Which one of the following sets of ions is necessary in the chemical events for muscle contraction?
Options
(a) Na⁺ and K⁺ (b) Na⁺ and Ca⁺⁺ ions (c) Na⁺ and Mg⁺⁺ ions (d) […]
The outer layer of vacuole is called
Options
(a) cell wall (b) plasmolayer (c) tonoplast (d) leucoplast
Correct Answer:
tonoplast
Explanation:
No explanation available. Be the first to write the explanation for this […]
Passage of materials to and from the cells is carried out by…… and active transport. Fill in the blanks with a suitable option given below
Options
(a) facilitated diffusion (b) osmosis (c) passive […]
Movement of touch is called
Options
(a) lithotropism (b) thigmotropism (c) phototropism (d) thermotropism
Correct Answer:
thigmotropism
Explanation:
Thigmotropism is a directional curvature movement of growth which is produced in response to the […]
In plants, water supply is due to
Options
(a) osmosis (b) imbibition (c) guttation (d) adhesion force
Correct Answer:
osmosis
Explanation:
Root hairs function as tiny osmotic systems. Each root hair has a thin […]
If the cell of root in wheat plant have 42 chromosomes then the number of chromosome in the cells of pollen grain
Options
(a) 14 (b) 28 (c) 21 (d) 42
Correct Answer: […]
When pollen tube enters into the ovule by integument, it is called
Options
(a) dicliny (b) herkogamy (c) chalazogamy (d) mesogamy
Correct Answer:
mesogamy
Explanation:
No explanation available. Be the first to write […]
Which is the part of female reproductive system?
Options
(a) anther (b) embryo sac (c) stamen (d) all of these
Correct Answer:
embryo sac
Explanation:
No explanation available. Be the first to write […]
Which one of the following is male gametes?
Options
(a) megasporangium (b) embryo sac (c) microspore (d) antipodal cell
Correct Answer:
microspore
Explanation:
No explanation available. Be the first to write the explanation […]
When acetone reacts with bleaching powder, the compound formed is
Options
(a) CCl₄ (b) CHCl₃ (c) CH₃CHO (d) CH₃COOH
Correct Answer:
CHCl₃
Explanation:
It involves two steps: CaOCl₂(Bleaching powder) + H₂O → Ca(OH)₂ […]
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