37. Leaf abscission is related with A). jasmonates. B). cytokinins. C). brassino
ID: 271413 • Letter: 3
Question
37. Leaf abscission is related with A). jasmonates. B). cytokinins. C). brassinosteroids. D). ethylene. E). auxins. 38. Animals in which the blastopore becomes the mouth are called A). stomates B). deuterostomes. D). prestomes C). protostomes E). Echinostomes 39. Blood cells that function to fight infection are called A). platelets. B) leukocytes. E). macrophages C) erythrocytes D). thrombocytes 40. How do crustaceans differ from the insects? A). Crustaceans have an exoskeleton made of chitin B) Crustaceans have legs in their abdomen and thorax. C). Crustaceans have jointed appendages D). Crustaceans are exclusively found in marine habitats E). Both A and C 41. The end result of the viral lytic cycle is A). lysis of the infected cell. B). immunity of the host cell to further viral infection C). the release of new viruses. D). both A and B. e. Both A and C 42. Gas exchange in plants occur through structures called A). Spiracles. C Aqua porins B). Gas pores. D. Stomata E). all of the choices. 43. Heart contraction is initiated by A). the superior vana cava C). an electrical impuise of appropriate intensity B). Purkinje fibers E). the bundle of His. D). sino atrial node.Explanation / Answer
Q37) Leaf abscission is related with -----
Answer- D- Ethylene, E- Auxin.
Explanation- Ethylene causes faster abscission of leaves and flowers. Auxin also helps in leaf and fruit abscission.
Brassinosteroids - promotes leaf senescence.
Cytokinin also plays an important role in leaf scenescence.
Jasmonate promotes ripening of fruit.
Q38) Animals in which blastopore becomes mouth are -------
Answer- C- protostomes.
Explanation- In protostomes blastopore becomes mouth first
In Deuterostomes Anal opening develops from Blastopore.
Q39) Blood cells that function to fight infection are called-
Answer- C- leukocytes.
Explanation- Leukocytes or WBC are the blood cells that plays a major role in the immune system , that is fighting against infection, Macrophages are cells made from WBC which also helps in immune system, Platelets and thrombocytes helps in blood clotting, Erythrocytes are RBC which helps in transportation of gases in body.
Q40) How do crustaceans differ from insects?
Answer- B- Crustaceans have legs in their abdomen and thorax.
Explanation- In Insects legs are found in thorax region, but in crustaceans they are found in thorax and abdomen.
Insects and Crustaceans both have backbone, jointed legs, have an exoskeleton made up of chitin, have segmented body.
Q41) The end result of Viral lytic cycle is ------
Answer- E- Both A & C
Explanation- At the end of lytic cycle, lysis of infected cell takes place and the newly formed viral particles come out. Viral DNA remains as a separate free floating molecule inside the bacterial cell, and replicates separately from the host bacterial DNA.
Q42) Gas exchange in plants occur through structures called----------
Answer- D-stomata.
Explanation- The exchange of oxygen and carbon dioxide in the leaf takes place by pores present on leaves called stomata.
Spiracles are found in insects for gas exchange.
Q43) heart contraction is initiated by --------
Answer- D- Sino Atrial Node.
Explanation- SA Node triggers heart contraction.
Superior venacavae returns deoxygenated blood from the systemic circulation to the right atrium of the heart.
Purkinje fibers carry the contraction impulse from both left and right bundle branch to the myocardium of the ventricles, helps in maintaining consistent rhythm of heart.
Bundle of HIS is a cardiac muscle fibre which passes from the atrioventricular node to the interventricular septum and then to the ventricles. It conducts the electrical impulses which regulate the heartbeat from the right atrium to the left and right ventricles.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.