Olympiad Science - Plants
Exam Duration: 45 Mins Total Questions : 30
Which of the following arrows show the processes that green plants go through in the day in the presence of sunlight during photosynthesis?
- (a)
P and Q only
- (b)
P and Ronly
- (c)
Q and R only
- (d)
P,Q and Ronly
The given figure represents photosynthesis. In the presence of sun-light plants take in carbondioxide and give out oxygen.
Which of the following is NOT taken by a green plant?
- (a)
Air
- (b)
Water
- (c)
Food
- (d)
Sunlight
Plants synthesise their own food.
Which of the following is classified correctly?
- (a)
Storage root Root not used for storage carrot grass - (b)
Storage root Root not used for storage Lotus tapoica - (c)
Storage root Root not used for storage potato turnip - (d)
Storage root Root not used for storage Maize sweet potato
In the given options, option A is matched correctly.
Which of the following substances are transported by the arrows shown in the given plant?
- (a)
(i) and (ii) only
- (b)
(iii)and (iv) only
- (c)
(i), (ii) and (iii) only
- (d)
(i), (ii),(iii)and (iv)
In the given figure arrows show the path taken by water and mineral salts.
What do the arrows in the figure given indicate?
- (a)
The process of transpiration
- (b)
The exchange of gases with the surroundings.
- (c)
Transportation of sugar.
- (d)
Path taken by sunlight.
The arrows in the given diagram indicate the exchange of gases with surroundings.
Which part protects the flower in bud condition?
- (a)
Sepals
- (b)
Petals
- (c)
Anther
- (d)
Stigma
Sepals are usually green in colour. It protects the flower in bud condition.
Which part of a plant is also called the stalk of a leaf?
- (a)
Sessile
- (b)
Plumule
- (c)
Stipule
- (d)
Petiole
Petiole is the stalk of a leaf.
Which of the following plants have tap root system?
- (a)
Balsam
- (b)
Grass
- (c)
Maize
- (d)
Wheat
Plants like balsam show tap root system. The main root is larger, grows vertically downwards.
Which of the following represents X, Y and Z in the figure given below?
- (a)
X Y Z Anther Filament Ovule - (b)
X Y Z Style Stigma Ovary - (c)
X Y Z Style Anther Ovary - (d)
X Y Z Filament Style Ovary
In the given figure X style,Y anther and Z-ovary.
Which characteristics is common to gourd, passion flower and grapevine?
- (a)
They are shrubs
- (b)
They are trees
- (c)
They are climbers
- (d)
They are herbs
The given plants are examples of climbers.
Which is the characteristic feature of the lamina of a leaf?
- (a)
The main vein present on the mid rib of the leaf.
- (b)
Broad expanded green part of the leaf.
- (c)
Small leaves at the base of petioles.
- (d)
Chloroplast which contains the chlorophyll pigment.
The broad green part of the leaf is called lamina.
What is the characteristic feature of reticulate venation?
- (a)
Veins form a network on the leaf.
- (b)
Veins run parallel to the midrib.
- (c)
Veins run horizontal to the midrib.
- (d)
Veins are found only on the edge of leaf.
In reticulate venation veins form a net work on the leaf.
Parallel venation is observed mostly in which of the following plants?
- (a)
Monocot plants
- (b)
Dicot plants
- (c)
Thallophytes
- (d)
Bryophytes
Parallel venation is the characteristic feature of monocots.
In which of the following processes do plants lose water in the form of water vapour through the leaves and stem?
- (a)
Transpiration
- (b)
Respiration
- (c)
Photosynthesis
- (d)
Pollination
Loss of water through leaves and stems is called transpiration.
Which of the following is the female reproductive organ in a flower?
- (a)
Sepals
- (b)
Petals
- (c)
Stamens
- (d)
Carpels
Ovary or carpel is the female reproductive organ in a flower.
Which of the following is the function of brightly coloured petals?
- (a)
To reflect more sunlight.
- (b)
To prepare more food.
- (c)
To attract insects.
- (d)
There is no specific reason.
Petals are brightly coloured to attract insects.
What is the reason behind the stigma being sticky?
- (a)
To produce more gum.
- (b)
To stick the ovules together.
- (c)
To trap pollen grains.
- (d)
There is no specific function.
Stigma is sticky to traps pollen grains.
Which of the following represents 'X' in the given statement?
- (a)
Flower
- (b)
Roots
- (c)
Stem
- (d)
Leaf
In the given question X represents stem.
Identify 'x' in the given figure.
- (a)
Reduced stem
- (b)
Reduced leaf
- (c)
Reduced tendril
- (d)
Reduced stipules
In the given cactus plant, leaves are modified into spines.
Which ofthe following plants would have a root structure similar to one shown in the figure given below?
- (a)
Marigold
- (b)
Mango
- (c)
Paddy
- (d)
Balsam
Given figure is of fibrous root. Many small roots arise from the point where the stem touches the ground.
The symbols given below are used by lasya to group plants.
Symbol is used to group.
- (a)
Guava
- (b)
Beans
- (c)
Pumpkin
- (d)
Carrot
Carrot is a biennial. The plants which complete their life cycle in two years are called biennials. They grow vegetatively in I year and they flower and produce seeds in II year.
Mrs Negi took a leaf in a test-tube and added alcohol (spirit) to it. She 1 took a beaker half-filled with water and put the test-tube in it. The setup was then heated. The leaf was removed and washed in water.
After the heating of leaf in alcohol is over, the leaf becomes
- (a)
blue
- (b)
black.
- (c)
remains green.
- (d)
colourless
The green colour is lost during heating of the test-tube containing leaf and alcohol
Mrs Negi took a leaf in a test-tube and added alcohol (spirit) to it. She 1 took a beaker half-filled with water and put the test-tube in it. The setup was then heated. The leaf was removed and washed in water.
If an iodine solution is poured on the leaf then the leaf will turn
- (a)
yellow.
- (b)
black.
- (c)
blue.
- (d)
blue-black
This is the typical iodine colour test for the presence of starch
Anshu took some gram seeds for the purpose of germinating them. She put the seeds on a wet cotton wool. After a few days, the seeds germinated but she was not able to pull out the seeds from the cotton wool. This is because
- (a)
seeds need warmth from the woolly bed.
- (b)
seeds are used to cotton wool now. (radicle)
- (c)
seeds get their nutrition from cotton wool.
- (d)
the new roots have tiny root hair which cling to the cotton wool
The roots have branches and these are covered with tiny root hair. The root hairs increase the surface area for absorption of water and minerals from the soil. The roots hold the plant firmly to the soil.
A potted plant was brought indoors. Some of its leaves were then covered completely with black paper and the plant shifted outdoors after two days.
If the black paper is removed and these leaves are tested for starch then
- (a)
the iodine test will be positive.
- (b)
the iodine test will be negative.
- (c)
leaves will show the absence of starch.
- (d)
both 'b' and 'c'.
These leaves will not have any starch. We first removed all the stored starch by keeping the pot indoors. Without sunlight leaves cannot photosynthesize and form starch. The iodine test is negative and no blue-black colour is formed.
Which one of these is a single/simple flower?
i) Chrysanthemum
iii) Sunflower
ii) Marigold
iv) Petunia
- (a)
i) only
- (b)
i), ii) and iii) only
- (c)
ii), iii) and iv) only
- (d)
iv) only
Petunia is a single flower whereas others are inflorescences.
The male part of the flower is
- (a)
stamen.
- (b)
anther.
- (c)
filament.
- (d)
all of these
Stamen (a whorl of stamens is called anandroecium) includes anther on top (which has pollen grains) and a long filament.
Which of these has a modified stem to store food?
- (a)
sweet potato
- (b)
carrot
- (c)
turnip
- (d)
ginger
A stem has nodes and internodes which are clearly visible on underground modified stems like potatoes (the eyes of potato are its nodes), ginger and turmeric. Each eye of potato has a bud surrounded by scaly leaves. Each bud can give rise to a new plant. Roots do not show nodes and internodes.
Pick out the incorrect statement
- (a)
Tendrils are wire-like coiled outgrowths from the stem or leaves to support the plants with a weak stem.
- (b)
Root nodules are small knob-like outgrowths on the roots of leguminous plants that help in nitrogen fixation.
- (c)
Node is the part of the stem where the leaf is attached.
- (d)
Plumule is that part of the embryo that grows into a new root.
Radicle is that part of the embryo that grows into a new root. Plumule is that part of the embryo that grows into a new shoot
Which one of the following is false?
- (a)
Glory lily and pea plants have leaves modified as tendrils.
- (b)
Grapevine, passion flower and gourd have stem modified as tendrils
- (c)
The falling of pollen grains on the stigma of the flower of the same species leading to its eventual maturation is called pollination.
- (d)
Fertilization occurs when pollen grains leaves the anther
When the male gamete present in the pollen grain fuses with the female gamete present in the ovule it is called fertilization.