STD 12 - 3. reproductive health — NEET STD 11 Science — Question

All the following statements are correct about 'Saheli', but one is wrong. Which one is wrong?

Majority of sponges are

Liver and pancreas are derived from:

Which of the following statements are incorrect for neuron ?
(i) Neurons are excitable cells because their membranes are in a polarised state.
(ii) Different types of ion channels are present on the neural membrane.
(iii) Ion channels are selectively permeable to different ions.
(iv) When a neuron is not conducting any impulse the axonal membrane is comparatively less permeable to K⁺ and nearly impermeable to Na⁺.
(v) Resting membrane is impermeable to negatively charged proteins present in the axoplasm.
(vi) The ionic potential across the resting membrane are maintained by the active transport of ions by the sodium-potassium pump.
(vii) In sodium-potassium pump 2 Na⁺ transported outwards and 3 K⁺ into the cell.

The rate at which new born individuals are joining the population by reproduction is known as

Mendel conducted experiments for

During urine formation, the tubular cells secrete substance like ........... into the filterate.

Cartilage is formed by

Endocrine glands lack ducts and hence, called ductless glands. Their secretions are called hormones.
Choose correct characters of hormone.
(i) It is a chemical produced by endocrine glands.
(ii) It released into the blood and transported to a distantly located target organ.
(iii) Large number of chemicals act as hormones and provide coordination in the vertebrates.
(iv) Invertebrates possess very simple endocrine systems with few hormones.
(v) Hormones may be peptide, polypeptide, protein, steroids and amino acid derivatives.
(vi) Glucagon, cortisol, epinephrine and thyroid hormones are proteinaceous hormone.
(vii) Hormones are also secreted by some tissues which are not endocrine glands.