) a. pulling it upward b. pulling and pushing it, respectively d. cell division, cell maturation, cell enlargement, root cap .
The cells of the quiescent centre are characterized by (CBSE -AIPMT ) a. having dense cytoplasm and prominent nucleus b. having light cytoplasm and small nucleus c. dividing regularly to add to the corpus d.
dividing regularly to add to tunica . P. Protein is found in (CBSE- AIPMT ) a. parenchyma b.
collenchyma c. sieve tube d. xylem . Specialized epidermal cells surrounding the guard cells are called (NEET (I) ) a.
bulliform cells b. lenticels c. complementary cells d. subsidiary cells Directions: The following questions & consist of two statements, one labelled Assertion and the another labelled Reason .
Select the correct answer from the codes given below: a) Both assertion and reason are true and reason is the correct explanation of assertion b) Both assertion and reason are true, but reason is not the correct explanation of assertion c) Assertion is true but reason is false d) Assertion and reason are false . Assertion: Conducting tissues, especially xylem show greatest reduction in submerged hydrophytes. Reason: Hydrophytes live in water. So no need of tissues.
(AIIMS – ) Ans: c. . Assertion: Long distance flow of photo assimilates in plants occurs through sieve tubes. Reason: Mature sieve tubes have partial cytoplasm and perforated sieve plates (AIIMS – ) Ans: a.
. Duramen is present in (JIPMER ) a. the inner region of secondary wood b. a part of sap wood c.
the outer region of secondary wood d. region of pericycle . The interxylary phloem is found in the stem of (JIPMER ) a. Cucurbita b.
Salvia c. Calotropis d. none of these . Carrier proteins are involved in (PMT- UP- ) a.
Active transport of ions b. Passive transport of ions c. Water transport d. Water evaporation .
Active transport of ions in the cell requires (PMT MP ) a. High temperature b. ATP c. Alkaline pH d.
Salts . Guttated liquid is (AFMC ) a. Pure water b.