Plant kingdom: algae, bryophytes, pteridophytes, gymnosperms
- Which of the following statements is *correct* ? Answer: 1. Ovules are not enclosed by ovary wall in gymnosperms. Gymnosperms are 'naked-seeded' plants, so their ovules lie exposed and are... 1
- Zygotic meiosis is characteristic of : Answer: 3. textitChlamydomonas In zygotic meiosis the zygote divides by meiosis first, so the plant body is haploid. This is the haplontic l... 1
- Select the mismatch : Answer: 4. textitPinus - Dioecious The mismatch is Pinus - dioecious. Pinus is monoecious: male and female cones are on the same tree. Cycas... 1
- Life cycle of Ectocarpus and Fucus respectively are : Answer: 2. Haplodiplontic, Diplontic Ectocarpus is a brown alga with alternation of generations, so its life cycle is haplodiplontic. Fucus... 1
- An example of colonial alga is : Answer: 1. Volvox Key idea: Colonial algae have a fixed number of cells living together as one unit. Volvox forms a spherical colony of many... 1
- Conifers are adapted to tolerate extreme environmental conditions because of Answer: 2. thick cuticle Conifers grow in cold, dry conditions. A thick cuticle and sunken stomata, with needle-like leaves, reduce water lo... 1
- Which one of the following statements is wrong ? Answer: 1. Algin is obtained from red algae, and carrageenan from brown algae. The statement is reversed. Algin comes from brown algae and c... 1
- Select the correct statement: Answer: 3. Sequoia is one of the tallest trees Sequoia (the redwood, a gymnosperm) is among the tallest trees, so option 3 is correct. 1: Gy... 1
- In bryophytes and pteridophytes, transport of male gametes requires : Answer: 4. Water In bryophytes and pteridophytes the male gametes (antherozoids) are flagellated and swim through water to reach the egg, so... 1