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In seed plants and the ferns, the parenchymatous region in the stem is devoid of vascular elements, but the region is limited to only a short distance up, beyond which the vascular tissue is present. These parenchymatous regions in the vascular cylinder are described as
Two involute gears are designed to mesh for a given centre distance and a given angular velocity ratio (other than 1). During assembly, the centre distance has increased slightly. Then which of the following changes occur? (i) Velocity ratio changes (ii) Pressure angle changes (iii) Pitch circle diameter changes (iv) Working depth changes (v) Base circle radius changes Select the correct answer using the code given below.
After photoisomerization of the retinal molecule, which amino acid residue becomes a proton acceptor of the donor proton from the retinal molecule?
In the mechanism of vision, cis-retinal is converted into trans-retinal.
Mundel's classes of change includes
1. Changes in body motions and positions
2. Changes in equipment and working arrangements
3. Changes in production sequence
4. Changes in finished product
5. Changes in raw material
Given below are animals having Blood Vascular System. Select the animals which have CLOSED Blood Vascular System. A. Hippocampus B. Pheretima C. Pila D. Periplaneta
Part of the vascular strand of the leaf which is present in the stern as a lower portion of the vascular supply to the leaf is called the
In the monocots the vascular cylinder consists of widely scattered network of vascular bundles. Such a stele is called
In Phlox, the vascular cylinder is continuous and consists of a single layered pericycle, a complete ring of phloem, a complete ring of cambium and a complete cylinder of xylem with a pith in the centre. This arrangement of the vascular tissue is called
Match the following: a. Whiptail disease  i. Potato  b. Dieback disease ii. Cauliflower  c. Khaira disease  iii. Citrus d. Early blight disease  iv. Rice