Opening and closing of stomata is controlled by
abscisic acid
CO2 concentration
O2 concentration
light intensity
A.
abscisic acid
B.
CO2 concentration
D.
light intensity
Opening and closing of stomata depends upon the turgidity of guard cells. When the plant has excessive water, the guard cells are turgid and stomata opens. It also depends on CO2 concentration. When CO2 concentration is low is photosynthetic parenchyma, stomata open to absorb more gas. Also as the luminosity increases, the rate of photosynthesis also increases leading to stomatal opening.
ABA or Abscisic Acid is a stress hormone that during water stress conditions induces stomatal closing.
Which of the following statements is/are correct for transduction?
It is observed in Gram positive and Gram negative bacteria.
Bacteria should be in state of competence
Transfer of DNA by a bacteriophage takes place.
Packaging of both host and phage DNA takes place
Each 100 mL of human arterial blood carries 'P' mL of O2 and 'Q' mL of CO2, whereas each 100 mL of venous blood carries 'R' mL of O2 and 'S' mL of CO2. Choose the correct values of P, Q, R and S.
P =48 mL; Q=19 - 20 mL; R=52 mL; S = 14 - 15 ml
P= 19 - 20mL; Q= 48 mL; R= 14 - 15mL; S =52 mL
P = 14 - 15mL; Q = 52mL; R = 19 - 20 mL; S = 48mL
P = 52 mL; Q =14 - 15mL; R = 48 mL; S = 19 - 20 mL
Intrinsic and extrinsic pathways of blood clotting are interlinked at the activation steps of which of the following factors?
Factor IX
Factor IV
Factor X
Factor XIIIa
Which of the following statements is/are correct regarding the effects of pH on enzyme catalysed reactions?
Direction of the reaction is influenced by [H+]
Ionisation state of dissociating groups on the enzyme is modified
Ionisation state of the substrate is modified.
Protein is not denatured with the change in pH
Select the correct combination (s) from the following
Gir - Asiatic Lion
Sunderbans - Rhinoceros
Periyar - Indian Elephant
Corbet National Park - Red Panda
Which of the following pairs of cranial nerves is/are of mixed category?
Glossopharyngeal and hypogrossal
Trigeminal and abducens
Trigeminal and facial
Glossopharyngeal and vagus
The usual cause (s) of peptic ulceration is/are
lower rate of secretion of gastric juice
higher rate of secretion of gastric and duodenal juices
improper neutralisation of gastric juice by duodenal juices
imbalance between the rate of secretion of gastric juice and the degree of protection offered by gastro-duodenal mucosa
Match the following column I with column II
| Column I | Column II |
| A. Vitamin- B1 | 1. Accumulation of fat |
| B. Gastric juice | 2. Loss of fat |
| C. Starvation | 3. Pepsin |
| D. Obesity | 4. Beri- beri |
A- 3; B- 4; C- 2; D- 1
A- 3; B- 4; C- 1; D- 2
A- 4; B- 3; C- 1; D- 2
A- 4; B- 2; C- 1; D- 3
