Which gas do green plants absorb during photosynthesis? a) Nitrogen b) Carbon dioxide c) Carbon monoxide d) Oxygen Ans: b) Carbon dioxide
Why does it feel cooler under a tree than under a tin shed on a sunny day? a) The greenery of the tree provides coolness b) Photosynthesis absorbs heat c) Leaves convert vapour to water absorbing heat d) Leaves release water, which evaporates absorbing latent heat Ans: d) Leaves release water, which evaporates absorbing latent heat
🌳 Plant Structure and Physiology
When the bark of a tree is removed in a circular strip around the base, the tree dies because: a) Water from soil can’t reach the aerial parts b) Roots are deprived of energy c) Tree gets infected by microbes d) Roots don’t receive oxygen Ans: a) Water from soil can’t reach the aerial parts
Water is transported in vascular plants through: a) Phloem b) Parenchyma c) Meristems d) Xylem Ans: d) Xylem
Which part of a plant receives stimulus for flowering? a) Stem b) Branches c) Leaves d) Roots Ans: c) Leaves
Which part of the ovule lies opposite the micropyle and represents the basal region? a) Hilum b) Funicle c) Chalaza d) Nucellus Ans: c) Chalaza
🌱 Plant Reproduction and Growth
A plant bud is best described as: a) An embryonic shoot b) An embryonic leaf c) An embryonic stem d) A seed Ans: a) An embryonic shoot
The axillary bud develops into: a) Fruit b) Leaf c) Branch d) Root Ans: c) Branch
The seeds of flowering plants consist of: a) Ovary and ovary wall b) Embryo, food storage, and seed coat c) Cotyledons d) Zygote Ans: b) Embryo, food storage, and seed coat
All plants produced from a single parent through vegetative propagation are called: a) Clones b) Pure lines c) Inbred lines d) Pedigree lines Ans: a) Clones
🌾 Plant Diseases and Crop Matching
Rust disease in wheat is caused by: a) Fungi b) Virus c) Hormonal imbalance d) Bacteria Ans: a) Fungi
Match the crops with their respective diseases:
A. Paddy – 2. Blast
B. Wheat – 4. Rust
C. Mustard – 1. Downy mildew
D. Sugarcane – 3. Red rot Correct Code: b) 2, 4, 1, 3
🌾 Agricultural and Economic Importance
India is the largest producer and exporter of: a) Tea b) Coffee c) Wheat d) Rice Ans: a) Tea
🌸 Fruits, Seeds, and Modifications
Which of the following is a modified stem? a) Carrot b) Sweet potato c) Coconut d) Potato Ans: d) Potato
Fruits of which plant are found underground? a) Potato b) Carrot c) Groundnut d) Onion Ans: c) Groundnut
Which plants grow in saline soils? a) Xerophytes b) Hydrophytes c) Halophytes d) Succulents Ans: c) Halophytes
🌿 Plant Biochemistry and Miscellaneous
The main flavor component in apples is due to: a) Formalin b) Benzene c) Ethanal d) Benzaldehyde Ans: c) Ethanal
Which compound is used as a rodenticide? a) Zinc phosphide b) Zinc carbonate c) Zinc chloride d) Zinc sulphide Ans: a) Zinc phosphide
What are considered the “lungs” of a plant? a) Leaves b) Stems c) Flowers d) Roots Ans: a) Leaves
