- Which pigment is responsible for the red, orange, and yellow coloration in leaves?
(A) Aldehydes
(B) Tannins
(C) Lignins
(D) Carotenoids
Ans: (D) Carotenoids - In which part of the cabbage plant is food stored?
(A) Leaves
(B) Stem
(C) Fruit
(D) Scurvy
Ans: (A) Leaves - What is the primary biological process through which plants reproduce?
(A) Pollination
(B) Condensation
(C) Consumption
(D) Evaporation
Ans: (A) Pollination - Plants that grow optimally in bright sunlight are known as:
(A) Sciophilous
(B) Xerophytes
(C) Heliophytes
(D) Epiphytes
Ans: (C) Heliophytes - Which plant hormone is mainly responsible for maintaining seed dormancy?
(A) Abscisic Acid
(B) Gibberellic Acid
(C) Indole Acetic Acid
(D) Ethylene
Ans: (A) Abscisic Acid - A fruit that develops from a multicarpellary apocarpous gynoecium is called:
(A) Composite
(B) Aggregate
(C) Simple
(D) Multiple
Ans: (B) Aggregate - What is the term for the winter dormancy period in animals?
(A) Aestivation
(B) Hibernation
(C) Regeneration
(D) Mutation
Ans: (B) Hibernation - Which of the following acts as the substrate in photorespiration?
(A) Fructose
(B) Pyruvic Acid
(C) Glycolate
(D) Glucose
Ans: (C) Glycolate - What is the first stable product formed during photosynthesis?
(A) Starch
(B) Sucrose
(C) Phosphoglyceric Acid (PGA)
(D) Glucose
Ans: (C) Phosphoglyceric Acid (PGA) - In which plant are dumb-bell-shaped guard cells found?
(A) Groundnut
(B) Gram
(C) Wheat
(D) Mango
Ans: (C) Wheat - How do plants release excess absorbed water?
(A) Evaporation
(B) Osmosis
(C) Diffusion
(D) Transpiration
Ans: (D) Transpiration - What physical force primarily enables roots to absorb water?
(A) Elasticity
(B) Capillarity
(C) Viscosity
(D) Photosynthesis
Ans: (B) Capillarity - Which plant part is mainly responsible for transpiration?
(A) Stem
(B) Leaves
(C) Roots
(D) All aerial parts
Ans: (B) Leaves - The corners of collenchyma cells thicken due to deposition of:
(A) Lignin and Suberin
(B) Suberin and Cutin
(C) Cellulose and Pectin
(D) Chitin and Lignin
Ans: (C) Cellulose and Pectin - The sudden folding of leaves in the “Touch-me-not” plant is an example of:
(A) Photonasty
(B) Nyctinasty
(C) Seismonasty
(D) Chemonasty
Ans: (C) Seismonasty - Kidney-shaped guard cells are typically seen in:
(A) Dicot Plants
(B) Monocot Plants
(C) Both A and B
(D) Algae
Ans: (A) Dicot Plants - In cacti, the spines are modified forms of:
(A) Stems
(B) Stipules
(C) Leaves
(D) Buds
Ans: (C) Leaves - What causes the stomata to open?
(A) Exosmosis
(B) Endosmosis
(C) Plasmolysis
(D) Low Cell Sap Concentration
Ans: (B) Endosmosis - 2,4-D is widely used as a:
(A) Weedicide
(B) Vitamin
(C) Fertilizer
(D) Insecticide
Ans: (A) Weedicide - The liquid inside a coconut is actually:
(A) Liquid Nucellus
(B) Liquid Mesocarp
(C) Liquid Endocarp
(D) Degenerated Liquid Endosperm
Ans: (D) Degenerated Liquid Endosperm