Q1. Transpiration is least in
(A) good soil moisture
(B) high wind velocity
(C) dry environment
(D) high atmospheric humidity.
Q2. Phenyl mercuric acetate (PMA) results in
(A) reduced photosynthesis
(B) reduced transpiration
(C) reduced respiration
(D) the killing of plants.
Q3. Stomata open and close due to
(A) circadian rhythm
(B) genetic clock
(C) the pressure of gases inside the leaves
(D) turgor pressure of guard cells.
Q4. Movement of leaves of sensitive plant, Mimosa pudica is due to
Q5. Phytochrome is involved in
Q6. Gibberellins promote
(A) seed germination
(B) seed dormancy
(C) leaf fall
(D) root elongation
Q7. Cut or excised leaves remain green for long if induced to root or dipped in
Q8. Hormone primarily connected with cell division is
(D) gibberellic acid
Q9. Carbon dioxide joins the photosynthetic pathway in
(A) PS I
(B) PS II
(C) light reaction
(D) dark reaction.
Q10. NADP+ is reduced to NADPH in
(A) PS I
(B) PS II
(C) Calvin cycle
(D) noncyclic photophosphorylation.
Q11. Minerals absorbed by root move to the leaf through
(C) sieve tubes
(D) none of the above.
Q12.Phosphorous and nitrogen ions generally get depeleted in soil because they usually occur as
(A) neutral ions
(B) negatively charged ions
(C) positively charged ions
(D) both positively and negatively charged but disproportionate mixture.
Q13. Which one is an essential mineral, not a constituent of any enzyme but stimulates the activity of many enzymes
Q14. Which one increases in the absence of light?
(A) uptake of minerals
(B) uptake of water
(C) elongation of internodes
(D) the ascent of sap.
Q15. Mowing grass lawn facilities better maintenance because
(A) wounding stimulates regeneration
(B) removal of apical dominance and stimulation of intercalary meristem
(C) removal of apical dominance
(D) removal of apical dominance and promotion of lateral meristem.
Q16. Leaf fall can be prevented with the help of
(a) abscisic acid
Q17. Which of the following hormones can replace vernalisation?
Q19. The substrate for photorespiration is
(A) phosphoglyceric acid
Q20. In C4 plants, the Calvin cycle operates in
(A) stroma of bundle sheath chloroplasts
(B) grana of bundle sheath chloroplasts
(C) grana of mesophyll chloroplasts
(D) stroma of mesophyll chloroplasts.