Transport RT-2

Lenticels and hydathodes are small pores with following common attributes…

• Their opening and closing are not regulated

• They allow exchange of gases

• They always remain closed

• They are found on the same organ of plants

Na+, K+ dependent ATPase activity helps in the transport of

• K+ inward, Na+ outward

• K+ inward only

• Na+ inward only

• K+ outward, Na+ inward

Stomata opens at night and closes during day in

• Xerophytes

• Gametophytes

• Mesophytes

• Hydrophytes

Guttation is caused due to

• Imbibition

• Osmosis

• Positive root pressure

• Transpiration

Which of the following is not a significance of transpiration?

• Absorption of water

• Absorption of minerals

• Cooling of leaf surface

• Maintains the shape and structure of plant

The bicuspid valve in the heart of mammal is situated between

• Left auricle and left ventricle

• Post caval and right caval

• Right auricle and left auricle

• Right ventricle and pulmonary aorta

Mammals are said to have a "double circulatory system this means

• That the blood vessels are paired

• That there are two types of blood vessels attached to every organ an artery and a vein

• That there are two system one from' the heart to the lungs and back to the heart, and

  the other to the heart from rest of the body

• That the blood circulated twice as quickly

Purkinje's fibres are special types of

• Muscle fibres located in the heart

• Nerve fibres located in the cerebrum

• Connective tissue fibres joining one bone to another bone

• Sensory fibres extending from retina into optic nerve

All of the Following are correct about human circulation EXCEPT

• Arteries have thick muscular walls

• The pacemaker of the heart is the SA node

• Leukocytes fight disease

• Hemoglobin carries oxygen

• The only artery carrying deoxygenated blood is the aorta

Which of the following correctly follows the flow of blood in the human body?

• Right ventricle—aorta—body—leftatrium—leftventricle—pulmonaryartery

• Right ventricle—pulmonaryartery—lungs—pulmonaryvein—leftatrium

• Left atrium—leftventricle—pulmonaryartery—pulmonaryvein—right atrium

• Left atrium—leftventricle—pulmonaryartery—lungs—pulmonaryvein—rightatrium

• Left ventricle—leftatrium—aorta—lungs—pulmonaryvein