Unit 2: Structural Organisation in Animals and Plants — Online MCQ Test
BIOLOGY · NEET (All) · NEET
Practice Unit 2: Structural Organisation in Animals and Plants with a free chapter-wise online MCQ test.
This chapter covers: Morphology and modifications; Tissues; Anatomy and functions of different parts of flowering plants: Root stem leaf inflorescence- cymose and recemose flower fruit and seed (To be....
AI-generated questions from basic to board-exam level, with instant results and explanations.
Unit 2: Structural Organisation in Animals and Plants — Important Questions & Answers
Identify the incorrect statement.
- A. Sapwood is involved in conduction of water and minerals from root to leaf.
- B. Sapwood is the innermost secondary xylem and is lighter in colour.
- C. Due to deposition of tannins, resins, oils etc., heart wood is dark in colour.
- D. Heart wood does not conduct water but gives mechanical support.
Answer: B. Sapwood is the innermost secondary xylem and is lighter in colour.
Sapwood is the outer (peripheral) secondary xylem, not the innermost. The innermost secondary xylem is the heartwood, which is physiologically inactive.
Sapwood is the outer (peripheral) secondary xylem, not the innermost. The innermost secondary xylem is the heartwood, which is physiologically inactive.
The transverse section of a plant shows the following anatomical features: Large number of scattered vascular bundles surrounded by bundle sheath. Large conspicuous parenchymatous ground tissue. Vascular bundles conjoint and closed. Phloem parenchyma absent. Identify the category of plant and its part.
- A. Monocotyledonous root
- B. Dicotyledonous stem
- C. Dicotyledonous root
- D. Monocotyledonous stem
Answer: D. Monocotyledonous stem
Scattered vascular bundles, absence of secondary growth (conjoint and closed bundles), and presence of bundle sheath are diagnostic characteristics of a monocotyledonous stem.
Scattered vascular bundles, absence of secondary growth (conjoint and closed bundles), and presence of bundle sheath are diagnostic characteristics of a monocotyledonous stem.
The ovary is half inferior in:
- A. Mustard
- B. Sunflower
- C. Plum
- D. Brinjal
Answer: C. Plum
Plum, rose, and peach have perigynous flowers where the ovary is half-inferior.
Plum, rose, and peach have perigynous flowers where the ovary is half-inferior.
The body of the ovule is fused within the funicle at:
- A. Micropyle
- B. Nucellus
- C. Chalaza
- D. Hilum
Answer: D. Hilum
The hilum is the junction where the ovule body attaches to the funicle.
The hilum is the junction where the ovule body attaches to the funicle.
Goblet cells of alimentary canal are modified from:
- A. Columnar epithelial cells
- B. Chondrocytes
- C. Compound epithelial cells
- D. Squamous epithelial cells
Answer: A. Columnar epithelial cells
Goblet cells are specialized columnar epithelial cells that secrete mucus.
Goblet cells are specialized columnar epithelial cells that secrete mucus.
The roots that originate from the base of the stem are:
- A. Primary roots
- B. Prop roots
- C. Lateral roots
- D. Fibrous roots
Answer: D. Fibrous roots
Fibrous root systems develop from the base of the stem and replace the primary root early in the plant's life (common in monocots).
Fibrous root systems develop from the base of the stem and replace the primary root early in the plant's life (common in monocots).
Which of the following is an example of a zygomorphic flower?
- A. Petunia
- B. Datura
- C. Pea
- D. Chilli
Answer: C. Pea
Zygomorphic flowers can be divided into two equal halves only in one plane, such as in Pea, Gulmohur, Bean, and Cassia.
Zygomorphic flowers can be divided into two equal halves only in one plane, such as in Pea, Gulmohur, Bean, and Cassia.
Root hairs develop from the region of
- A. Meristematic activity
- B. Maturation
- C. Elongation
- D. Root cap
Answer: B. Maturation
Root hairs are unicellular epidermal outgrowths that arise in the zone of maturation of the root, where cells have reached their final size and differentiation.
Root hairs are unicellular epidermal outgrowths that arise in the zone of maturation of the root, where cells have reached their final size and differentiation.
Which of the following features is used to identify a male cockroach from a female cockroach?
- A. Presence of a boat shaped sternum on the 9th abdominal segment
- B. Presence of anal cerci
- C. Forewings with darker tegmina
- D. Presence of caudal styles
Answer: D. Presence of caudal styles
Male cockroaches possess caudal styles (a pair of short, thread-like structures) on the 9th abdominal segment, which are absent in females. Anal cerci are present in both sexes. The boat-shaped sternum on the 7th segment is a female characteristic (for the brood pouch). Tegmina coloration is not a reliable sex differentiator.
Male cockroaches possess caudal styles (a pair of short, thread-like structures) on the 9th abdominal segment, which are absent in females. Anal cerci are present in both sexes. The boat-shaped sternum on the 7th segment is a female characteristic (for the brood pouch). Tegmina coloration is not a reliable sex differentiator.
Which of the following features is used to identify a male cockroach from a female cockroach?
- A. Presence of anal cerci
- B. Forewings with darker tegmina
- C. Presence of caudal styles
- D. Presence of a boat shaped sternum on the 9th abdominal segment
Answer: C. Presence of caudal styles
Male cockroaches can be distinguished from females by the presence of caudal styles (a pair of short, unjointed appendages) attached to the 9th abdominal segment. Both sexes have anal cerci. The boat-shaped (scaphoid) sternum is on the 9th abdominal segment in males but this is often described alongside styles; the key distinguishing feature cited in NCERT is the presence of anal styles in males.
Male cockroaches can be distinguished from females by the presence of caudal styles (a pair of short, unjointed appendages) attached to the 9th abdominal segment. Both sexes have anal cerci. The boat-shaped (scaphoid) sternum is on the 9th abdominal segment in males but this is often described alongside styles; the key distinguishing feature cited in NCERT is the presence of anal styles in males.