The pigment responsible for the orange color in carrots is:
A. Lycopene
B. Xanthophyll
C. Beta-carotene
D. Chlorophyll
Answer: Option C
Solution (By JKExamLibrary)
Beta-carotene is a precursor of vitamin A (provitamin A) and imparts an orange color to carrots, pumpkins, and sweet potatoes. Lycopene gives red color to tomatoes, chlorophyll is green, xanthophyll is yellow. Beta-carotene is an antioxidant and is important for vision and immune function.
Explanation:
The thalamus, a paired structure in the diencephalon, processes and relays sensory information (except olfaction) to the cerebral cortex. It also regulates consciousness and alertness. The cerebellum coordinates movement, hypothalamus maintains homeostasis, medulla controls vital reflexes.
Consider the following statements about the nervous system:
1. Motor neurons carry impulses from the CNS to effectors.
2. Sensory neurons carry impulses from receptors to the CNS.
3. Interneurons are found only in the peripheral nervous system.
Which of the above is/are correct?
Assertion (A): The large central vacuole in plant cells helps maintain turgor pressure.
Reason (R): It stores water and solutes, creating osmotic pressure that pushes the cytoplasm against the cell wall.
A.A false, R true.
B.A true, R false.
C.Both A and R are true, and R is the correct explanation.
D.Both A and R are true, but R is not the correct explanation.
Explanation:
The vacuole’s solute concentration draws water, generating turgor pressure that maintains cell rigidity. This is essential for support in plants. R explains A.
No comments yet. Be the first to start the discussion!