ICSE/ISC Plus 2 Biology Science Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in

Question-1
Stomata of a plant open due to:-

(A) influx of calcium ions	(B) Influx of potassium ions
(C) efflux of potassium ions	(D) influx of hydrogen ions

Question-2
A plant requires magnesium for

(A) holding cells together	(B) protein synthesis
(C) chlorophyll synthesis	(D) cell wall development.

Question-3
Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing micro-organisms?

(A) Casuarina equisetifolia	(B) Crotalaria juncea
(C) Cycas revoluta	(D) Cicer arietinum

Question-4
Boron in green plants assists in

(A) sugar transport	(B) activation of enzymes
(C) acting as enzyme cofactor	(D) photosynthesis

Question-5
Gray spots of oat are caused by deficiency of

(A) Fe	(B) Cu
(C) Zn	(D) Mn

Question-6
Which one of the following elements is not an essential micronutrient for plant growth ?

(A) Mn	(B) Zn
(C) Cu	(D) Ca

Question-7
Amino acids are mostly synthesized from

(A) mineral salts	(B) fatty acids
(C) volatile acids	(D) α- ketoglutaric acid

Question-8
Choose the correct match:- Bladderwort, sundew, venusfly trap

(A) Nepenthes, Dionea, Drosera	(B) Nepenthes, Utricularia, Vanda
(C) Utricularia, Drosera, Dionea	(D) Dionea, Trapa, Vanda

Question-9
The major portion of the dry weight of plants comprises of

(A) carbon, hydrogen, and oxygen.	(B) nitrogen, phosphorus and potassium
(C) calcium, magnesium and sulphur	(D) carbon, nitrogen and hydrogen.

Question-10
Zinc as a nutrient is used by the plants in the form of :-

(A) Zn	(B) Zn²⁺
(C) ZnO	(D) ZnSO₄

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