid expands more than the neck and thus slides easily.
CNeck becomes slippery on heating.
DLid of the bottle cannot bear the heat.

Read the given passage and answer the following questions.
Siddhi studied forelimbs of three organisms and described them as follows :
Organism X – Long and short bones, covered with muscles, used for running.
Organism Y – Long and short bones, covered with feathers used for flying.
Organism Z – A layer of a complex chemical with supporting framework which is not made of bones and used for flying.
Select the option that shows correct relationship between these organisms.

A
B
C
D

Which graph shows the effect of temperature on the rate of photosynthesis of the aquatic plants such as Elodea?

A
B
C
D

Three salt solutions are given as:
X : Potassium sulphate solution
Y : Sodium carbonate solution
Z : Ammonium sulphate solution
Which of the following statements is incorrect regarding these salt solutions?

AX will have same effect on red litmus paper as the common salt solution.
BY will have same effect on turmeric paper as the milk of magnesia.
CAmmonium sulphate will have same effect on blue litmus paper as the lemon juice.
DNone of these

Select the tool that measures in the unit of kilogram.

A
B
C
D

Match the columns and select the correct option.

Refer to the given Venn diagram and select the incorrect statement regarding X, Y and Z.


A X could be an incurable disease that damages immune system of the infected person.
B Disease Y could be effectively treated by antibiotics.
C Z could be a disease in which blood platelet count of a person goes down significantly.
D Both X and Y could be communicable diseases, of which Y could get cured on its own.