Science MCQ (1 Marks)

Humans have two kidneys in them.

Small pores in leaves of plants are stomata.

The muscular tube known as Urethra is a long tube which connects the urinary bladder to the urinary meatus for removal of urine from the body.

The pulmonary veins are the veins that transfer oxygenated blood from the lungs to the heart.
This differentiates the pulmonary veins from other veins in the body, which carry deoxygenated blood from the rest of the body back to the heart.

Oxygen.

Hydra.

Chlorophyll is the green pigment present in leaves of plants that absorbs sunlight energy, to carry out photosynthesis.
In the absence of chlorophyll, the leaves would not be able to capture sunlight energy.
Therefore, no photosynthesis can occur.

Haemoglobin.

Phloem is the tissue in plants that transport food to the parts of the plant where it needs to go.
Phloem is composed of various specialized cells called sieve tubes, companion cells, phloem fibres, and phloem parenchyma cells.

Stethoscope.

Towards the heart.

Stethoscope, medical instrument used in listening to sounds produced within the body, chiefly in the heart or lungs.

Heart.

Excretion.

Xylem.

Kidney.

Urine is formed in the kidneys through the filtration of blood and from the kidney, the ureter transports urine into the urinary bladder.
The urinary bladder is a muscular sac.
When it is empty, it is about the size and shape of a pear.
It acts as a temporary reservoir for urine.

Cappillaries are the thinnest blood vessels.

Through walls of capillaries many substances can be exchanged.

Food is carried from the leaves by pipes formed by pholem tissue.

In humans, the heart is present in the chest region.
It is located between the lungs and above the diaphragm.
The heart is slightly tilted towards the left side and thus, a stronger heartbeat can be felt on the left side.
Hence the doctor will keep the stethoscope for hearing Raman's heartbeat on the left side of his chest.

Plants synthesise their food with the help of chlorophyll.
It helps to capture the energy of Sunlight.
Plants get raw materials form surroundings.
So, we find that sunlight, chlorophyll, carbon dioxide and water are necessary components to carry out the process of photosynthesis.
And carbohydrates produced and ultimately converted into starch.
During this process oxygen is released which is very essential for the survival all living organisms.

Heartbeat is rhythmic contraction and relaxation of heart muscles is called a heartbeat.
Heart rate is the speed of the heartbeat measured by a number of contraction of the heart per minute.

Oxygen and food are two substances that are transported by blood.

The water evaporates through the stomata present on the surface of leaves by the process called transpiration.

Insects excrete uric acid in form of solids.

Yes, because the chlorophyll needed for photosynthesis is hiding within the leaf colour.
Plant leaves contain chlorophyll as “Carotenoids” and “Anthocyanins”.
These assist chlorophyll in the process of photosynthesis.

A normal pulse is regular and strong.
Heart rates, and therefore pulse rates (number of beats per minute) change with age and can vary between individuals of the same age.

Salts present in the sweat.

Generally, leaves have a green pigment called chlorophyll which absorb the sunlight and makes food for the plant by the process of photosynthesis.

Generally, leguminous plant such as gram, pulses.
These plants have root nodules in them which have a symbiotic association with rhizobium bacteria.
It converts nitrogen gases as compounds.
In return, the plants provide food and shelter to the bacteria.
Hence, farmers do not need to apply nitrogenous fertilizers in the field during cultivation.

Xylem.

The bodies of living organisms are made of tiny units called “cells”.
Cells can be seen only under the microscope.
Some organisms are made of only one cell.
The cell is enclosed by a thin outer boundary, called the “cell membrane”.

White blood cells.

It causes cooling.

Chlorophyll, sunlight, carbon dioxide and water are necessary to carry out the process of photosynthesis.
During the process oxygen is released.
The carbohydrates ultimately get converted into starch.
The presence of starch in leaves indicates the occurrence of photosynthesis.
The starch is also a carbohydrate.

Chest cavity.

Ammonia.

When an injury causes a blood vessel wall to rupture, platelets then rush to the site of damage and get activated.
They form a plug (clot) to fix the damage.
The process of spreading across the surface of a damaged blood vessel to stop bleeding is called adhesion.
This is because when platelets get to the site of the injury, they grow sticky tentacles that help them stick (adhere) to one another.

Roots absorb water and minerals from the soil continuously.
Evaporation of water from leaves creates a suction force which causes the water to move upwards.