Biology
Root hairs are the epidermal outgrowths of the outermost layer of roots. They are well-suited for absorption of water from soil due to which of the following features ?
P. Large surface area.
Q. Lower concentration of cell sap.
R. Semi permeable nature of the cell membrane.
- Only P
- Only Q
- Only P and Q
- Only P and R
Transport in Plants
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Answer
Only P and R
Reason — The root hairs are well-suited for absorption of water from soil due to their larger surface area, higher concentration of cell sap, and semi permeable nature of the cell membrane.
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Vinay has kept a small herbaceous plant in a test tube containing water. The surface of the water is covered by a layer of oil. After three hours, he observed that the level of water in the test tube has decreased. This is due to:
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Xylem tissue forms a tubular passage to transport water and mineral salts from the roots to the aerial parts of a plant. It consists of different types of cells.
P. Sieve tubes and companion cells
Q. Wood parenchyma and wood fibres
R. Tracheids and vesselsWhich of the following are xylem components?
- Only P
- Only P and R
- Only Q and R
- All P, Q and R
Assertion (A): Plants release carbon dioxide and water vapour as by products during the process of photosynthesis.
Reason (R): Plants utilize glucose as raw material in the process of photosynthesis which is a rich source of carbon dioxide and water.
- Both A and R are true.
- Both A and R are false.
- A is true and R is false.
- A is false and R is true.