Transportation In Animals And Plants(7th Grade > Biology ) Questions and answers for exam Preparation

7th Grade > Biology

TRANSPORTATION IN ANIMALS AND PLANTS MCQs

Total Questions : 111 | Page 6 of 12 pages

Question 51. What will happen if there is a decrease in platelet count in the blood?

Blood will not clot
Blood will clot very quickly
We will become more immune
We will become more susceptible to germs

Discuss Question

Answer: Option A. -> Blood will not clot
:
A
The plateletsform a meshwork and release blood clotting chemicals at the site of injury and prevent further bleeding.If there is a decrease in platelet count in the blood, then the blood will not be able to clot.

Question 52.

Which part of the excretory system stores the urine before excretion?

Ureters
Kidney
Bladder
Urethra

Discuss Question

Answer: Option C. -> Bladder
:
C

The urinary bladder is an organ that collects and stores urine formed in the kidneys. Ureter is the duct through which urine passes from the kidney to the bladder. Urine is excreted through the urethra.

Question 53.

Which of the following are characteristics of veins?

Carry oxygen rich blood
Thin walled
They have valves
Carry carbon dioxide rich blood

Discuss Question

Answer: Option C. -> They have valves
:
B, C, and D
Veins are blood vessels that carry carbon dioxide rich blood from all parts of the body back to the heart. The veins have thin walls. There are valves present in the veins that allows blood to flow only in one direction, towards the heart.

Question 54.

Which of the following blood vessels carry blood rich in carbon dioxide?

Arteries
Veins
Pulmonary artery
Pulmonary vein

Discuss Question

Answer: Option B. -> Veins
:
B and C
A vein is a blood vessel that transports blood from all parts of the body to the heart. They carry deoxygenated blood back from the body to the heart. Pulmonary artey carries blood which is rich in carbon dioxide from the right ventricle of the heart to the lungs for oxygenation.

Question 55.

Which of the following is/are vascular tissues?

Phloem
Xylem
Meristem
Stomata

Discuss Question

Answer: Option A. -> Phloem
:
A and B

Xylem and the phloem are the vascular or conducting tissues found in plants. Xylem transports water and dissolved minerals from the root to all parts of the plant. Phloem tranports the products of photosynthesis from leaves to all parts of the plant.

Question 56.

Which of the following blood vessel carries carbon dioxide rich blood from heart to the lungs?

Aorta
Pulmonary artery
Pulmonary vein
Capillaries

Discuss Question

Answer: Option B. -> Pulmonary artery
:
B
Arteries transport oxygen rich blood to all parts of the body from the heart. Veins transport carbon dioxide rich blood to the heart from all parts of the body.
Pulmonary artery is the only artery that carries carbon dioxide rich blood to lungs for re-oxygenation. Since pulmonary artery carries blood away from the heart, it is called artery and not a vein.

Question 57.

Blood transports digested food from the small intestine to other parts of the body

True
False
Left atrium
Left ventricle

Discuss Question

Answer: Option A. -> True
:
A
Absorption of food occurs in the small intestine. The inner lining of small intestine has a large number of finger-like projections called villi. These villi provide a large surface area for absorption of food. The villi are richly supplied with blood vessels. The blood in the blood vessels absorbs the digested food from the small intestine and transports it other parts of the body.

Question 58.

Which chamber of the heart pumps the oxygenated blood into the body parts?

Right atrium
Left atrium
Right ventricle
Left ventricle

Discuss Question

Answer: Option D. -> Left ventricle
:
D
Heart has four chambers- two upper atria and two lower ventricles. The right atrium receives deoxygenated blood from the body and pumps it to the right ventricle. The right ventricle pumps this deoxygenated blood into the lungs. Left atrium receives the oxygenated blood from the lungs and pumps it to the left ventricle, from where it is circulated to all parts of the body, through aorta.

Question 59.

Birds excrete a semi-solid, white coloured substance consisting of _________.

bile
ammonia
urea
uric acid

Discuss Question

Answer: Option D. -> uric acid
:
D
Nitrogenous wastes in birds is excreted as a semi-solid, white coloured substance composed of uric acid.
The excretory product in humans is urea. The excretory product in fishes is ammonia.

Question 60.

Which chamber of the heart pumps blood to the lungs for oxygenation?

Right atrium
Right ventricle
Left atrium
Left ventricle

Discuss Question

Answer: Option B. -> Right ventricle
:
B
The heart has 4 chambers - two atria and two ventricles. The right atrium receives deoxygenated blood from the body and pumps it to the right ventricle. The right ventricle pumps the oxygen deficient blood to the lungs for oxygenation.