Q1.Transport of water and mineral in plants take place through
Answer : Option CExplaination / Solution:
Transport of water and mineral in plant take place through xylem tissue present in vascular bundles. Vessels and tracheids are main water conducting elements of xylem.
Q2.Root hairs absorb water from soil with the help of
Answer : Option CExplaination / Solution:
Root hairs absorb water from soil with the help of suction pressure created due to concentration difference of water and mineral ions present in soil.
Q3.Some carrier proteins allow diffusion by both molecules cross the membrane in the same direction is
Answer : Option BExplaination / Solution:
Some carrier or transport proteins allow diffusion only if two types of molecules move together. In a symport, both molecules cross the membrane in the same direction.
Answer : Option DExplaination / Solution:
Movement by diffusionis passive, and may be from one part of the cell tothe other, or from cell to cell, or over short distances, say, from the intercellular spaces of the leaf to the outside.
Answer : Option BExplaination / Solution:
Diffusion rates are affected by the gradient of concentration, the permeability of the membrane separating them, temperature and pressure.
Q6.Proteins that form huge pores in the membrane of the certain organelles and bacteria are called as
Answer : Option AExplaination / Solution:
The porinsare proteins that form huge pores in the outer membranes of the plastids, mitochondria and some bacteria allowing molecules up to the size of small proteins to pass through.
Q7.The component that is essential to perform all physiological activities of the plant is
Answer : Option CExplaination / Solution:
Water is essential for all physiological activities of the plant and plays avery important role in all living organisms. It provides the medium in which most substances are dissolved.
Answer : Option CExplaination / Solution:
Diffusion pressure deficit is equal to osmotic pressure minus water potential. Higher the DPD more faster osmosis will occur.(DPD = OP – WP).
Q9.A and B are contiguous cells. A has OP=10 atm and TP= 7atm, B has OP=8atm, TP=3 atm, DPD= 5 atm. The result would be
Answer : Option DExplaination / Solution:
Two cells close to each other are called contiguous cells. Movement of water from one cell to other depends upon Diffusiion pressure deficit (DPD). DPD depends upon osmotic pressure and water pressure. So, movement of water from A to B will take place.
Q10.Which one will reduce the rate of transpiration?
Answer : Option CExplaination / Solution:
Transpiration takes place through stomata. Decrease in light intensity closes the stomata that ultimately results into reduction in rate of transpiration.
Total Question/Mark :
Scored Mark :
Mark for Correct Answer : 1
Mark for Wrong Answer : -0.5
Mark for Left Answer : 0