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Growth of pollen tube towards embryo sac is?

A
Chemotropic

B
Thigmotaxis

C
Geotropic

D
None of these

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Text SolutionText solutionverified iconVerified

The pollen tube paves its way through the solid part of the stigma and style by secreting pectinases and hydrolytic enzymes. Pollen tube travels inter-cellularly and chemotropically along the concentration gradient of calcium-boron-Inositol sugar complex.
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Question 1
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Determine the effects of a calcium deficiency on blood clotting.
  1. Calcium ions are necessary in both the intrinsic and extrinsic pathways to activate factor X. Calcium ions are required for the factors to associate with platelets in the platelet plug. The end result of both the intrinsic and extrinsic pathways is the same: activation of factor X to the active enzyme factor Xa. Without factor Xa, fibrin would not be formed in the common pathway and the platelet plug would not be "glued" together. Reactions in the common pathway also require calcium ions. Ultimately, coagulation is inhibited without calcium.
  2. Calcium ions are necessary in both the intrinsic and extrinsic pathways to activate factor XII. Calcium ions are required for the factors to associate with platelets in the platelet plug. The end result of both the intrinsic and extrinsic pathways is the same: activation of factor XII to the active enzyme factor Xa. Without factor Xa, fibrin would not be formed in the common pathway and the platelet plug would not be "glued" together. Reactions in the common pathway also require calcium ions. Ultimately, coagulation is inhibited without calcium.
  3. Calcium ions are necessary in both the intrinsic and extrinsic pathways to activate factor IX. Calcium ions are required for the factors to associate with platelets in the platelet plug. The end result of both the intrinsic and extrinsic pathways is the same: activation of factor IX to the active enzyme factor Xa. Without factor Xa, fibrin would not be formed in the common pathway and the platelet plug would not be "glued" together. Reactions in the common pathway also require calcium ions. Ultimately, coagulation is inhibited without calcium.
  4. None is correct!
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Question Text
Growth of pollen tube towards embryo sac is?
TopicPlant Growth and Development
SubjectBiology
ClassClass 11
Answer TypeText solution:1
Upvotes138